长株潭城市群土地利用变化对生态系统健康影响的关键类型及阈值效应  

Exploring key types and threshold effects of land use change impact on ecosystem health in Changsha-Zhuzhou-Xiangtan Urban Agglomeration

作　　者：欧阳晓 陈键 魏晓 谢花林[4] 魏国恩 Ouyang Xiao;Chen Jian;Wei Xiao;Xie Hualin;Wei Guoen(School of Engineering Management,Hunan University of Finance and Economics,Changsha 410205,Hunan,China;Key Laboratory of Natural Resources Monitoring and Supervision in Southern Hilly Region,Ministry of Natural Resources,Changsha 410029,Hunan,China;College of Urban and Environmental Sciences,Hunan University of Technology,Zhuzhou 412007,Hunan,China;School of Applied Economics,Jiangxi University of Finance and Economics,Nanchang 330013,Jiangxi,China;School of Resources and Environment,Nanchang University,Nanchang 330031,Jiangxi,China)

机构地区：[1]湖南财政经济学院湖南省经济地理研究所,湖南长沙410205 [2]自然资源部南方丘陵区自然资源监测监管重点实验室,湖南长沙410029 [3]湖南工业大学城市与环境学院,湖南株洲412007 [4]江西财经大学应用经济学院,江西南昌330013 [5]南昌大学资源与环境学院,江西南昌330031

出　　处：《地理科学》2024年第11期1946-1954,共9页Scientia Geographica Sinica

基　　金：国家自然科学基金项目(42201230);湖南省自然科学基金项目(2024JJ5060);自然资源部南方丘陵区自然资源监测监管重点实验室开放基金项目(NRMSSHR2024Y05)资助。

摘　　要：人类活动导致土地利用发生变化,对生态系统健康产生了重大影响,探讨土地利用变化对生态系统健康的非线性关系,对于国土空间优化调控具有重要意义。本研究以长株潭城市群为研究对象,基于网格尺度构建了活力–组织–服务生态系统健康评估框架,运用随机森林模型和分段线性回归模型,揭示2000—2020年城市群生态系统健康时空变化规律,并识别影响生态系统健康的关键土地利用类型及其阈值。研究结果表明:(1)研究期间,建设用地显著增加,其占比增长了8.10%,主要由耕地和林地转化而来。(2)生态系统健康时间上呈现出先下降后上升的趋势。空间上具有显著的空间异质性,与土地利用类型密切相关,不同等级呈现集聚分布。(3)耕地、林地和建设用地为影响生态系统健康的关键土地利用类型。关键土地利用类型对生态系统健康的影响存在阈值,当耕地占比≥1.98%,林地占比≥7.58%,建设用地占比≤19.80%时,生态系统健康能达到中等水平。Human activities have led to land use changes,greatly affecting ecosystem health.Exploring the non-linear relationship between these changes and ecosystem health is vital for the superior regulation of territory spatial.Existing studies insufficiently addresses how land use structure affects ecosystem health and whether different land use types have threshold effects on ecosystem health,and it is difficult to reflect the role of key land use types in ecosystem health.In this study,the Changsha-Zhuzhou-Xiangtan Urban Agglomeration is the study subject with gird scale as units.And we built a ecosystem health assessment framework to reveal the spatial-temporal patterns of ecosystem health changes in the study area from 2000 to 2020,and we used random forest and piecewise linear regression model to identify the threshold effect of ecosystem health on the response to land use changes.Results are as follows:1)Over the study period,built-up land significantly increased with its share escalating by 8.10%,mainly due to conversion from cropland and forest land,with the conversion rates being 11.87%and 6.83% respectively.Construction land expansion leads to loss of ecological and grain production land.2)Ecosystem health level showed a decline then an upward trend over time.Spatially,spatial heterogeneity is significant,tied to land use types,with different levels showing clustered distribution.Ecosystem vigor,ecosystem organization,and ecosystem services showed clear differentiation trends.3)Cultivated,forest,and construction lands are pivotal for ecosystem health,with thresholds affecting it.Ecosystem health reached medium levels with cropland at or above 1.98%,forest land at or above 7.58%,and construction land at or less than 19.80%.Exceeding these thresholds altered the impact trends on ecosystem health.Cultivated and forest lands benefited ecosystem health,while construction land expansion harmed it.Thus,the structure and layout of different land use types should be reasonably determined to promote the balance of ecolo

关 键 词：生态系统健康 土地利用变化 阈值效应 长株潭城市群 

分 类 号：X24[环境科学与工程—环境科学]