Ecological Environment Security Analysis of Yushu Tibetan Autonomous Prefecture Based on GIS and RS

Yushu Tibetan Autonomous Prefecture is located in the Three Rivers Source area, which known as "water tower of China". However, due to restriction natural conditions, ecological environment extremely fragile and its self-recovery ability poor. Based on DPSIR concept model, this study collected socio-economic data 2000, 2005, 2010 2015, established a dynamic evaluation model security by using expert scoring method analytic hierarchy process. The weights each index are determined standardized analyze temporal spatial changes area. results show that change range less than 5%, there weak tendency develop both ends. In terms space, situation southeast better northwest, showing distribution characteristics insecurity early warning middle safety southeast.