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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Environ. Sci.</journal-id>
<journal-title>Frontiers in Environmental Science</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Environ. Sci.</abbrev-journal-title>
<issn pub-type="epub">2296-665X</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="publisher-id">1617829</article-id>
<article-id pub-id-type="doi">10.3389/fenvs.2025.1617829</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Environmental Science</subject>
<subj-group>
<subject>Original Research</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Study on dynamic changes in land use and ecosystem service value in the Huaihe River ecological economic belt based on multi-scenario simulations</article-title>
<alt-title alt-title-type="left-running-head">Li et al.</alt-title>
<alt-title alt-title-type="right-running-head">
<ext-link ext-link-type="uri" xlink:href="https://doi.org/10.3389/fenvs.2025.1617829">10.3389/fenvs.2025.1617829</ext-link>
</alt-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Li</surname>
<given-names>Changai</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
<role content-type="https://credit.niso.org/contributor-roles/Writing - review &#x26; editing/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Wu</surname>
<given-names>Yong</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Qiu</surname>
<given-names>Bing</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Li</surname>
<given-names>Yaliang</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Ning</surname>
<given-names>Lili</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Wang</surname>
<given-names>Hui</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
</contrib>
<contrib contrib-type="author" corresp="yes">
<name>
<surname>Liu</surname>
<given-names>Ling</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="corresp" rid="c001">&#x2a;</xref>
<uri xlink:href="https://loop.frontiersin.org/people/3046897/overview"/>
<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
<role content-type="https://credit.niso.org/contributor-roles/Writing - review &#x26; editing/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Ma</surname>
<given-names>Jin</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
</contrib>
</contrib-group>
<aff id="aff1">
<sup>1</sup>
<institution>School of Biological Engineering</institution>, <institution>Huainan Normal University</institution>, <addr-line>Huainan</addr-line>, <country>China</country>
</aff>
<aff id="aff2">
<sup>2</sup>
<institution>First Exploration Team of Anhui Coalfield Geological Bureau</institution>, <addr-line>Huainan</addr-line>, <country>China</country>
</aff>
<aff id="aff3">
<sup>3</sup>
<institution>Department of Landscape Architecture</institution>, <institution>Nanjing Forestry University</institution>, <addr-line>Nanjing</addr-line>, <country>China</country>
</aff>
<author-notes>
<fn fn-type="edited-by">
<p>
<bold>Edited by:</bold> <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/2880631/overview">Eduardo Gomes</ext-link>, University of Lisbon, Portugal</p>
</fn>
<fn fn-type="edited-by">
<p>
<bold>Reviewed by:</bold> <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/2169120/overview">Lei Wang</ext-link>, Beijing Academy of Agricultural and Forestry Sciences, China</p>
<p>
<ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/3075454/overview">Ying Liu</ext-link>, Tianjin University, China</p>
</fn>
<corresp id="c001">&#x2a;Correspondence: Ling Liu, <email>bewf15@163.com</email>
</corresp>
</author-notes>
<pub-date pub-type="epub">
<day>08</day>
<month>07</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="collection">
<year>2025</year>
</pub-date>
<volume>13</volume>
<elocation-id>1617829</elocation-id>
<history>
<date date-type="received">
<day>28</day>
<month>04</month>
<year>2025</year>
</date>
<date date-type="accepted">
<day>18</day>
<month>06</month>
<year>2025</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#xa9; 2025 Li, Wu, Qiu, Li, Ning, Wang, Liu and Ma.</copyright-statement>
<copyright-year>2025</copyright-year>
<copyright-holder>Li, Wu, Qiu, Li, Ning, Wang, Liu and Ma</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/">
<p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</p>
</license>
</permissions>
<abstract>
<p>This research investigated the changes of land use as well as ecosystem service value (ESV) of the Huaihe River Ecological Economic Belt (HREEB) which is a critical ecological functional zone in China. This research utilised land-use data to analyse the spatiotemporal dynamics of land-use patterns of the HREEB. The patch-generating land-use simulation model was utilized to simulate land-use patterns under three distinct scenarios for the year 2030. The ESV was quantified using the equivalent factor method. Furthermore, Pearson correlation analysis and the geographic detector model were employed to examine the impacts of factors on the ESV. The results showed that (1) From 2000 to 2020, farmlands predominated as the primary land-use type, followed by artificial surfaces, forests and water bodies. The most notable land-use trend was the conversion of farmlands into artificial surfaces. (2) Between 2000 and 2005, the overall ESV rose, but from 2005 to 2020, it decreased. By 2030, the ESV under the ecological protection scenario would higher than other scenarios (3) Land-use types (espacially water bodies and artifical surfaces), NDVI and soil type were identified as the crucial drivers of ESV variation. Thus, our results can offers considerable theoretical insights for formulating environmental conservation and land-use strategies for the region.</p>
</abstract>
<kwd-group>
<kwd>land use</kwd>
<kwd>ESV</kwd>
<kwd>patch-generating land-use simulation</kwd>
<kwd>geographic detector</kwd>
<kwd>HREEB</kwd>
</kwd-group>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Land Use Dynamics</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec id="s1">
<title>1 Introduction</title>
<p>Ecosystem services encompass a wide array of immediate and collateral advantages that people obtain from natural environments (<xref ref-type="bibr" rid="B15">Hasan et al., 2020</xref>; <xref ref-type="bibr" rid="B53">Xia et al., 2023</xref>), including climate regulation, environmental remediation, soil conservation, resource provisioning and landscape aesthetic maintenance (<xref ref-type="bibr" rid="B26">Lin et al., 2023</xref>; <xref ref-type="bibr" rid="B39">Sannigrahi et al., 2020</xref>). A healthy ecosystem exhibits resilience in maintaining its structure, functionality and service provision under external pressures, without displaying evident signs of stress (<xref ref-type="bibr" rid="B17">Hern&#xe1;ndez-Blanco et al., 2022</xref>). Ecosystem services are not only indicative of ecosystem health but are also intrinsically linked to human wellbeing, serving as a critical foundation for sustainable socioeconomic development (<xref ref-type="bibr" rid="B8">Costanza et al., 2014</xref>). Nevertheless, rapid global economic growth and continuous population expansion have intensified human disturbances to natural ecosystems, resulting in widespread issues, including land degradation, vegetation cover reduction, water body area shrinkage and construction-land expansion (<xref ref-type="bibr" rid="B22">Li et al., 2020</xref>; <xref ref-type="bibr" rid="B45">Valle Junior et al., 2015</xref>). These changes have exacerbated ecological degradation, profoundly affecting regional biodiversity and socioeconomic activities (<xref ref-type="bibr" rid="B7">Ci et al., 2023</xref>). Over the past half-century, ecosystem services have significantly degraded in many regions (<xref ref-type="bibr" rid="B1">Bateman et al., 2013</xref>; <xref ref-type="bibr" rid="B10">Fang et al., 2021</xref>). Accordingly, the determination of ecosystem service value (ESV) has been a pivotal study hotspot in ecological and environmental sciences (<xref ref-type="bibr" rid="B5">Chen W. et al., 2021</xref>; <xref ref-type="bibr" rid="B46">Wang et al., 2014</xref>). The ESV quantifies the economic value of ecosystem services by translating them into monetary or commodity terms, offering a robust framework for understanding their dynamics and informing ecological conservation policies and sustainable development strategies (<xref ref-type="bibr" rid="B27">Liu et al., 2010</xref>; <xref ref-type="bibr" rid="B38">Sannigrahi et al., 2018</xref>).</p>
<p>Land-use change (LUC) is a primary driver of alterations in ecosystem service functions (<xref ref-type="bibr" rid="B48">Wang Y. et al., 2023</xref>). Consequently, analysing the dynamic variation of ESV based on LUC is a widely adopted research approach (<xref ref-type="bibr" rid="B29">Liu et al., 2020</xref>). Notably, ESV evaluations must consider the pronounced spatiotemporal dynamics of land-use patterns (<xref ref-type="bibr" rid="B18">Hu et al., 2019</xref>; <xref ref-type="bibr" rid="B52">Winkler et al., 2021</xref>). Early research primarily focused on elucidating the historical spatiotemporal dynamics of the ESV, while recent studies have increasingly emphasised on predicting future ESV trends through land-use simulations (<xref ref-type="bibr" rid="B35">Peng et al., 2021</xref>). Current methodologies for land-use simulations include the cellular automata (CA)&#x2013;Markov model (<xref ref-type="bibr" rid="B14">Guan et al., 2019</xref>), conversion of land use and its effects (CLUE-S) model (<xref ref-type="bibr" rid="B34">Peng et al., 2019</xref>), future land-use simulation (FLUS) model (<xref ref-type="bibr" rid="B6">Chen Z. et al., 2021</xref>) and patch-generating land-use simulation (PLUS) model (<xref ref-type="bibr" rid="B50">Wang et al., 2024</xref>). Among them, the PLUS model has superior simulation accuracy, enabling the precise quantification of the contributions of driving factors to LUC (<xref ref-type="bibr" rid="B25">Liang et al., 2021</xref>).</p>
<p>Among these methods that are widely employed for calculating the ESV, the equivalent factor method is particularly suitable for regional and national-scale ESV assessments because of its intuitive nature and operational simplicity (<xref ref-type="bibr" rid="B5">Chen W. et al., 2021</xref>; <xref ref-type="bibr" rid="B46">Wang et al., 2014</xref>). Building on the foundational work of <xref ref-type="bibr" rid="B8">Costanza et al. (2014)</xref> and <xref ref-type="bibr" rid="B51">Xie et al. (2015)</xref> developed a method for determining ESV equivalent factors that was grounded in experts&#x2019; knowledges. This method not only quantifies the service values of diverse ecosystems but also captures the spatiotemporal dynamics of the ESV. To further enhance ESV calculation accuracy, scholars have refined the equivalent factors of ESV using region-specific parameters, such as grain yield, rainfall, normalised difference vegetation index (NDVI) (<xref ref-type="bibr" rid="B11">Fu et al., 2016</xref>; <xref ref-type="bibr" rid="B32">Niu et al., 2022</xref>; <xref ref-type="bibr" rid="B55">Xie et al., 2015</xref>).</p>
<p>Recently, research examining the effects of LUC on the ESV has increased, primarily targeting areas of significant economic growth and ecological sensitivity, such as the Yangtze River Delta (<xref ref-type="bibr" rid="B24">Li et al., 2019</xref>), Xinjiang (<xref ref-type="bibr" rid="B47">Wang et al., 2022</xref>) and the Qinghai&#x2013;Tibet Plateau (<xref ref-type="bibr" rid="B19">Jiang et al., 2020</xref>). By contrast, the Huai River Basin, which is one of the cradles of Chinese civilisation, has received lesser attention. The Huaihe River Ecological Economic Belt (HREEB) has a superior geographical location. It is not only a transitional zone between the north and south of China, but also a transitional zone between subtropical monsoon climate and warm temperate climate. Therefore, it has rich biodiversity and profound cultural heritage. However, the distribution of rainfall throughout the year is uneven, making it prone to flooding and drought. The carrying capacity of water and soil resources is limited, and the ecological environment capacity is inhibited. As a region of ecological importance and vulnerability in China, the ecological service functions of this area play an important role in building an important ecological corridor for the transition zone between the north and south climates, improving the overall natural environment, and maintaining national ecological security. The HREEB serves not only as a crucial ecological barrier for China but also ranks among the most promising regions for development in the central-eastern portion of the nation. However, prolonged neglect has led to numerous challenges in the region, such as lagging economic growth and severe environmental degradation. In response, the Development Plan for the Huaihe River Ecological Economic Belt, which outlined comprehensive strategies to protect the area&#x2019;s natural ecosystems and service functions, was issued in 2018. Consequently, research on land use and ESV in this region carries multi-faceted significance. From an ecological perspective, investigating how LUC affect climate regulation, hydrological processes, soil conservation and biodiversity can provide scientific foundations for establishing regional ecological security patterns. On the economic front, incorporating ecological values into development assessments facilitates green GDP accounting and promotes the transition from traditional industries to eco-friendly industries. At the social level, understanding the encroachment of cities on ecological spaces is beneficial for mediating urban-rural conflict. Regarding policy implications, the research outcomes can inform spatial planning and enhance inter-provincial collaborative governance, ensuring alignment with national strategic objectives. Collectively, this study holds substantial practical value for the region&#x2019; development.</p>
<p>The existing research on the ESV of the HREEB mainly took 10&#xa0;years as a cycle (<xref ref-type="bibr" rid="B49">Wang Z. et al., 2023</xref>), while China&#x2019;s development plan takes 5&#xa0;years as a cycle. Using 10&#xa0;years as a cycle often overlooked some valuable development laws and characteristics. The existing research on the driving factors of ESV in the HREEB was limited to using the correlation coefficient to analyze the relationship of landscape index and ESV, without considering the comprehensive effects of multiple driving factors on ESV at the spatial level. In addition, the main sources of grain planting area and yield data used to correct the ESV equivalent factor were often not detailed (<xref ref-type="bibr" rid="B49">Wang Z. et al., 2023</xref>). Against this backlog, this study took 5&#xa0;years as a cycle to analyse the ESV and predict land-use patterns for 2030 in the HREEB. By applying Pearson correlation analysis and a geographic detector model, the study explored the spatial driving factors underlying the ESV variation. The main grain planting area and yield data of each city and county in the region were obtained. Some data that were not recorded in history were also replaced with reliable data, and the data sources were explained in detail to ensure that the research results were more scientific. The results offer a scientific basis for the creation of environmental conservation policies and strategic land management plans, and the layout of green industries, achieving coordinated economic and ecological development, and ultimately promoting high-quality regional development and ecological civilization construction.</p>
</sec>
<sec sec-type="materials|methods" id="s2">
<title>2 Materials and methods</title>
<sec id="s2-1">
<title>2.1 Study area</title>
<p>In 2018, the National Development and Reform Commission defined the HREEB area as encompassing regions along the trunk stream of the Huai River, its primary tributaries as well as the downstream Yishu&#x2013;Sishui River system. This region spans five provinces&#x2014;Jiangsu, Shandong, Anhui, Henan and Hubei&#x2014;and includes 25 prefecture-level cities, three counties (Tongbai, Suixian and Dawu) and 1 county-level city (Guangshui). The mean yearly temperature in the region is recorded at 13.7&#xb0;C, while the mean annual precipitation amounts to 992.88&#xa0;mm. The geographic location of the HREEB is illustrated in <xref ref-type="fig" rid="F1">Figure 1</xref>.</p>
<fig id="F1" position="float">
<label>FIGURE 1</label>
<caption>
<p>Geographic location of the HREEB.</p>
</caption>
<graphic xlink:href="fenvs-13-1617829-g001.tif">
<alt-text content-type="machine-generated">Map illustrating the Huaibei River Ecological Economic Belt in China, covering provinces Shandong, Henan, Anhui, Jiangsu, and Hubei. The main map shows elevation data with a gradient from red (high) to blue (low), detailing cities and counties such as Xinyang, Linyi, and Yangzhou. Small inset maps provide regional context within China, with coordinates indicated.</alt-text>
</graphic>
</fig>
</sec>
<sec id="s2-2">
<title>2.2 Data sources</title>
<p>The land-use data for the 2000&#x2013;2020 period, which boasts a spatial resolution of 30&#xa0;m, were obtained from a dataset developed by Yang and Huang et al. of Wuhan University (<xref ref-type="bibr" rid="B57">Yang and Huang, 2021</xref>). Seven land-use types were included in the dataset: farmland, forest, shrubland, grassland, water body, barren land and artificial surfaces. Due to the unavailability of yield per unit area data of wheat, rice and corn for Suixian County, Guangshui City and Dawu County, the yield per unit area data of the Hubei were adopted. Other data sources are shown in <xref ref-type="table" rid="T1">Table 1</xref> For the PLUS model, all vector data were converted into raster format, with the spatial coordinate system standardised to WGS 1984 Pseudo-Mercator and a uniform resolution of 30&#xa0;m. Similarly, for the geographic detector model, the vector data were rasterised, and the spatial coordinate system was converted into the WGS 1984 Pseudo-Mercator, with a resolution of 5,000&#xa0;m.</p>
<table-wrap id="T1" position="float">
<label>TABLE 1</label>
<caption>
<p>Data sources.</p>
</caption>
<table>
<thead valign="top">
<tr>
<th align="center">Date name</th>
<th align="center">Data format/precision</th>
<th align="center">Year</th>
<th align="center">Source</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="center">Administrative boundary</td>
<td align="center">Shp</td>
<td align="center">2022</td>
<td align="center">The Ministry of Civil Affairs of the People&#x2019;s Republic of China (<ext-link ext-link-type="uri" xlink:href="http://xzqh.mca.gov.cn/map">http://xzqh.mca.gov.cn/map</ext-link>)</td>
</tr>
<tr>
<td align="center">Land-use data</td>
<td align="center">Tif/30&#xa0;m</td>
<td align="center">2000, 2005, 2010, 2015, 2020</td>
<td align="center">The dataset developed by <xref ref-type="bibr" rid="B57">Yang and Huang (2021)</xref> of Wuhan University</td>
</tr>
<tr>
<td align="center">Gross domestic profit (GDP)</td>
<td align="center">Tif/1,000&#xa0;m</td>
<td align="center">2000, 2010, 2020</td>
<td align="center">The Resource and Environmental Science and Data Center of the Chinese Academy of Sciences (<ext-link ext-link-type="uri" xlink:href="https://www.resdc.cn/">https://www.resdc.cn/</ext-link>)</td>
</tr>
<tr>
<td align="center">Population density</td>
<td align="center">Tif/1,000&#xa0;m</td>
<td align="center">2000, 2010, 2020</td>
<td align="center">
<ext-link ext-link-type="uri" xlink:href="https://www.resdc.cn/">https://www.resdc.cn/</ext-link>
</td>
</tr>
<tr>
<td align="center">Annual rainfall</td>
<td align="center">Tif/1,000&#xa0;m</td>
<td align="center">2000, 2005, 2010, 2015, 2020</td>
<td align="center">
<ext-link ext-link-type="uri" xlink:href="https://www.resdc.cn/">https://www.resdc.cn/</ext-link>
</td>
</tr>
<tr>
<td align="center">Annual average temperature</td>
<td align="center">Tif/1,000&#xa0;m</td>
<td align="center">2000, 2010, 2020</td>
<td align="center">
<ext-link ext-link-type="uri" xlink:href="https://www.resdc.cn/">https://www.resdc.cn/</ext-link>
</td>
</tr>
<tr>
<td align="center">Soil type</td>
<td align="center">Tif/1,000&#xa0;m</td>
<td align="center">&#x2014;</td>
<td align="center">
<ext-link ext-link-type="uri" xlink:href="https://www.resdc.cn/">https://www.resdc.cn/</ext-link>
</td>
</tr>
<tr>
<td align="center">Net primary productivity (NPP)</td>
<td align="center">Tif/500&#xa0;m</td>
<td align="center">2001, 2005, 2010, 2015, 2020</td>
<td align="center">The United States Geological Survey (<ext-link ext-link-type="uri" xlink:href="https://lpdaac.usgs.gov/">https://lpdaac.usgs.gov/</ext-link>)</td>
</tr>
<tr>
<td align="center">Digital elevation model (DEM)</td>
<td align="center">Tif/90&#xa0;m</td>
<td align="center">2020</td>
<td align="center">The Geospatial Data Cloud Platform (<ext-link ext-link-type="uri" xlink:href="https://www.gscloud.cn/">https://www.gscloud.cn/</ext-link>)</td>
</tr>
<tr>
<td align="center">Slope</td>
<td align="center">Tif/30&#xa0;m</td>
<td align="center">2020</td>
<td align="center">Calculated based on DEM</td>
</tr>
<tr>
<td align="center">Distances from roads and railways</td>
<td align="center">Shp/1:10<sup>5</sup>
</td>
<td align="center">2015, 2020</td>
<td align="center">The National Geographic Information Resource Catalog Service System (<ext-link ext-link-type="uri" xlink:href="https://www.webmap.cn/">https://www.webmap.cn/</ext-link>)</td>
</tr>
<tr>
<td align="center">NDVI</td>
<td align="center">Tif/30&#xa0;m</td>
<td align="center">2000, 2005, 2010, 2015, 2020</td>
<td align="center">The National Ecosystem Science Data Center (<ext-link ext-link-type="uri" xlink:href="http://www.nesdc.org.cn/">http://www.nesdc.org.cn/</ext-link>)</td>
</tr>
<tr>
<td align="center">Land-use secondary classification data</td>
<td align="center">Tif/30&#xa0;m</td>
<td align="center">2000, 2010, 2020</td>
<td align="center">
<ext-link ext-link-type="uri" xlink:href="https://www.resdc.cn/">https://www.resdc.cn/</ext-link>
</td>
</tr>
<tr>
<td align="center">Vegetation coverage data</td>
<td align="center">Tif/1,000&#xa0;m</td>
<td align="center">&#x2014;</td>
<td align="center">
<ext-link ext-link-type="uri" xlink:href="https://www.resdc.cn/">https://www.resdc.cn/</ext-link>
</td>
</tr>
<tr>
<td align="center">Boundary vector data for the nature reserves</td>
<td align="center">Shp</td>
<td align="center">&#x2014;</td>
<td align="center">The China Nature Reserve Specimen Resource Sharing Platform (<ext-link ext-link-type="uri" xlink:href="http://www.papc.cn/">http://www.papc.cn/</ext-link>)</td>
</tr>
<tr>
<td align="center">Total grain yield data for cities</td>
<td align="center">&#x2014;</td>
<td align="center">2000, 2010, 2020</td>
<td align="center">The Jiangsu, Shandong, Anhui, Henan, Nanyang, Suizhou and Xiaogan Statistical Yearbooks, <ext-link ext-link-type="uri" xlink:href="http://www.nesdc.org.cn/">http://www.nesdc.org.cn/</ext-link>
</td>
</tr>
<tr>
<td align="center">Yield per unit area and planting area of wheat, rice and corn</td>
<td align="center">&#x2014;</td>
<td align="center">2000, 2005, 2010, 2015, 2020</td>
<td align="center">The Shandong Statistical Yearbook, Anhui Statistical Yearbook, Henan, <italic>Nanyang Statistical Yearbook</italic>, Jiangsu Provincial Department of Agriculture and Rural Affairs (<ext-link ext-link-type="uri" xlink:href="http://nynct.jiangsu.gov.cn/">http://nynct.jiangsu.gov.cn</ext-link>/), <ext-link ext-link-type="uri" xlink:href="http://www.nesdc.org.cn/">http://www.nesdc.org.cn/</ext-link>
</td>
</tr>
<tr>
<td align="center">Prize of wheat, rice and corn for cities</td>
<td align="center">&#x2014;</td>
<td align="center">2000, 2005, 2010, 2015, 2020</td>
<td align="center">The <italic>China Agricultural Product Price Survey Yearbook</italic>
</td>
</tr>
</tbody>
</table>
</table-wrap>
</sec>
<sec id="s2-3">
<title>2.3 Research methods</title>
<p>This research employed land-use data from 2000 to 2020 to analyse the spatiotemporal dynamics of land use in the HREEB. The PLUS model was employed to simulate land-use patterns under three scenarios for the year 2030. Utilizing the equivalent factor method and correction coefficients, the ESV equivalents of various land-use types in the HREEB were adjusted to compute the ESVs. Pearson correlation analysis was performed to analyse the impact of the LUC on the ESV, and geographic detector model, including single-factor and interactive detection, was conducted to study the effects of the LUC, NDVI, soil type, etc. on the ESV (<xref ref-type="fig" rid="F2">Figure 2</xref>).</p>
<fig id="F2" position="float">
<label>FIGURE 2</label>
<caption>
<p>Research framework.</p>
</caption>
<graphic xlink:href="fenvs-13-1617829-g002.tif">
<alt-text content-type="machine-generated">Flowchart illustrating land-use simulation, ESV calculation, and impacts on ESV. It shows steps using the PLUS model and scenarios for natural development, ecological protection, and farmland priority. ESV is calculated using equivalent factor method, with corrections based on market value of grain yield and sensitivity tests. Geographic detector model and Pearson correlation analyze driving factors like land-use change, NDVI, soil type, GDP, etc., affecting ESV. Includes various colored maps and charts.</alt-text>
</graphic>
</fig>
<sec id="s2-3-1">
<title>2.3.1 Conversion matrix of land use</title>
<p>The conversion matrix of land use is a quantitative tool that captures the directional changes and areas of transformation among diverse land-use types from the initial to the final stages of a particular epoch within the investigation zone (<xref ref-type="bibr" rid="B9">Daba and You, 2022</xref>). In our study, For our research, the calculation was performed according to the method suggested by <xref ref-type="bibr" rid="B16">He et al. (2022)</xref>. The resulting data were visualised as a Sankey diagram using the Origin software to illustrate the spatiotemporal dynamics of land-use conversion.</p>
</sec>
<sec id="s2-3-2">
<title>2.3.2 PLUS model</title>
<p>The PLUS model integrates the land expansion analysis strategy (LEAS) module with the CA model (<xref ref-type="bibr" rid="B12">Gao et al., 2022</xref>). The LEAS module can determine how much different land types have grown or decreased in the LUC periods (<xref ref-type="bibr" rid="B51">Wei et al., 2024</xref>). The CA model can enable the dynamic simulation of patch generation under the constraints of development probabilities, neighbourhood probabilities, neighbourhood weights, adaptive inertia and transfer matrices of various land-use types (<xref ref-type="bibr" rid="B25">Liang et al., 2021</xref>).</p>
<p>Land-use simulation accuracy highly depends on selecting driving factors. According to the foundational work of <xref ref-type="bibr" rid="B8">Costanza et al. (2014)</xref> and the specific natural and socioeconomic conditions of the region, this study selected five natural driving factors (DEM, slope, anual average temperature, annual rainfall and soil type) and four socioeconomic driving factors (GDP, population density and distances from roads and railways). Neighbourhood weights, which reflected the expansion probabilities of land-use types, were assigned values of 0&#x2013;1, where 1 and 0 indicated the highest and lowest expansion probabilities, respectively. The formula <xref ref-type="bibr" rid="B25">Liang et al. (2021)</xref> is shown in <xref ref-type="disp-formula" rid="e1">Equation 1</xref> as follows:<disp-formula id="e1">
<mml:math id="m1">
<mml:mrow>
<mml:msub>
<mml:mi>M</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
<mml:mo>&#x3d;</mml:mo>
<mml:mfrac>
<mml:mrow>
<mml:msub>
<mml:mi>S</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
<mml:mo>&#x2212;</mml:mo>
<mml:msub>
<mml:mi>S</mml:mi>
<mml:mi mathvariant="italic">min</mml:mi>
</mml:msub>
</mml:mrow>
<mml:mrow>
<mml:msub>
<mml:mi>S</mml:mi>
<mml:mi mathvariant="italic">max</mml:mi>
</mml:msub>
<mml:mo>&#x2212;</mml:mo>
<mml:msub>
<mml:mi>S</mml:mi>
<mml:mi mathvariant="italic">min</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mfrac>
<mml:mo>.</mml:mo>
</mml:mrow>
</mml:math>
<label>(1)</label>
</disp-formula>
</p>
<p>Here, <inline-formula id="inf1">
<mml:math id="m2">
<mml:mrow>
<mml:msub>
<mml:mi>M</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> represents the neighbourhood weights of <italic>ith</italic> land use type, <inline-formula id="inf2">
<mml:math id="m3">
<mml:mrow>
<mml:msub>
<mml:mi>S</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> denotes the area of <italic>ith</italic> land- use expansion, <inline-formula id="inf3">
<mml:math id="m4">
<mml:mrow>
<mml:msub>
<mml:mi>S</mml:mi>
<mml:mi mathvariant="italic">max</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> denotes the maximum area of land-use expantion, <inline-formula id="inf4">
<mml:math id="m5">
<mml:mrow>
<mml:msub>
<mml:mi>S</mml:mi>
<mml:mi mathvariant="italic">min</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> denotes the minimum area of land-use expansion, respectively.</p>
<p>Using land-use data from 2010 to simulate patterns for 2020, the following neighbourhood weights were derived: farmland (0.100), forest (0.482), shrubland (0.459), grassland (0.423), water body (0.392), barren land (0.459) and artificial surface (1.000). The overall accuracy of simulation model achieved to 91.6%. Furthermor, the Kappa coefficient and Figure of Merit coefficient were up to 0.812 and 0.131, respectively. These results validate the model&#x2019;s reliability for simulating land-use data in 2030.</p>
<p>This study developed land-use transfer rule matrices under three distinct scenarios from 2020 to 2030 based on the land-use transfer matrix from 2010 to 2020 (<xref ref-type="table" rid="T2">Table 2</xref>). (1) The natural development (ND) scenario projected land-use patterns for 2030 based on observed trends from 2010 to 2020, assuming that the future LUC would follow the same trajectory as the previous decade, with no significant deviations or policy interventions. (2) The ecological protection (EP) scenario prioritised ecological conservation by designating forest parks, wetland parks, scenic spots, other natural reserves and water bodies as restricted areas within the HREEB, thereby protecting them from encroachment. Furthermore, land-use transfer rules were adjusted to prevent the conversion of farmlands into artificial surfaces and barren lands as well as the conversion of high-coverage forests into shrublands or grasslands. (3) The farmland priority development (FPD) scenario focused on the protection and prioritised development of farmlands, restricting their conversion into other land-use types, except for water bodies, while allowing necessary conversions of other land-use types to farmlands to ensure sustainable agricultural land use.</p>
<table-wrap id="T2" position="float">
<label>TABLE 2</label>
<caption>
<p>Land-use transfer rule matrix under the three scenarios.</p>
</caption>
<table>
<thead valign="top">
<tr>
<th rowspan="3" align="center">2020&#x2013;2030</th>
<th colspan="7" align="center">Natural development scenario</th>
<th colspan="7" align="center">Ecological protection scenario</th>
<th colspan="7" align="center">Farmland priority development scenario</th>
</tr>
<tr>
<th align="center">F</th>
<th align="center">F</th>
<th align="center">S</th>
<th align="center">G</th>
<th align="center">W</th>
<th align="center">B</th>
<th align="center">A</th>
<th align="center">F</th>
<th align="center">F</th>
<th align="center">S</th>
<th align="center">G</th>
<th align="center">W</th>
<th align="center">B</th>
<th align="center">A</th>
<th align="center">F</th>
<th align="center">F</th>
<th align="center">S</th>
<th align="center">G</th>
<th align="center">W</th>
<th align="center">B</th>
<th align="center">A</th>
</tr>
<tr>
<th align="center">L</th>
<th align="center">R</th>
<th align="center">L</th>
<th align="center">L</th>
<th align="center">B</th>
<th align="center">R</th>
<th align="center">S</th>
<th align="center">L</th>
<th align="center">R</th>
<th align="center">L</th>
<th align="center">L</th>
<th align="center">B</th>
<th align="center">R</th>
<th align="center">S</th>
<th align="center">L</th>
<th align="center">R</th>
<th align="center">L</th>
<th align="center">L</th>
<th align="center">B</th>
<th align="center">R</th>
<th align="center">S</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="center">Farmland (FL)</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">0</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">0</td>
<td align="center">0</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">0</td>
</tr>
<tr>
<td align="center">Forest (FR)</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">0</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">0</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">0</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">0</td>
</tr>
<tr>
<td align="center">Shrubland (SL)</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">0</td>
<td align="center">0</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">1</td>
</tr>
<tr>
<td align="center">Grassland (GL)</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">1</td>
</tr>
<tr>
<td align="center">Water body (WB)</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">0</td>
<td align="center">0</td>
<td align="center">0</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">0</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">0</td>
<td align="center">0</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">0</td>
</tr>
<tr>
<td align="center">Barren land (BR)</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">0</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
</tr>
<tr>
<td align="center">Artificial surfaces (AS)</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">1</td>
<td align="center">0</td>
<td align="center">1</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn id="Tfn1">
<label>
<sup>a</sup>
</label>
<p>&#x201c;1&#x201d; indicates permissible transfer, and &#x201c;0&#x201d; indicates prohibited transfer. <xref ref-type="bibr" rid="B25">Liang et al. (2021)</xref>
</p>
</fn>
</table-wrap-foot>
</table-wrap>
</sec>
<sec id="s2-3-3">
<title>2.3.3 ESV calculation</title>
<p>The ESV equivalents per unit area of farmlands, forests, shrublands, grasslands, water bodies, barren lands and artificial surfaces in the HREEB were referenced from <xref ref-type="bibr" rid="B51">Xie et al. (2015)</xref>&#x2019;s ESV Equivalent Table for China&#x2019;s Terrestrial Ecosystems. This table provides ecological service value coefficients for farmlands, forests, shrublands, grasslands, water bodies, barren lands and exposed lands, which can serve as reference data for calculating the ESV coefficients of farmlands, forests, shrublands, grasslands, water bodies, barren lands and artificial surfaces. Based on the 30-m land-use secondary classification data, the area proportions of dry farmlands and paddy fields within farmlands were calculated to be 72.1% and 27.9%, respectively. Additionally, using the 1000-m vegetation coverage data, the area proportions of coniferous and broad-leaved forests within forests were calculated to be 50.9% and 49.1%, respectively.</p>
<p>Then, the ESV equivalent per unit area was adjusted using one-seventh of the market worth of the mean yield of the region&#x2019;s rice, wheat and corn as the financial worth of a standard equivalent factor (<xref ref-type="bibr" rid="B56">Yang et al., 2024</xref>). During 2000&#x2013;2020, the average yields of rice, wheat and corn in the study area were 7,147.00, 5,221.35 and 5,253.55&#xa0;kg/hm<sup>2</sup>, respectively, with average prices of 2.23, 1.96 and 1.77 CNY/kg, respectively. Utilising the formula proposed by <xref ref-type="bibr" rid="B41">Shi et al. (2023)</xref>, the economic value of a standard equivalent factor in the HREEB was calculated to be 1,615.55 CNY/hm<sup>2</sup>.</p>
<p>The ESV correction coefficients for the HREEB were derived using Formula 2-4 based on NPP, annual rainfall, and NDVI data (<xref ref-type="bibr" rid="B21">Li et al., 2023</xref>; <xref ref-type="bibr" rid="B55">Xie et al., 2015</xref>):<disp-formula id="e2">
<mml:math id="m6">
<mml:mrow>
<mml:mi>A</mml:mi>
<mml:mo>&#x3d;</mml:mo>
<mml:mi>N</mml:mi>
<mml:mo>/</mml:mo>
<mml:mi>N</mml:mi>
<mml:mn>0</mml:mn>
<mml:mo>,</mml:mo>
</mml:mrow>
</mml:math>
<label>(2)</label>
</disp-formula>
<disp-formula id="e3">
<mml:math id="m7">
<mml:mrow>
<mml:mi>B</mml:mi>
<mml:mo>&#x3d;</mml:mo>
<mml:mi>P</mml:mi>
<mml:mo>/</mml:mo>
<mml:mi>P</mml:mi>
<mml:mn>0</mml:mn>
<mml:mo>,</mml:mo>
</mml:mrow>
</mml:math>
<label>(3)</label>
</disp-formula>
<disp-formula id="e4">
<mml:math id="m8">
<mml:mrow>
<mml:mi>C</mml:mi>
<mml:mo>&#x3d;</mml:mo>
<mml:mi>D</mml:mi>
<mml:mo>/</mml:mo>
<mml:mi>D</mml:mi>
<mml:mn>0</mml:mn>
<mml:mo>.</mml:mo>
</mml:mrow>
</mml:math>
<label>(4)</label>
</disp-formula>
</p>
<p>Here, <inline-formula id="inf5">
<mml:math id="m9">
<mml:mrow>
<mml:mi>A</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula> represents the correction coefficients for food production, climate regulation, environment purification, landscape aesthetics, etc. <inline-formula id="inf6">
<mml:math id="m10">
<mml:mrow>
<mml:mi>B</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula> denotes the correction coefficients for water supply and hydrological regulation, whereas <inline-formula id="inf7">
<mml:math id="m11">
<mml:mrow>
<mml:mi>C</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula> denotes the correction coefficient for enhancing soil preservation practices. <inline-formula id="inf8">
<mml:math id="m12">
<mml:mrow>
<mml:mi>N</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula id="inf9">
<mml:math id="m13">
<mml:mrow>
<mml:mi>N</mml:mi>
<mml:mn>0</mml:mn>
</mml:mrow>
</mml:math>
</inline-formula> are the NPP values for the HREEB and the national average, respectively. <inline-formula id="inf10">
<mml:math id="m14">
<mml:mrow>
<mml:mi>P</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula> and P0 are the annual rainfall values for the HREEB and the national average, respectively. <inline-formula id="inf11">
<mml:math id="m15">
<mml:mrow>
<mml:mi>D</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula> and D0 are the NDVI values for the HREEB and the national average, respectively.</p>
<p>Based on the previous correction, <xref ref-type="disp-formula" rid="e5">Equation 5</xref> was used to further adjust the ESV equivalent value per unit area for various land-use types in the HREEB (<xref ref-type="table" rid="T3">Table 3</xref>) then the overall ESV of the region was calculated using <xref ref-type="disp-formula" rid="e6">Equation 6</xref> (<xref ref-type="bibr" rid="B30">Mamat et al., 2024</xref>):<disp-formula id="e5">
<mml:math id="m16">
<mml:mrow>
<mml:msub>
<mml:mi mathvariant="italic">VC</mml:mi>
<mml:mi mathvariant="italic">ij</mml:mi>
</mml:msub>
<mml:mo>&#x3d;</mml:mo>
<mml:msub>
<mml:mi mathvariant="italic">F</mml:mi>
<mml:mi mathvariant="italic">ij</mml:mi>
</mml:msub>
<mml:mo>&#xd7;</mml:mo>
<mml:mi mathvariant="italic">E</mml:mi>
<mml:mo>,</mml:mo>
</mml:mrow>
</mml:math>
<label>(5)</label>
</disp-formula>
<disp-formula id="e6">
<mml:math id="m17">
<mml:mrow>
<mml:msub>
<mml:mi mathvariant="italic">ESV</mml:mi>
<mml:mi mathvariant="italic">S</mml:mi>
</mml:msub>
<mml:mo>&#x3d;</mml:mo>
<mml:mo>&#x2211;</mml:mo>
<mml:msub>
<mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">i</mml:mi>
</mml:msub>
<mml:mo>&#xd7;</mml:mo>
<mml:msub>
<mml:mi mathvariant="italic">VC</mml:mi>
<mml:mi mathvariant="italic">i</mml:mi>
</mml:msub>
<mml:mo>.</mml:mo>
</mml:mrow>
</mml:math>
<label>(6)</label>
</disp-formula>
</p>
<table-wrap id="T3" position="float">
<label>TABLE 3</label>
<caption>
<p>ESV equivalent per unit area in the HREEB (CNY&#xb7;hm<sup>&#x2212;2</sup>&#xb7;a<sup>&#x2212;1</sup>).</p>
</caption>
<table>
<thead valign="top">
<tr>
<th align="center">Ecological service function (first level classification</th>
<th align="center">Ecological service function (seconddary classification)</th>
<th align="center">Farmland</th>
<th align="center">Forest</th>
<th align="center">Shrubland</th>
<th align="center">Grassland</th>
<th align="center">Water body</th>
<th align="center">Barren land</th>
<th align="center">Artificial surfaces</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td rowspan="3" align="center">Provision service</td>
<td align="center">Food production</td>
<td align="center">1673.63</td>
<td align="center">428.91</td>
<td align="center">320.40</td>
<td align="center">393.47</td>
<td align="center">1349.04</td>
<td align="center">16.86</td>
<td align="center">0.00</td>
</tr>
<tr>
<td align="center">Raw-material production</td>
<td align="center">528.47</td>
<td align="center">992.73</td>
<td align="center">725.11</td>
<td align="center">578.96</td>
<td align="center">387.85</td>
<td align="center">50.59</td>
<td align="center">0.00</td>
</tr>
<tr>
<td align="center">Water-resource supply</td>
<td align="center">2150.16</td>
<td align="center">873.48</td>
<td align="center">631.40</td>
<td align="center">545.30</td>
<td align="center">23792.20</td>
<td align="center">57.40</td>
<td align="center">0.00</td>
</tr>
<tr>
<td rowspan="4" align="center">Regulating service</td>
<td align="center">Gas regulation</td>
<td align="center">1337.12</td>
<td align="center">3255.64</td>
<td align="center">2377.68</td>
<td align="center">2034.80</td>
<td align="center">1298.45</td>
<td align="center">185.49</td>
<td align="center">33.73</td>
</tr>
<tr>
<td align="center">Climate regulation</td>
<td align="center">706.00</td>
<td align="center">9732.89</td>
<td align="center">7133.05</td>
<td align="center">5379.30</td>
<td align="center">3861.63</td>
<td align="center">168.63</td>
<td align="center">0.00</td>
</tr>
<tr>
<td align="center">Environment purification</td>
<td align="center">201.61</td>
<td align="center">2876.69</td>
<td align="center">2158.46</td>
<td align="center">1776.24</td>
<td align="center">9358.97</td>
<td align="center">522.75</td>
<td align="center">16.86</td>
</tr>
<tr>
<td align="center">Hydrological regulation</td>
<td align="center">2739.36</td>
<td align="center">11557.50</td>
<td align="center">9614.46</td>
<td align="center">6706.21</td>
<td align="center">293427.60</td>
<td align="center">602.70</td>
<td align="center">86.10</td>
</tr>
<tr>
<td rowspan="3" align="center">Supporting service</td>
<td align="center">Soil conservation</td>
<td align="center">1765.52</td>
<td align="center">5567.76</td>
<td align="center">4075.94</td>
<td align="center">3483.51</td>
<td align="center">2203.85</td>
<td align="center">308.07</td>
<td align="center">47.39</td>
</tr>
<tr>
<td align="center">Nutrient cycling</td>
<td align="center">235.33</td>
<td align="center">302.91</td>
<td align="center">219.22</td>
<td align="center">191.11</td>
<td align="center">118.04</td>
<td align="center">16.86</td>
<td align="center">0.00</td>
</tr>
<tr>
<td align="center">Biodiversity maintenance</td>
<td align="center">256.91</td>
<td align="center">3608.83</td>
<td align="center">2647.49</td>
<td align="center">2254.02</td>
<td align="center">4300.07</td>
<td align="center">202.36</td>
<td align="center">33.73</td>
</tr>
<tr>
<td align="center">Cultural service</td>
<td align="center">Landscape aesthetics</td>
<td align="center">115.31</td>
<td align="center">1581.37</td>
<td align="center">1163.55</td>
<td align="center">994.92</td>
<td align="center">3187.11</td>
<td align="center">84.32</td>
<td align="center">16.86</td>
</tr>
<tr>
<td align="left"/>
<td align="center">Total</td>
<td align="center">11709.43</td>
<td align="center">40778.72</td>
<td align="center">31066.76</td>
<td align="center">24337.84</td>
<td align="center">343284.81</td>
<td align="center">2216.03</td>
<td align="center">234.67</td>
</tr>
</tbody>
</table>
</table-wrap>
<p>Here, <italic>VC</italic>
<sub>
<italic>ij</italic>
</sub> is the ESV equivalent per unit area (CNY/hm<sup>2</sup>), E is the financial worth of one standard equivalent in the HREEB and <italic>F</italic>
<sub>
<italic>ij</italic>
</sub> is the corrected ESV equivalent for the <italic>j</italic>th service function of the <italic>i</italic>th land-use type. ESVs represents the overall ESV of the HREEB (CNY), <italic>Ai</italic> is the area of the <italic>i</italic>th land-use type (hm<sup>2</sup>), <italic>VC</italic>
<sub>
<italic>i</italic>
</sub> is the sum of the ESV equivalent per unit area for all service functions of the <italic>i</italic>th land-use type.</p>
</sec>
<sec id="s2-3-4">
<title>2.3.4 ESV sensitivity test</title>
<p>The ESV sensitivity test is conducted to evaluate the reliance of ESV assessment outcomes on ESV equivalents (<xref ref-type="bibr" rid="B37">Qiu et al., 2021</xref>). To conduct this analysis, the ESV equivalents per unit area for different land-use types were adjusted by &#xb1;50%, and the resulting changes in the overall ESV were calculated as the following <xref ref-type="disp-formula" rid="e7">Equation 7</xref> (<xref ref-type="bibr" rid="B43">Tao et al., 2024</xref>):<disp-formula id="e7">
<mml:math id="m18">
<mml:mrow>
<mml:mi mathvariant="italic">CS</mml:mi>
<mml:mo>&#x3d;</mml:mo>
<mml:mfrac>
<mml:mrow>
<mml:mrow>
<mml:mfenced open="(" close=")" separators="|">
<mml:mrow>
<mml:msub>
<mml:mi mathvariant="italic">ESV</mml:mi>
<mml:mi mathvariant="italic">b</mml:mi>
</mml:msub>
<mml:mo>&#x2212;</mml:mo>
<mml:msub>
<mml:mi mathvariant="italic">ESV</mml:mi>
<mml:mi mathvariant="italic">a</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mfenced>
</mml:mrow>
<mml:mo>/</mml:mo>
<mml:msub>
<mml:mi mathvariant="italic">ESV</mml:mi>
<mml:mi mathvariant="italic">a</mml:mi>
</mml:msub>
</mml:mrow>
<mml:mrow>
<mml:mrow>
<mml:mfenced open="(" close=")" separators="|">
<mml:mrow>
<mml:msub>
<mml:mi mathvariant="italic">VC</mml:mi>
<mml:mi mathvariant="italic">b</mml:mi>
</mml:msub>
<mml:mo>&#x2212;</mml:mo>
<mml:msub>
<mml:mi mathvariant="italic">VC</mml:mi>
<mml:mi mathvariant="italic">a</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mfenced>
</mml:mrow>
<mml:mo>/</mml:mo>
<mml:msub>
<mml:mi mathvariant="italic">VC</mml:mi>
<mml:mi mathvariant="italic">a</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mfrac>
</mml:mrow>
</mml:math>
<label>(7)</label>
</disp-formula>
</p>
<p>Here, <italic>CS</italic> denotes the coefficient of ESV sensitivity. <italic>ESV</italic>
<sub>
<italic>a</italic>
</sub> represents the pre-adjustment overall ESV, and <italic>ESV</italic>
<sub>
<italic>b</italic>
</sub> represents the post-adjustment overall ESV. <italic>VC</italic>
<sub>
<italic>a</italic>
</sub> represents the pre-adjustment ESV equivalent, and <italic>VC</italic>
<sub>
<italic>b</italic>
</sub> represents the post-adjustment ESV equivalent. A <italic>CS</italic> value less than 1 suggests inelasticity, thereby substantiating the reliability of the research findings.</p>
</sec>
<sec id="s2-3-5">
<title>2.3.5 Geographic detector model</title>
<p>The geographic detector model identifies and quantifies factors influencing a geographical phenomenon by creating smaller, delineated sections within the study area and analysing the means and variances of the geographic variables (<xref ref-type="bibr" rid="B58">Yu et al., 2023</xref>). Herein, drawing on the research of <xref ref-type="bibr" rid="B61">Zhang X. et al. (2023)</xref>, 12 driving factors were selected: LUC (X1), NDVI (X2), soil type (X3), DEM (X4), slope (X5), annual average temperature (X6), annual rainfall (X7), distance from roads (X8), distance from railways (X9), population density (X10), GDP (X11) and total grain yield (X12). The single-factor detection was conducted to examine the relationship between the ESV and these driving factors. An interactive detection was utilised to identify the combined effects of these driving factors on ESV changes, evaluating whether the explanatory power of the ESV increased when two driving factors interacted.</p>
</sec>
</sec>
</sec>
<sec sec-type="results" id="s3">
<title>3 Results</title>
<sec id="s3-1">
<title>3.1 Structures of land-use types</title>
<p>
<xref ref-type="table" rid="T4">Table 4</xref> presents the area and proportion of each land-use type in the HREEB during 2000&#x2013;2020. Farmlands were the dominant land-use type, covering over 72% of the total area, followed by artificial surfaces, forests and water bodies. The area of farmlands decreased from 29,128,618.44 to 27,208,206.09&#xa0;hm<sup>2</sup>, while the area of grasslands decreased from 241,799.22 to 123,396.39&#xa0;hm<sup>2</sup>. Meanwhile, the area of artificial surfaces increased from 3,977,380.08 to 5,751,793.71&#xa0;hm<sup>2</sup>. During 2000&#x2013;2005, the area of water bodies increased by 219,457.89&#xa0;hm<sup>2</sup>, whereas from 2005 to 2020, it decreased by 130,114.53&#xa0;hm<sup>2</sup>.</p>
<table-wrap id="T4" position="float">
<label>TABLE 4</label>
<caption>
<p>LUC statistics in the HREEB (hm<sup>2</sup>/%).</p>
</caption>
<table>
<thead valign="top">
<tr>
<th rowspan="2" align="center">Land-use type</th>
<th align="center">2000</th>
<th align="center">2005</th>
<th align="center">2010</th>
<th align="center">2015</th>
<th align="center">2020</th>
</tr>
<tr>
<th align="center">Area (proportion)</th>
<th align="center">Area (proportion)</th>
<th align="center">Area (proportion)</th>
<th align="center">Area (proportion)</th>
<th align="center">Area (proportion)</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="center">Farmland</td>
<td align="center">29128618.44 (77.46)</td>
<td align="center">28517337.27 (75.84)</td>
<td align="center">28066660.65 (74.64)</td>
<td align="center">27335787.93 (72.70)</td>
<td align="center">27208206.09 (72.36)</td>
</tr>
<tr>
<td align="center">Forest</td>
<td align="center">2748572.91 (7.31)</td>
<td align="center">2891975.76 (7.69)</td>
<td align="center">2884215.15 (7.67)</td>
<td align="center">3043600.56 (8.09)</td>
<td align="center">2927339.28 (7.78)</td>
</tr>
<tr>
<td align="center">Shrubland</td>
<td align="center">437.85 (0.00)</td>
<td align="center">339.75 (0.00)</td>
<td align="center">212.85 (0.00)</td>
<td align="center">130.32 (0.00)</td>
<td align="center">182.34 (0.00)</td>
</tr>
<tr>
<td align="center">Grassland</td>
<td align="center">241799.22 (0.64)</td>
<td align="center">204580.17 (0.54)</td>
<td align="center">191472.12 (0.51)</td>
<td align="center">167543.82 (0.45)</td>
<td align="center">123396.39 (0.33)</td>
</tr>
<tr>
<td align="center">Water body</td>
<td align="center">1502253.36 (4.00)</td>
<td align="center">1721711.25 (4.58)</td>
<td align="center">1717774.74 (4.57)</td>
<td align="center">1672488.09 (4.45)</td>
<td align="center">1591596.72 (4.23)</td>
</tr>
<tr>
<td align="center">Barren land</td>
<td align="center">4025.25 (0.01)</td>
<td align="center">1778.31 (0.00)</td>
<td align="center">1245.87 (0.00)</td>
<td align="center">698.13 (0.00)</td>
<td align="center">572.58 (0.00)</td>
</tr>
<tr>
<td align="center">Artificial surfaces</td>
<td align="center">3977380.08 (10.58)</td>
<td align="center">4265364.60 (11.34)</td>
<td align="center">4741505.73 (12.61)</td>
<td align="center">5382838.26 (14.31)</td>
<td align="center">5751793.71 (15.30)</td>
</tr>
</tbody>
</table>
</table-wrap>
</sec>
<sec id="s3-2">
<title>3.2 Conversion of land use</title>
<p>
<xref ref-type="fig" rid="F3">Figure 3</xref> illustrates the conversion of land use from 2000 to 2020. Farmlands were converted into artificial surfaces (2,120,686.38&#xa0;hm<sup>2</sup>), forests (394,344.90&#xa0;hm<sup>2</sup>) and water bodies (321,976.44&#xa0;hm<sup>2</sup>). Water bodies were converted into farmlands (221,357.34&#xa0;hm<sup>2</sup>), artificial surfaces (96,714.18&#xa0;hm<sup>2</sup>) and forests (3,422.16&#xa0;hm<sup>2</sup>). Artificial surfaces were converted into farmlands (384,670.53&#xa0;hm<sup>2</sup>) and water bodies (81,874.26&#xa0;hm<sup>2</sup>). Forests (240,673.14&#xa0;hm<sup>2</sup>) and grasslands (104,368.68&#xa0;hm<sup>2</sup>) were primarily converted into farmlands, with forests (2,937.15&#xa0;hm<sup>2</sup>) converted into water bodies. Furthermore, farmlands converted into artificial surfaces exceeded artificial surfaces converted into farmlands by 1,736,015.85&#xa0;hm<sup>2</sup>. Therefore, the decrease in the area of water bodies was mainly due to their conversion into farmlands, artificial surfaces and forests. <xref ref-type="fig" rid="F4">Figures 4a&#x2010;e</xref> shows the expansion of artificial surfaces from urban areas to surrounding farmlands, with farmlands converting into forests in southwestern Dabie Mountains. Large areas of farmlands near Weishan Lake in Shandong were converted into water bodies, while water bodies were converted into artificial surfaces in the eastern coastal regions. Over the past 20&#xa0;years, water bodies were occupied by farmlands and artificial surfaces, farmlands were occupied by artificial surfaces, forests and grasslands were occupied by farmlands and artificial surfaces, and a large amount of grassland were transferred to forests.</p>
<fig id="F3" position="float">
<label>FIGURE 3</label>
<caption>
<p>Diagram showing land-use conversion in the HREEB.</p>
</caption>
<graphic xlink:href="fenvs-13-1617829-g003.tif">
<alt-text content-type="machine-generated">A Sankey diagram illustrating land use changes from 2000 to 2020 in hectares. Categories include farmland, forest, grassland, water body, barren land, and artificial surfaces, with transitions between types. Color-coded flows represent quantities moving between land types over the years, with specific numerical data depicted in boxes for each year.</alt-text>
</graphic>
</fig>
<fig id="F4" position="float">
<label>FIGURE 4</label>
<caption>
<p>Land-use maps from 2000 to 2030. <bold>(a)</bold> Land-use map in 2000; <bold>(b)</bold> Land-use map in 2005; <bold>(c)</bold> Land-use map in 2010; <bold>(d)</bold> Land-use map in 2015; <bold>(e)</bold> Land-use map in 2020; <bold>(f)</bold> Land-use simulation map under the ND scenario in 2030; <bold>(g)</bold> Land-use simulation map under the EP scenario in 2030; <bold>(h)</bold> Land-use simulation map under the FPD scenario in 2030.</p>
</caption>
<graphic xlink:href="fenvs-13-1617829-g004.tif">
<alt-text content-type="machine-generated">Land use maps of a region from 2000 to 2030 show changes in farmland, forest, shrubland, grassland, water bodies, barren land, and artificial surfaces. Each map highlights areas in distinct colors based on land type, with a scale of 0 to 800 kilometers.</alt-text>
</graphic>
</fig>
</sec>
<sec id="s3-3">
<title>3.3 Multi-scenario LUC simulation</title>
<p>According to <xref ref-type="table" rid="T5">Table 5</xref> and <xref ref-type="fig" rid="F4">Figures 4f&#x2010;h</xref>, under the ND scenario, the farmland area will decrease by 2.77% to 26,454,456.18&#xa0;hm<sup>2</sup> by 2030 in the HREEB. The water body area will decrease by 3.66%, whereas the areas of artificial surfaces and forests will increase by 13.74% and 0.74%, respectively. Artificial surfaces will continue to be converted rapidly into peripheral farmlands. Under the EP scenario, water bodies, national and provincial forest parks, wetland parks, scenic spots and other natural reserves are classified as protected zones. Consequently, the area of artificial surfaces will decrease by 13.45% to 5,661,966.33&#xa0;hm<sup>2</sup> by 2030, whereas the areas of water bodies, forests and grasslands will rise. Under the FPD scenario, the farmland area will increase by 1.07% to 27,442,860.66&#xa0;hm<sup>2</sup> by 2030, whereas artificial surfaces, forests, grasslands and water bodies will all experience significant reductions in area. Therefore, the land-use pattern in 2030 under ecological protection will be the most reasonable, followed by the FPD scenario, and finally the ND scenario.</p>
<table-wrap id="T5" position="float">
<label>TABLE 5</label>
<caption>
<p>Simulation results of land use in 2030.</p>
</caption>
<table>
<thead valign="top">
<tr>
<th align="center">Simulated scenario</th>
<th align="center">Farmland</th>
<th align="center">Forest</th>
<th align="center">Shrubland</th>
<th align="center">Grassland</th>
<th align="center">Water body</th>
<th align="center">Barren land</th>
<th align="center">Artificial surfaces</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="center">Natural development scenario in 2030</td>
<td align="center">26454456.18 (&#x2212;2.77)</td>
<td align="center">2949075.27 (0.74)</td>
<td align="center">178.65 (&#x2212;2.02)</td>
<td align="center">123,605.28 (0.17)</td>
<td align="center">1533285.18 (&#x2212;3.66)</td>
<td align="center">508.05 (&#x2212;11.27)</td>
<td align="center">6541978.5 (13.74)</td>
</tr>
<tr>
<td align="center">Ecological protection scenario in 2030</td>
<td align="center">27152701.92 (2.64)</td>
<td align="center">2949075.27 (0.00)</td>
<td align="center">180.09 (0.81)</td>
<td align="center">131,037.84 (6.01)</td>
<td align="center">1707662.97 (11.37)</td>
<td align="center">462.69 (&#x2212;8.93)</td>
<td align="center">5661966.33 (&#x2212;13.45)</td>
</tr>
<tr>
<td align="center">Farmland priority development scenario</td>
<td align="center">27442860.66 (1.07)</td>
<td align="center">2811783.33 (&#x2212;4.66)</td>
<td align="center">166.77 (&#x2212;7.40)</td>
<td align="center">103675.68 (&#x2212;20.88)</td>
<td align="center">1586344.14 (&#x2212;7.10)</td>
<td align="center">450.18 (&#x2212;2.70)</td>
<td align="center">5657806.35 (&#x2212;0.07)</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn id="Tfn2">
<label>
<sup>a</sup>
</label>
<p>Values outside and inside the brackets represent the area (in hm<sup>2</sup>) and its change percentage of land-use type from 2020 to 2030 (in %), respectively. (<xref ref-type="bibr" rid="B16">He et al., 2022</xref>)</p>
</fn>
</table-wrap-foot>
</table-wrap>
</sec>
<sec id="s3-4">
<title>3.4 ESV dynamics</title>
<p>
<xref ref-type="table" rid="T6">Table 6</xref> illustrates that the overall ESV of the HREEB increased by CNY 12.993 billion from 2000 to 2020. This increase was primarily driven by a CNY 30.670 billion increase in the water body ESV, despite a CNY 22.487 billion decrease in the farmland ESV. Between 2000 and 2005, the overall ESV increased by CNY 73.180 billion; however, from 2015 to 2020, it decreased by CNY 34.990 billion, largely due to a CNY 27.769 billion decrease in the water body ESV.</p>
<table-wrap id="T6" position="float">
<label>TABLE 6</label>
<caption>
<p>ESV variation of the HREEB (billion).</p>
</caption>
<table>
<thead valign="top">
<tr>
<th align="center">ESV/ESV variation</th>
<th align="center">Farmland</th>
<th align="center">Forest</th>
<th align="center">Shrubland</th>
<th align="center">Grassland</th>
<th align="center">Water body</th>
<th align="center">Barren land</th>
<th align="center">Artificial surfaces</th>
<th align="center">Total</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="center">2000</td>
<td align="center">341.079</td>
<td align="center">112.083</td>
<td align="center">0.014</td>
<td align="center">5.885</td>
<td align="center">515.701</td>
<td align="center">0.009</td>
<td align="center">0.933</td>
<td align="center">975.704</td>
</tr>
<tr>
<td align="center">2005</td>
<td align="center">333.922</td>
<td align="center">117.931</td>
<td align="center">0.011</td>
<td align="center">4.979</td>
<td align="center">591.037</td>
<td align="center">0.004</td>
<td align="center">1.001</td>
<td align="center">1048.885</td>
</tr>
<tr>
<td align="center">2010</td>
<td align="center">328.645</td>
<td align="center">117.615</td>
<td align="center">0.007</td>
<td align="center">4.660</td>
<td align="center">589.686</td>
<td align="center">0.003</td>
<td align="center">1.113</td>
<td align="center">1041.727</td>
</tr>
<tr>
<td align="center">2015</td>
<td align="center">320.086</td>
<td align="center">124.114</td>
<td align="center">0.004</td>
<td align="center">4.078</td>
<td align="center">574.140</td>
<td align="center">0.002</td>
<td align="center">1.263</td>
<td align="center">1023.687</td>
</tr>
<tr>
<td align="center">2020</td>
<td align="center">318.593</td>
<td align="center">119.373</td>
<td align="center">0.006</td>
<td align="center">3.003</td>
<td align="center">546.371</td>
<td align="center">0.001</td>
<td align="center">1.350</td>
<td align="center">988.697</td>
</tr>
<tr>
<td align="center">2030 A</td>
<td align="center">309.767</td>
<td align="center">120.260</td>
<td align="center">0.006</td>
<td align="center">3.008</td>
<td align="center">526.354</td>
<td align="center">0.001</td>
<td align="center">1.535</td>
<td align="center">960.930</td>
</tr>
<tr>
<td align="center">2030 B</td>
<td align="center">317.943</td>
<td align="center">120.260</td>
<td align="center">0.006</td>
<td align="center">3.189</td>
<td align="center">586.215</td>
<td align="center">0.001</td>
<td align="center">1.329</td>
<td align="center">1028.941</td>
</tr>
<tr>
<td align="center">2030 C</td>
<td align="center">321.340</td>
<td align="center">114.661</td>
<td align="center">0.005</td>
<td align="center">2.523</td>
<td align="center">544.568</td>
<td align="center">0.001</td>
<td align="center">1.328</td>
<td align="center">984.426</td>
</tr>
<tr>
<td align="center">2000&#x2014;2005</td>
<td align="center">&#x2212;7.158</td>
<td align="center">5.848</td>
<td align="center">&#x2212;0.003</td>
<td align="center">&#x2212;0.906</td>
<td align="center">75.337</td>
<td align="center">&#x2212;0.005</td>
<td align="center">0.068</td>
<td align="center">73.180</td>
</tr>
<tr>
<td align="center">2005&#x2014;2010</td>
<td align="center">&#x2212;5.277</td>
<td align="center">&#x2212;0.316</td>
<td align="center">&#x2212;0.004</td>
<td align="center">&#x2212;0.319</td>
<td align="center">&#x2212;1.351</td>
<td align="center">&#x2212;0.001</td>
<td align="center">0.112</td>
<td align="center">&#x2212;7.157</td>
</tr>
<tr>
<td align="center">2010&#x2014;2015</td>
<td align="center">&#x2212;8.558</td>
<td align="center">6.500</td>
<td align="center">&#x2212;0.003</td>
<td align="center">&#x2212;0.582</td>
<td align="center">&#x2212;15.546</td>
<td align="center">&#x2212;0.001</td>
<td align="center">0.151</td>
<td align="center">&#x2212;18.040</td>
</tr>
<tr>
<td align="center">2015&#x2014;2020</td>
<td align="center">&#x2212;1.494</td>
<td align="center">&#x2212;4.741</td>
<td align="center">0.002</td>
<td align="center">&#x2212;1.074</td>
<td align="center">&#x2212;27.769</td>
<td align="center">0.000</td>
<td align="center">0.087</td>
<td align="center">&#x2212;34.990</td>
</tr>
<tr>
<td align="center">2000&#x2014;2020</td>
<td align="center">&#x2212;22.487</td>
<td align="center">7.290</td>
<td align="center">&#x2212;0.008</td>
<td align="center">&#x2212;2.882</td>
<td align="center">30.670</td>
<td align="center">&#x2212;0.008</td>
<td align="center">0.416</td>
<td align="center">12.993</td>
</tr>
<tr>
<td align="center">2020&#x2014;2030 A</td>
<td align="center">&#x2212;8.826</td>
<td align="center">0.886</td>
<td align="center">0.000</td>
<td align="center">0.005</td>
<td align="center">&#x2212;20.017</td>
<td align="center">0.000</td>
<td align="center">0.185</td>
<td align="center">&#x2212;27.767</td>
</tr>
<tr>
<td align="center">2020&#x2014;2030 B</td>
<td align="center">&#x2212;0.650</td>
<td align="center">0.886</td>
<td align="center">0.000</td>
<td align="center">0.186</td>
<td align="center">39.844</td>
<td align="center">0.000</td>
<td align="center">&#x2212;0.021</td>
<td align="center">40.245</td>
</tr>
<tr>
<td align="center">2020&#x2014;2030 C</td>
<td align="center">2.748</td>
<td align="center">&#x2212;4.712</td>
<td align="center">0.000</td>
<td align="center">&#x2212;0.480</td>
<td align="center">&#x2212;1.803</td>
<td align="center">0.000</td>
<td align="center">&#x2212;0.022</td>
<td align="center">&#x2212;4.270</td>
</tr>
</tbody>
</table>
</table-wrap>
<p>Projections for 2020&#x2013;2030 indicated varying ESV trends: (1) Under the ND scenario, water body and farmland ESVs would decrease, decreasing the overall ESV by CNY 27.767 billion. (2) Under the EP scenario, water body, forest and grassland ESVs would increase, increasing the overall ESV by CNY 40.245 billion. (3) Under the FPD scenario, farmland ESV would increase, but water body, forest and grassland ESVs would decrease, decreasing the overall ESV by CNY 4.270 billion. Thus, under the EP scenario, the ESV will be highest in 2030, followed by the FPD scenario, and the ESV will be the lowest under the ND scenario.</p>
</sec>
<sec id="s3-5">
<title>3.5 Analysis of ESV sensitivity</title>
<p>The CS was utilised to evaluate the responsiveness of the ESV to the ESV equivalents from 2000 to 2030. As illustrated in <xref ref-type="table" rid="T7">Table 7</xref>, all land-use types exhibited CS values below 1, demonstrating that the ESV is inelastic to ESV equivalents and confirming the robustness of the findings. Water bodies displayed the highest ESV sensitivity index, followed by farmlands and forests. The analysis shows that on the one hand, the water body ESV is much higher than that of other land types, and on the other hand, the HREEB is a water ecological sensitive area. However, human activities such as land reclamation, pond digging and aquaculture, dam construction, and river hardening in the Hongze Lake and Gaoyou Lake areas downstream of the Huai River have caused extensive degradation of wetland water bodies, resulting in a decrease in biodiversity, flood regulation capacity, water purification and other ecological service functions in the region.</p>
<table-wrap id="T7" position="float">
<label>TABLE 7</label>
<caption>
<p>Sensitivity test of ESV in the HREEB.</p>
</caption>
<table>
<thead valign="top">
<tr>
<th align="center">Year</th>
<th align="center">Farmland</th>
<th align="center">Forest</th>
<th align="center">Shrubland</th>
<th align="center">Grassland</th>
<th align="center">Water body</th>
<th align="center">Barren land</th>
<th align="center">Artificial surfaces</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="center">2000</td>
<td align="center">0.349573</td>
<td align="center">0.114874</td>
<td align="center">0.000014</td>
<td align="center">0.006031</td>
<td align="center">0.528542</td>
<td align="center">0.000009</td>
<td align="center">0.000957</td>
</tr>
<tr>
<td align="center">2005</td>
<td align="center">0.318359</td>
<td align="center">0.112435</td>
<td align="center">0.000010</td>
<td align="center">0.004747</td>
<td align="center">0.563491</td>
<td align="center">0.000004</td>
<td align="center">0.000954</td>
</tr>
<tr>
<td align="center">2010</td>
<td align="center">0.315480</td>
<td align="center">0.112903</td>
<td align="center">0.000006</td>
<td align="center">0.004473</td>
<td align="center">0.566066</td>
<td align="center">0.000003</td>
<td align="center">0.001068</td>
</tr>
<tr>
<td align="center">2015</td>
<td align="center">0.312680</td>
<td align="center">0.121242</td>
<td align="center">0.000004</td>
<td align="center">0.003983</td>
<td align="center">0.560855</td>
<td align="center">0.000002</td>
<td align="center">0.001234</td>
</tr>
<tr>
<td align="center">2020</td>
<td align="center">0.322235</td>
<td align="center">0.120738</td>
<td align="center">0.000006</td>
<td align="center">0.003038</td>
<td align="center">0.552617</td>
<td align="center">0.000001</td>
<td align="center">0.001365</td>
</tr>
<tr>
<td align="center">2030 A</td>
<td align="center">0.322361</td>
<td align="center">0.125149</td>
<td align="center">0.000006</td>
<td align="center">0.003131</td>
<td align="center">0.547754</td>
<td align="center">0.000001</td>
<td align="center">0.001598</td>
</tr>
<tr>
<td align="center">2030 B</td>
<td align="center">0.309000</td>
<td align="center">0.116877</td>
<td align="center">0.000005</td>
<td align="center">0.003099</td>
<td align="center">0.569726</td>
<td align="center">0.000001</td>
<td align="center">0.001291</td>
</tr>
<tr>
<td align="center">2030 C</td>
<td align="center">0.326424</td>
<td align="center">0.116475</td>
<td align="center">0.000005</td>
<td align="center">0.002563</td>
<td align="center">0.553183</td>
<td align="center">0.000001</td>
<td align="center">0.001349</td>
</tr>
</tbody>
</table>
</table-wrap>
</sec>
<sec id="s3-6">
<title>3.6 Driving-force analysis of the ESV</title>
<p>As depicted in <xref ref-type="fig" rid="F5">Figure 5</xref>, during 2000&#x2013;2030, the overall ESV in the HREEB exhibited a highly significant positive correlation with the water body area, while showing a negative correlation with the artificial surface area. Additionally, the ESV was positively correlated with the farmland, forest and, grassland areas. The artificial surface area demonstrated a highly significant negative correlation with the farmland and grassland areas as well as a significant negative correlation with the shrubland and barren-land areas. The grassland area was highly positively correlated with the farmland area and significantly positively correlated with the shrubland area. Furthermore, the shrubland area showed a highly significant positive correlation with the farmland area but a significant negative correlation with the forest area.</p>
<fig id="F5" position="float">
<label>FIGURE 5</label>
<caption>
<p>Correlation between land-use areas and ESV in the HREEB. Note: &#x2a;<italic>P</italic> &#x2264; 0.05, &#x2a;&#x2a;<italic>P</italic> &#x2264; 0.01.</p>
</caption>
<graphic xlink:href="fenvs-13-1617829-g005.tif">
<alt-text content-type="machine-generated">Correlation matrix showing relationships between different land types, including farmland, forest, shrubland, grassland, water body, barren land, artificial surfaces, and ESV. Positive correlations are marked in red and negative in blue, with intensity indicating strength.</alt-text>
</graphic>
</fig>
<p>The single-factor detection results for 2000&#x2013;2020 (<xref ref-type="fig" rid="F6">Figure 6</xref>) revealed that the P-values of all factors were below 0.005, indicating their significant influence on the geographic distribution of the ESV. Among these factors, LUC, NDVI and soil type exhibited q-values greater than 0.3, demonstrating their high explanatory contributions to the ESV geographic distribution. DEM and distance from roads consistently showed q-values above 0.1, representing secondary influencing factors. Interaction detection analysis (<xref ref-type="fig" rid="F7">Figure 7</xref>) further highlighted that land-use change, NDVI and soil type remained the primary drivers of the ESV geographic distribution. The q-values for any interaction between two factors exceeded those of single-factor detection, with certain interactions (e.g., X5, X6, X7, X9, X10 and X12) increasing to above 0.1 and some even surpassing 0.2. This suggested that interactions between factors amplified their driving effects on the ESV spatial distribution.</p>
<fig id="F6" position="float">
<label>FIGURE 6</label>
<caption>
<p>Results of single-factor detection during 2000&#x2013;2020.</p>
</caption>
<graphic xlink:href="fenvs-13-1617829-g006.tif">
<alt-text content-type="machine-generated">Bar chart comparing twelve driving factors (X1 to X12) with q values for the years 2000, 2010, and 2020. Each factor has three bars representing different years in orange, green, and purple. X1 and have the highest q values, around 0.49, with X11 having the lowest, under 0.005.</alt-text>
</graphic>
</fig>
<fig id="F7" position="float">
<label>FIGURE 7</label>
<caption>
<p>Results of interaction detection during 2000&#x2013;2020.</p>
</caption>
<graphic xlink:href="fenvs-13-1617829-g007.tif">
<alt-text content-type="machine-generated">Heatmap showing driving factors from 2000, 2010, and 2020. Each year displays a colored matrix with rows and columns labeled X1 to X12. The color scale ranges from red (higher q values) to blue (lower q values), indicating variations in factor relationships. The color key on the right represents q values from zero to 0.7320.</alt-text>
</graphic>
</fig>
</sec>
</sec>
<sec sec-type="discussion" id="s4">
<title>4 Discussion</title>
<sec id="s4-1">
<title>4.1 Driving factors of the ESV spatial differentiation</title>
<p>The link between land use and ecosystem services during urbanization is now a major research priority (<xref ref-type="bibr" rid="B3">Chen and Liu, 2021</xref>; <xref ref-type="bibr" rid="B40">Sarkar et al., 2024</xref>). As urbanisation progresses, reducing natural resources, such as farmlands, forests and water bodies, coupled with expanding construction land, will inevitably lead to ecological degradation, triggering environmental pollution, soil erosion, floods and droughts, and causing food insecurity. These interconnected problems further exacerbate a decline in ecosystem service functions (<xref ref-type="bibr" rid="B23">Li and Xie, 2024</xref>; <xref ref-type="bibr" rid="B33">Nolander and Lundmark, 2024</xref>; <xref ref-type="bibr" rid="B36">Pham and Lin, 2023</xref>). We observed that changes in the water body area in the HREEB were highly significantly positively correlated with the overall ESV, with the ESV equivalent of water bodies being 1,462.83 times that of artificial surfaces. Additionally, the areas of farmlands and green spaces, such as forests, shrubs and grasslands, exhibited positive correlations with the ESV, with their ESV equivalents being significantly higher than those of artificial surfaces. This underscores the critical role of blue and green spaces in sustaining and enhancing regional ecosystem services.</p>
<p>Policy interventions have been instrumental in mitigating the impact of LUC on the ESV (<xref ref-type="bibr" rid="B42">Tang et al., 2019</xref>). Since 2000, a series of policies aimed at land resource conservation and ecological restoration has implemented. For instance, between 2000 and 2002, the &#x201c;Several Opinions on Further Improving the Pilot Work of Returning Farmlands to Forests and Grasslands&#x201d; and the &#x201c;Overall Plan for the South-to-North Water Diversion Project&#x201d; were approved, significantly increasing the forest and water body areas. However, from 2005 to 2015, the reduction of water bodies and farmlands notably decreased the overall ESV. This trend underscores the growing tension between resource consumption and ecosystem service functions during urbanisation. In response, the 2016 &#x201c;Notice on the Comprehensive Delimitation of Permanent Basic Farmland and the Implementation of Special Protection&#x201d; policy was implemented to curb excessive reductions in farmland areas. While effective in stabilising farmland areas, it failed to address the decline in water body, forest and grassland areas, continuously decreasing the ESV. This suggests that isolated farmland-protection policies are insufficient to address broad ecosystem degradation, necessitating more comprehensive ecological conservation measures (<xref ref-type="bibr" rid="B31">Newbold et al., 2015</xref>).</p>
<p>LUC exerts profound and complex impacts on the ESV (<xref ref-type="bibr" rid="B2">Cao et al., 2021</xref>; <xref ref-type="bibr" rid="B60">Zhang P. et al., 2023</xref>), with climate change, terrain and land-cover types (e.g., NDVI) also closely linked to ecosystem service functions (<xref ref-type="bibr" rid="B4">Chen et al., 2023</xref>; <xref ref-type="bibr" rid="B20">Li et al., 2024</xref>; <xref ref-type="bibr" rid="B28">Liu et al., 2024</xref>). Through geographic detector model analysis, this study identified land-use type, NDVI and soil type as key drivers of ESV changes. Previous study on the driving forces of ESV in the Yangtze and Yellow River Basins found that land use type is the dominant factor in ESV changes (<xref ref-type="bibr" rid="B10">Fang et al., 2021</xref>). <xref ref-type="bibr" rid="B49">Wang Z. et al. (2023)</xref> found in their research on the HREEB that vegetation such as forests, grasslands, rice paddies, and water bodies had higher coverage and higher ESV. The above researches are basically consistent with the results of this study. Whereas DEM and distance from roads played secondary roles. Furthermore, slope, annual average temperature, annual rainfall, population density and total grain yield exhibited a synergistic effect, collectively amplifying their influences on the geographic distribution of ESV. This demonstrated that multi-factor interactions dramatically improve the explanatory capacity of ESV spatial patterns (<xref ref-type="bibr" rid="B59">Zhang et al., 2022</xref>). In the HREEB, areas with a high population density and low NDVI, typically located near urban centres, exhibit reduced ESVs. In contrast, regions with higher NDVI, often in rural areas with fewer artificial surfaces, displayed high ESVs. Notably, the Dabie Mountains and natural reserves, characterised by high NDVI and low population density, consistently demonstrated an elevated ESV. The soil-type distribution also significantly influenced vegetation growth and water-resource allocation (<xref ref-type="bibr" rid="B13">Gavrilescu, 2021</xref>; <xref ref-type="bibr" rid="B44">Valentin et al., 1999</xref>), thereby shaping the ESV spatial variability. Variations in soil types, as in the case of paddy fields south of the Huai River, dry farmlands to the north, Entisols (immature soils) and Luvisols (semi-leached soils) in mountainous areas, etc., directly affected vegetation distribution and ecosystem service performance. Therefore, the synergistic mechanism between land use type, NDVI, and soil type is complex and multidimensional, and the three jointly affect the ESV through direct and indirect pathways. Land-use change is the main driving force behind changes in ecosystem structure, which can reshape the composition and function of ecosystems by altering surface cover types. The degree of matching between land-use type and soil type can affect the potential for vegetation growth, thereby regulating the role of NDVI in ESV.</p>
</sec>
<sec id="s4-2">
<title>4.2 Impact of different land-use development scenarios on regional development</title>
<p>The simulation results for the three scenarios revealed distinct implications for regional development. Under the ND scenario, where land-use changes continued the 2010&#x2013;2020 trend without intervention, water body, forest and farmland areas were projected to decline, whereas artificial surfaces would expand. This scenario highlights the risks of unchecked urbanization as reducing high-ESV land types, such as forests and water bodies, significantly decreases the overall ESV. In the FPD scenario, the food security was maintained, but the disregard for ecological conservation led to a sustained reduction in the ESV. This underscores the necessity for not only safeguarding farmlands but also restricting the conversion of forests into farmlands and curbing artificial surface expansion.</p>
<p>By contrast, the EP scenario demonstrated a balanced approach, integrating ecological conservation with farmland protection. This scenario effectively safeguarded natural reserves, water bodies and forests while minimizing the conversion of farmlands into artificial surfaces. Consequently, it afforded the highest overall ESV among the three scenarios, illustrating that ecological protection and farmland development could be mutually reinforcing. Rational land-use planning and ecological conservation are thus essential for promoting sustainable regional development.</p>
<p>To achieve this balance, the government should rigorously implement a sustainable development plan for the HREEB. Strengthening management systems to simultaneously promote food security and ecological protection is critical. Specific measures include enhancing the protection of water resources, forests, wetlands and farmlands, improving ecological compensation mechanisms, promoting ecological agriculture and increasing public education and technological innovation to enhance resource-utilization efficiency and sustainable environmental management.</p>
</sec>
<sec id="s4-3">
<title>4.3 Limitations and future research</title>
<p>This study reveals the complex dynamic relationship between land use change and ESV in specific ecological barrier areas, particularly quantifying the enormous potential benefits of EP scenario. This challenges the traditional development model that solely pursues land use expansion, emphasizes the necessity of incorporating ESV into regional development assessments. Although some progress has been made in this study, there are several limitations. (1) Despite the ESV equivalents were revised twice according to the yield and price of crops (wheat, rice and corn) and factors such as NPP, NDVI and annual rainfall, the inherent diversity and spatiotemporal variability of ecosystems complicate ESV assessments. Therefore, future research should focus on refining the ESV equivalents, particularly across different spatiotemporal scales, to improve accuracy. (2) The PLUS model&#x2019;s Markov chain component predicts future LUC based on historical patterns without fully accounting for policy influences. Hence, future studies should integrate policy impacts into the model framework to enhance the reliability and precision of simulations. (3) Here is still a lack of research on the synergistic balance relationship between changes in different types of ecological service functions. In addition, the impact mechanism of ESV is extremely complex, and there is still broad exploration space, especially in the interaction and influence of driving factors. These future studies will further advance the role of ESV assessment in ecological conservation, national spatial planning, and green industry development.</p>
</sec>
</sec>
<sec sec-type="conclusion" id="s5">
<title>5 Conclusion</title>
<p>This study investigated spatiotemporal LUC, ESV and their driving factors of the HREEB. The main findings of this research are as follows:</p>
<p>During the study period, the land use structure of HREEB was mainly farmland, but its area showed a decreasing trend, while the artificial surface area significantly increased, and the water area experienced a change of first increasing and then decreasing. Secondly, based on scenario simulation, future land use changes have a significant impact on ESV: ESV is expected to decrease under ND and FPD scenarios, while EP scenarios can achieve a significant increase in ESV. Land-use types (espacially water bodies and artifical surfaces), NDVI and soil type were identified as the crucial drivers of ESV variation.</p>
<p>The research results indicate that protecting water bodies and basic farmland, and limiting artificial surface expansion are key to maintaining the ecological service functions of HREEB. Therefore, policies should prioritize: (1) Strict protection of water bodies and permanent basic farmland, and promotion of ecological agriculture; (2) Strictly control the disorderly expansion of cities; (3) Proactively construct ecological corridors and restore key ecosystems such as wetlands. These specific measures are directly based on the analysis of key ESV driving factors, aiming to optimize land use, achieve coordinated development of regional economy, society, and ecological protection, and promote green and sustainable development.</p>
</sec>
</body>
<back>
<sec sec-type="data-availability" id="s6">
<title>Data availability statement</title>
<p>The original contributions presented in the study are included in the article/supplementary material, further inquiries can be directed to the corresponding author.</p>
</sec>
<sec sec-type="author-contributions" id="s7">
<title>Author contributions</title>
<p>CL: Writing &#x2013; original draft, Writing &#x2013; review and editing. YW: Writing &#x2013; original draft. BQ: Writing &#x2013; original draft. YL: Writing &#x2013; original draft. LN: Writing &#x2013; original draft. HW: Writing &#x2013; original draft. LL: Writing &#x2013; original draft, Writing &#x2013; review and editing. JM: Writing &#x2013; original draft.</p>
</sec>
<sec sec-type="funding-information" id="s8">
<title>Funding</title>
<p>The author(s) declare that financial support was received for the research and/or publication of this article. This research was funded by the National Natural Science Foundation of China (Grant Number: 31971721), Natural Science Research Project of Universities in Anhui Province (Grant Number: 2024AH051725) and the Key Research Project of Huainan Normal University (Grant Numbers: 2023XJZD008 and 2023XJZD020).</p>
</sec>
<ack>
<p>The authors gratefully acknowledge Jie Yang and Xin Huang&#x2019;s research team for providing the land-use data, as well as the various institutions and collaborative platforms for supplying the natural, social and economic data utilised in this study.</p>
</ack>
<sec sec-type="COI-statement" id="s9">
<title>Conflict of interest</title>
<p>The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p>
</sec>
<sec sec-type="ai-statement" id="s10">
<title>Generative AI statement</title>
<p>The author(s) declare that no Generative AI was used in the creation of this manuscript.</p>
</sec>
<sec sec-type="disclaimer" id="s11">
<title>Publisher&#x2019;s note</title>
<p>All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.</p>
</sec>
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