基于PSR模型的三峡库区生态经济区土地生态安全评价

针对三峡库区生态经济区土地资源的特点及所面临的主要问题,基于PSR框架模型的发展,构建了一套评价指标体系.采用熵权赋权法确定权重,运用土地生态安全综合模型,对该区域2003~2006年的土地生态安全综合指数进行了计算.结果表明,区域土地生态安全综合指数由2003年的0.134(敏感级)升高至2006年的0.269(临界安全级),整体生态安全状态呈好转趋势,土地所受的生态压力整体上有所加大.现有土地生态安全状况的改善主要依赖于对现有土地生态问题的治理.现阶段土地的生态压力依然严峻.对2003~2006年的土地生态安全变化进行分析显示,土地生态安全综合状况已进入快速改善阶段.

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.