Security Evaluation of Land Ecology in Changsha

Abstract

Based upon the "pressure-state-response" concept frame model, an index system including three project layer indicators had been established for the evaluation of local land eco-security. The project layers were selected as land ecological pressure, land ecological status and land ecological response. 17 indicators had been adopted to describe the status of the criteria layers. The index weight was determined by analytic hierarchy process and entropy weight method. Then the value of local land eco-security can be obtained by composite index method. During the analyses, Changsha area including 5 districts and 4 counties was taken as an example. The results show that the land eco-security value in the area in 2010 is among 0.5419~0.6876. It has been found that there exists a certain gap between the main urban area and counties, and the status of land eco-security in each county is generally better than that in the main urban area.