Urban Ecological Safety Assessment Of Gansu

Currently, following with the increasing expansion of city scale and numberof,many cities plunge into plight,such as a rapid population growth, environmentalpollution, poor air quality, the plight of low life and production waste.Especially,theecological environment pollution problem has begun restricting the further healthyand sustainable development of cities. Gansu urban ecological problems are moreserious.understanding the problems of urban ecological security and then puttingforward counter measure will have an important effect sustainable envelopment ofcity in Chian.Based on systematic analysis of city ecological security in china,this appliedpressure-state-response (PSR) framework model, studied Gansu cities, selected theevaluation indicator, try to tried to put forward universal level into five grades,andthe city is divided into five ecological security evaluation level (extremely unsafe,insecure, criticality safety, safer, ideal safe): Select five Gansu cities (Lanzhou,Tianshui, Baiyin, Zhangye, Dingxi) city as example,and use three integrated flatbeloved method (fuzzy comprehensive evaluation method, principal componentanalysis, gray correlation method) in several cities in this ecological security levelhorizontal evaluation in2010.according to the results, analyzed the differences ofecological security level among these cities, tested the rationality of evaluationindicators,at the same time, compared these appraisement approaches and selectedfuzzy overall evaluation which was better than other appraisement approaches tomake vertical estimation of ecological security for Lanzhou city from2000to2011and analyzed the change trend of ecological security level of Lanzhou.According to adetailed analysis of ecological security level of Lanzhou, identify the limiting factors,and put forward pertinent counter measure to solve these problems.