基于熵组合权重属性识别模型的草原生态安全评价——以甘南黄河水源补给区为例

Ecological security evaluation of grassland based on combined weight on principle of relative entropy: A case of Yellow River water source areas of Gannan

基于P-S-R模型,分别采用层次分析法和信息熵法确定指标权重,利用最小信息熵原理综合为组合权重;采用属性识别模型进行指标评价,建立草原生态安全评价的熵组合权重属性识别模型(AR-CWE)。结果表明:甘南黄河水源补给区的整体草原生态安全状况处于较差状态;草原生态环境恶化的乡镇集中于纯牧区,较差乡镇集中于半牧区,而较好的乡镇则集中于农区;通过对各乡镇的草原生态安全状况分析,发现降水和气温变化、人口素质、农牧民收入方式、牲畜超载率和草原退化率是影响各乡镇草原生态安全的主要因素。

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.