Xi'an Land Ecological Security Assessment Research

Land resources is the material base for human beings' existence and development.With the aggravation of human beings' activity and land resources' using intensity,ecological environment of land resources is severely destroyed.As one important aspect of ecological security,research of the land ecological security is also the frontier of research into sustainable use of land resources.But the research of land ecological security is at the primary phase,correlative research is not any more,and the theory of land ecological security evaluation is in discuss, evaluation index system and means are difficult on study.This paper takes xi'an as study area,on the basis of analysis of using situation of land resources and eclolgical environment in xi'an,based on the "P-S-R" conceptual framework model,established a index system which including three systems:land ecological power,land ecological state and land ecological response,and 20 indexes.Adopting entropy weight and synthesis evaluation method established the land ecological security evaluation model.And it uses the model to evaluate and analyze the land ecological security status in each country of xi'an.On the basis of evaluative results,providing measures from promoting the sustainable use of land resources and maintaining ecological security.Main conclusions of this paper are as following:(1)The various counties of Xi'an in 2006, the land ecological security of Lan'tian county is the best,Bei'lin county is the worst;the difference between main urban and suburban is large,the land ecological security of suburban is in general better than main urban'.(2) 1996-2006,in the countries of Xi'an,except Xin'cheng and Bei'lin,the values of land ecological security were rising in largely, land ecological security situation has been improved.The increasing of Lan'tian,Zhou'zhi and Hu country is the most,land ecological security is the largest improved.(3)1996-2006,the land ecological security of Xi'an was rising in largely,but still in the sensitive class,which is early warning status,the land ecological security situation need to be further improved.The land ecological security situation is the worst in 1997,the best in 2003.(4)As the major ecological problems of Xi'an in present,it provides the measures from nature,economy and society to promote the sustainable using of land resources and maintain the ecological security.