基于PSR模型的长沙市土地资源生态安全评价

Evaluation on the Land Ecological Security of Changsha City Based on the PSR Model

基于PSR(压力-状态-响应模型)构建土地生态安全评价指标体系,运用熵值法以及改进的灰色关联分析法求出整体土地生态安全指数,对"十二五"期间长沙市的土地生态安全进行评估,结果表明:长沙市的土地生态安全在2011—2015年整体上处于较安全状态。其中,长沙市土地生态安全整体呈上升状态,趋向安全状态;从子系统来看,压力、状态和响应系统也呈波动上升趋势发展,波动幅度较大;森林覆盖率、生活垃圾无害化处理率、自然保护区面积以及工业固体废物综合利用率是影响长沙市土地生态安全的主要因素。

This paper constructs the evaluation index system of land ecological security based on PSR （pressure-state-response model） and applies entropy method and modified grey correlation analysis method to calculate the security index of the whole land ecology.This paper also conducts the evaluation on the land ecological security of Changsha City during the 12th Five-Year Plan.The result reveals that the land ecological security of Changsha City between 2011 and 2015 is in a relatively secure state.Overall, the land ecological security of Changsha City is presenting an increasing trend and inclines to a secure state;from the perspective of subsystem, the pressure, state and response system are all presenting a fluctuant rising trend and the fluctuating range is relatively great;forest coverage rate, innocuous treatment rate of household garbage, area of nature reserve and comprehensive utilization rate of industrial solid wastes are the main factors influencing the land ecological security of Changsha City.