LAUSR

Ecological corridors play a key role in promoting the flow of ecological processes, guaranteeing ecological function services and maintaining biodiversity. Based on ecological sensitivity and ecological service values, ecological corridors in typical karst areas of Ningyuan County were constructed to lay the foundation for ecological environmental protection and land development and utilization in the county. Based on the current land use situation in 2020, the ecological source sites were identified by the combined results of ecological sensitivity evaluation and ecosystem service value analysis, and then potential corridors were generated based on the minimum cumulative resistance model (MCR) and the minimum cost path method, and key corridors were identified by the gravity model. The results show that (1) the areas exhibiting strong sensitivity are concentrated within regions characterized by better ecological environment quality; the ecosystem service value and ecological sensitivity have a similar distribution pattern, and those with high ecological value are mainly distributed in areas with better habitat quality such as woodlands and along water systems. (2) The total area of ecological source land in Ningyuan County is 879.14 km², accounting for 35.15% of the county area, mainly distributed in the south and north of the county. (3) There are nine ecological corridors in Ningyuan County, which are radially distributed in a spider-web manner, five important ecological corridors and four general ecological corridors, with total lengths of 96 km and 120.87 km, respectively.