基于PSR的区域生态安全评价——以重庆市渝北区为例

基于环境指标压力-状态-响应(PSR)概念模型,参考现有生态环境评价及生态安全评价方法,结合层次分析法构建评价指标体系,采用综合指数法对渝北区的生态系统进行综合评价,得到了其生态安全状态;并且通过聚类分析法分析了影响重庆市渝北区生态安全的27个单项指标,将其按照安全程度划分成四个层次.通过结果分析表明:渝北区生态安全状态处于"安全",影响其生态安全的主要因素为人口密度,农药化肥使用量和水土流失.最后依据评价结果及渝北区的现状,为重庆市渝北区的生态建设以及管理提供科学依据和指导.

Study on Assessment of the Regional Eco-security Based on PSR——As an example of Yubei District in Chongqing

Based on the concept model of environmental indicators:PSR (pressure-state-response), and referred to the current assessment methods of the ecological environment and ecological security evaluation, relating AHP to construct evaluation system,this article carried out a comprehensive evaluation on the ecological system of Yubei District by composite index method,and got a conclusion of the eco-security status of Yubei District. Then analyzing the 27 individual indicators influencing urban ecological security through cluster analysis,and they were divided into four levels. The result shows that: the eco-security status of Yubei District has been keeping secure,while population density,the use of pesticides and chemical fertilizers and soil erosion have been the main factors affecting its ecological security. Finally, based on evaluation results and status of Yubei District,this article puts forward some suggestions on the construction and the management of the ecological environment.