利用MCR模型和生态安全评价构建区域生态安全格局OA

To assist in achieving carbon neutrality and peak carbon emissions,as well as the overall layout of ecological civilization construction,and to improve the quality of ecological environment,taking Ganquan County,Yan'an City,Shaanxi Province for example,we analyzed the evolution of land-use structure in 2010 and 2020 using GIS analysis and dynamic degree model,and evaluated the ecological security level of Ganquan County by combining landscape ecological security evaluation model and spatial autocorrelation model.Then,we constructed the resistance surface index system in 2020,and used the minimum cumulative resistance model to construct an ecological security pattern.Research shows that over the past decade,cultivated land and grassland have shown a downward trend,while forest and construction land have shown an increasing trend.The high ecological security areas in Ganquan County have mainly been distributed in the western and southwestern regions,with an increase of 5 147 ha.The proportion of higher ecological security areas has reached 25%,while the areas of lower and low security ecological security areas have decreased significantly,and the spatial distribution of ecological security is mainly concentrated in high-high and low-low clusters.We constructed an ecosystem with a source area of 44 166 ha,21 ecological corridors,and 42 nodes,forming a point line surface connected ecosystem,which could provide reference for regional sustainable development and ecological civilization construction.