Ecological Function Zoning of the Pearl River Source Area Based on Ecosystem Service Clusters
Ecosystem service clustering is an important means for managing regional ecological func-tion zoning,and ecological function zoning can provide theoretical support and technical guidance for regional land use pattern optimization,biodiversity conservation,ecological restoration,and precise management and control of land resources.The source area of the Pearl River,with karst geology is ecologically fragile and an important source of Asian rivers.It is also an important part of the ecolog-ical barrier in southern China and a key area for sustainable development and ecological civilization construction.In this study,based on the In VEST model and a food supply model,we evaluated five important ecosystem services provided by the Pearl River source area:habitat quality,soil retention,water supply,carbon storage,and food provision during the decade 2010-2020.The evaluation proce-dure involved elucidating spatio-temporal distribution patterns,identifying ecosystem service clusters,ecological function zoning,and identifying factors that influence ecosystem service clusters.First,a contour coefficient algorithm was developed on a Python platform and the optimal number of clusters was determined.Then K-means cluster analysis was carried out using SPSS software to identify eco-system service clusters.Finally,based on a XGBoost machine learning algorithm,the factors influenc-ing ecosystem service clusters were identified and interpreted using the SHAP model interpretation method to measure the contribution each predictor in the machine learning model.Results show that:(1)Ecosystem services provided by the Pearl River source area tended toward degradation and their overall value decreased during the 10-year study period.High-value areas of habitat quality,carbon storage and water supply occupied most of the Pearl River source area.Soil conservation in the north-ern and southern areas were higher than that in the central area,and the distribution of food supply was generally consistent with the land use.(2)The proportion of townships in ecological conservation areas continuously increased and is primarily distributed in the mountainous and hilly regions in the north and southeast of the source area.The proportion of developed urban area,located in Qilin Dis-trict in the central part of the source area has not changed.The proportion of townships in the supply service area changed little and is distributed in the central and southwestern plains of the source area.(3)Slope,gross domestic product(GDP)and anthropogenic impact index had large impacts on the formation of ecosystem service clusters,and natural environmental conditions remained as the deci-sive factors for ecosystem services.Ecological function zoning is important for achieving sustainable socio-economic development and constructing an ecological civilization in the source area of the Pearl River.
ecosystem service clustersInVEST modelK-means cluster analysisecological function zoningPearl River source area
万方数据
维普
