Abstract: Maintaining ecological security of county-level landscape is a key way to promote high-quality economic development of plateau area in the new era, and is of great significance for improving the well-being of residents and realizing sustainable development of plateau valley counties. In this study, Yongping County, Dali Prefecture, Yunnan Province was selected as the research area. Based on the principles of landscape ecology, a landscape ecological risk assessment model was established with the landscape index method, and the InVEST-MSPA-Conefor analysis method was used to determine ecological sources. The Minimum Cumulative Resistance model and Gravity model was employed to extract ecological corridors. Hydrological analysis tools were used to extract radiation channels. Ecological strategic nodes and ecological breakpoints were identified. The resistance threshold method was used to identify key areas for protection. Finally, the ecological security pattern of Yongping County was constructed. The results showed that landscape ecological risk of Yongping County in 2020 presented a spatial pattern of “low in the northwest, southwest, and northeast” and “high in the central south, east, and west”. The low ecological risk areas had good vegetation coverage, less disturbance from human activities, and good ecological environment quality. The high ecological risk areas were located in the contiguous distribution area of cultivated land and construction land, and ecological environment quality was relatively poor, which was the key area for ecological construction. We identified 14 ecological sources, 102 general corridors, 18 key corridors, 138 radiation channels, 62 ecological strategic nodes, 88 ecological break points, and 6 key protection areas, which together constituted the ecological security pattern of Yongping County. Our results had important guiding significance for the ecological security construction of Yongping County.

Key words: landscape ecological risk, ecological security pattern, plateau valley, Yongping County