Ecological Risk Assessment and Driving Force Analysis of Urban Landscape in Dongting Lake Area:Take Changde City and Yiyang City as Examples
Using remote sensing images from 2000,2010,and 2020 as the main data source,a landscape ecological risk assessment model was constructed to study the spatiotemporal changes and spatial patterns of land use and landscape ecological risks in Changde and Yiyang cities.The main findings are:The land use types of both cities are mainly forest and farmland,which have decreased in the past 20 years,while the area of built-up land has increased significantly;the landscape indices of both cities show similar changes,with the separation and fragmentation indices of built-up land,grassland and water landscape types being high,while those of farmland and forest landscape types being low;the separation index of farmland and forest landscape types is relatively low,so is the fragmentation index;the high and moderate risk areas of both cities are distributed in the plain areas near the lake and the urban built-up areas,while the low and very-low-risk areas are distributed in the forest areas under their jurisdiction;there is a significant positive spatial correlation in the spatial distribution of landscape ecological risk.
land uselandscape ecological risk assessmentlandscape patternlandscape indexDongting Lake
NETL
NSTL
万方数据
