Regional land ecological security evaluation in the case of Chongqing Three Gorges Reservoir ecological economy area based on the PSR model

Based on the analysis of the characteristics of land resources and problems of ecological economic zone in the Three Gorges Reservoir Area,the study established a set of evaluation index system with the help of the development of P-S-R framework model.Entropy weight method used to determine the weight,and the integrated model of land ecological security used to calculate the integrated index of land ecological security in this area in 2003～2006.Comprehensive index of regional land ecological security increased from 0.134 in 2003 to 0.269 in 2006,and the land ecological security was in a state of a sensitivity level in 2003,and critical safety level in 2006.The overall eco-security situation was improving,and the ecological pressure on the whole land was increased,and the improvement of land ecological security mainly depended on the handling of land ecological problems.The land ecological pressure was still severe.The changes of land ecological security in 2003～2006 revealed that the integrated situation of land ecological security has entered a period of rapid improvement.