Abstract:
The Minjiang River Basin, locating in the transition zone on the western edge of the Sichuan Basin, is one of the typical ecological fragile zones in Southwest China. It is very important to explore the spatial and temporal evolution of its ecological environment vulnerability and its influencing factors to maintain the stability of the ecosystems in Sichuan Province. Using the pressure-state-response (PSR) model, remote sensing, meteorological and social statistics data were collected, and the weights were evaluated using the Critic Method-Entropy Value Method, and finally an ecological vulnerability evaluation system for the Minjiang River Basin was constructed. The spatial and temporal evolution characteristics of the ecological environment vulnerability in the Minjiang River Basin from 2012 to 2022 were analyzed, and the influencing factors of the ecological vulnerability of the basin were evaluated by using the geographic detector model. The results showed that: (1) During the study period, the overall vulnerability of Minjiang River Basin increased first and then decreased, and the severe and extremely vulnerable areas expanded first and then shrinked in the middle. Since 2017, the area of mild vulnerability had increased sharply with Chengdu as the center, and the ecological environment of the basin had improved significantly. And it had the spatial distribution characteristics of high-high concentration in the north and low-low concentration in the middle and south. (2) Under the condition of relatively stable policy factors, the main factors affecting the ecological vulnerability of Minjiang River Basin were the average annual precipitation and elevation, and the effects of climatic factors on ecological vulnerability was gradually enhanced. The research results could provide theoretical basis for ecological environment restoration and "Two Mountains" construction in Minjiang River Basin.