关键词: 生态环境脆弱性, 空间主成分分析, 土地利用, 川西北江河源区

Abstract: The purpose of this paper is to understand the spatiotemporal change characteristics of ecological environment vulnerability and the impact of land use on ecological environment vulnerability. Remote sensing（RS）,geographic information system（GIS）,spatial principal component analysis（SPCA） were used to establish the evaluation index system and evaluation model to evaluate ecological environment vulnerability from 2000 to 2015,and analyze the relationship between ecological environment vulnerability and land use. The results showed that,the vulnerability of the ecological environment in the study area showed a trend of improvement,and the area of moderate and severe fragile continued to decrease in the study time scale. The areas with serious ecological fragility in the study area were mainly distributed in the eastern Ruoergai county and the wester Shiqu county. The building land, unused land and cultivated land had a great influence on the deterioration of environmental vulnerability. It is pointed out that ecological protection policies such as returning cultivated land to forests and returning grazing land to grassland in the northwest Sichuan river source area have been effective,but still need to increase the environmental management.

Key words: ecological environment vulnerability, spatial principal component analysis, land use, northwest Sichuan river source area