[Evolution Pattern and Driving Forces of Landscape Ecological Risk in the Nujiang River Basin （Yunnan Section）]

The assessment of landscape ecological risk provides a comprehensive overview of the alterations and attributes of regional landscape structures, serving as a crucial reference for evaluating regional ecological security. The landscape ecological risk assessment model and trajectory analysis method were employed to investigate the spatial-temporal change patterns and pathways of landscape ecological risk in the Nujiang River Basin （Yunnan section）, while also examining the driving factors from the perspectives of physical geography and socio-economic conditions. The findings indicated that： ① The predominant landscape types in the Nujiang River Basin during the study period were forest, grassland, and farmland. Furthermore, there was a notable frequency of conversion among these three land types. ② The landscape ecological risks within the study area were mainly low risk and low-medium risk. High-risk areas were primarily concentrated in Longyang district of Baoshan City along the lower reaches of the Nujiang River, as well as in the transitional region from Xizang to Yunnan located in the northern part of the study area. ③ The more ecological risk level of each landscape turned to the risk area adjacent to its own level and the smaller cross-risk level transformation area. The area of the stable change trajectory was larger, and the area of the rising fluctuation was slightly larger than that of the decreasing fluctuation. ④ The single-factor detection showed that physical geographic factors exerted a more substantial influence on landscape ecological risk in the study area, with the impact of each driving factor exhibiting a declining trend. Furthermore, interaction analysis indicated that the interplay between physical geography and socio-economic factors significantly intensified at the outset of the study, while in the middle and later stages, physical geographic factors assumed a predominant role. The landscape ecological risk in the Nujiang River Basin （Yunnan section） has been relatively stable in the past 20 years, and the explanatory power of physical geography factors for the landscape ecological risk of the study area was stronger.