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《Journal of Arid Land Resources and Environment》 2012-08
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Ecological security evaluation of grassland based on combined weight on principle of relative entropy: A case of Yellow River water source areas of Gannan

HOU Chengcheng,ZHAO Xueyan,ZHANG Li,JIANG Jinde,ZHAO Minli,LI Jianbao(College of Geography And Environment Science,Northwest Normal University,Lanzhou 730070,P.R.China)  
Focusing on the P-S-R model and based on Combined Weight using relative Entropy principle,an integrated assessment model was constructed to assess the regional ecological security in the Yellow River Water Supply Areas of Gannan.In this model,the indexes weights were computed by using Analytic Hierarchy Process and entropy principle,and the combination weight can be synthesized according to minimum relative information entropy principle.In order to realize the evaluation function of single index evaluation process,a new evaluation method of single index was proposed by using attribute recognition model.And then the new evaluation method,named AR-CWE for short,was established with the support of combined weight and the single index evaluation.The results showed that the whole situation of ecological security of Gannan was bad;the towns whose ecological security was the worst were the pure pasturing area;the towns whose ecological security was worse were the semi-planting-pasturing area;the towns whose ecological security were generally the agricultural area.Through the analysis of ecological security situation in the Yellow River water source areas of Gannan,we found that the changes of annual air temperature and annual precipitation,the difference way of farmer's income,the educational level of herds,the overgrazing and the rate of grassland degradation were the main factors which had a great effect on the ecological security in the Yellow River water source areas of Gannan.
【Fund】: 国家自然科学基金项目(41061051 91125019);; 国家社科基金项目(10CYJ014);; 教育部科学技术重点项目(210231);教育部新世界优秀人才支持计划(NCET2011)资助
【CateGory Index】: X826
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