[Spatial-temporal Evolution of Landscape Ecological Risk and Driving Forces in the Plateau Lake Basin of Northwest Yunnan].

Scientific assessment of landscape ecological risks and identification of driving factors in the plateau lake basin of Northwest Yunnan are the key to prevent and resolve ecological risks and protect basin ecosystems. The plateau lake basin of Northwest Yunnan, which is ecologically sensitive and vulnerable and facing the ecological threat of unreasonable development, was selected as the research area. Based on land use data, the spatial-temporal evolution characteristics of landscape ecological risks in the plateau lake basin of Northwest Yunnan in the past 15 years were analyzed, and the driving factors were identified from the whole and local areas with geographical detectors. The results show that： ① The main land use types in the plateau lake basin of Northwest Yunnan were farmland, woodland, and grassland, and there were several mutual transformations among them. ② From 2005 to 2020, the landscape ecological risks in the study area were mainly medium risk, low-medium risk, and medium-high risk, and the high risk area accounted for a relatively small proportion. The high risk areas were mainly concentrated in the south of the basin, the medium-high risk areas were mainly distributed around the high risk areas, the low-medium risk areas were mainly distributed around the Lugu Lake, the southwest of Chenghai Lake, and the northwest of Erhai Lake. Most of the change of risk grade was the transformation of adjacent grade. ③ Locally, the towns with a high risk area accounting for more than 50% were mainly distributed around Erhai Lake and Chenghai Lake. ④ The evolution of landscape ecological risk was influenced by several factors, among which natural factors were the most important, and the interaction between most of the factors continued to improve with the passage of time. Locally, elevation and average annual temperature were important factors affecting the evolution of regional landscape ecological risk.