Abstract:
The scientific construction of regional ecological security pattern in the context of rapid urban expansion is one of the effective ways to alleviate the contradiction between ecological protection and land development. As a border city in Southwest China, Lincang City, Yunnan Province, with its unique topography and rich biodiversity, occupies an important position in the basic ecological security pattern of "three screens and two belts" in Yunnan Province. Taking the city of Lincang as an example, we use the InVEST model to assess the ecosystem services and describe the vulnerability of the area through abiotic factors such as topography and vegetation cover, and combine the results of the two parts to identify areas of high ecological conservation importance as ecological source areas, and then use the Minimum Cumulative Resistance model to identify ecological corridors, so as to construct the ecological security pattern of the area and propose ecological security protection strategies. The results show that the total area of ecological source area in Lincang is 8804.25 km
2, accounting for 37.27% of the city's total area, mainly distributed in the Lancang River Basin of Fengqing County, the west of Zhenkang County, Gengma County, Cangyuan County and the Daxueshan area of Yongde County; the total length of ecological corridors is 2151.96 km. Based on the results, we propose the "one screen, one belt, one axis and multiple cores" ecological security pattern optimization, which provides scientific guidance for the configuration of "mountains-rivers-forests-farmlands-lakes-grasslands" elements and ecological environment construction in the new round of national land space planning in Lincang.