Landscape ecological risk assessment and geographic exploration in the Anhui section of the Yangtze River Basin from 1995 to 2020
To explore the spatiotemporal characteristics and changing trends of landscape ecological risks in typical regions of the Yangtze River Basin,and to reveal the spatial heterogeneity of ecological risks and their in-fluencing factors,a case study of the Anhui section of the Yangtze River Basin from 1995 to 2020 was conducted.An ecological risk model was constructed,and ecological risk assessment,spatial distribution characteristics,and driving force analysis of the Anhui section were conducted based on spatial data exploration and geographic de-tectors.The results indicated that between 1995 and 2020,the landscape pattern characteristics of the Anhui sec-tion of the Yangtze River Basin underwent significant changes,with landscape shape becoming more irregular,land-scape fragmentation decreasing,and an overall trend towards diversification and heterogeneity.The average ecological risk values for the Anhui section during the study period from 1995 to 2020 were 0.221 8,0.226 9,0.243 5,and 0.220 0,respectively,showing an initial increasing trend followed by a decline.Spatially,areas with higher and high risks were mainly concentrated in the urban built-up areas within the basin,exhibiting patchy distribution.The global Moran's Ⅰ in-dex values for landscape ecological risk in the study area in 1995,2000,2015,and 2020 were 0.433,0.558,0.475,and 0.423,respectively,indicating significant positive spatial correlation between ecological risk values and Moran's I index values.Local spatial autocorrelation analysis revealed that the evaluation units were primarily characterized by"low-low"and"high-high"agglomeration in the LISA spatial cluster map.The geographic detector analysis showed that the order of influence of each driving factor was as follows:population density＞GDP＞precipitation＞soil type＞DEM＞NDVI＞aspect＞slope.The interaction effects between any two influencing factors were significantly higher than the individual effects on the spatial heterogeneity of ecological risk.The interaction between popula-tion density and precipitation had a q value of 0.542 1,indicating the strongest explanatory power for the spatial heterogeneity of ecological risk in the study area.The research findings can provide a theoretical basis and deci-sion support for ecological risk regulation and restoration in the Anhui section of the Yangtze River Basin.
landscape patternecological risk assessmentgeographical detectorAnhui section of the Yang-tze River Basin
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