基于PSR模型的磁湖流域生态系统健康评价

Ecosystem health assessment of Cihu Lake Basin based on PSR model

基于压力-状态-响应(PSR)评价模型,从压力指标、状态指标、响应指标3个方面,构建磁湖流域生态系统健康评价的指标体系.利用熵权法计算各指标的权重,并用生态健康评价指数(CEI)评价磁湖流域生态系统健康状况.结果表明:1)磁湖流域2014—2018年CEI指数分别为0.43、0.45、0.45、0.46、0.44,均处于一般健康状态;2)各个子系统贡献大小分别为:状态S子系统>压力P子系统>响应R子系统,其中状态S子系统权重达到51.83%,表明其对磁湖流域生态健康评价的作用最为显著;3)对各评价指标进行分析,得出人口压力过大、湖泊氮、磷含量过高以及水资源利用效率过低等问题是影响磁湖流域生态健康的主要因素.

Based on the pressure-state-response(PSR)evaluation model,the indicator system of ecosystem health assessment in Cihu Lake Basin was constructed from three aspects:pressure index,state index and response index.The weights of each index were evaluated by entropy weight method,and the ecosystem health status of Cihu Lake Basin was evaluated by CEI method.The results showed that:firstly,the evaluation indexes of Cihu Lake Basin from 2014 to 2018 were 0.43,0.45,0.45,0.46 and 0.44 respectively,which were in the general healthy state.Secondly,the proportion of each subsystem was as follows:State“S”Subsystem>Pressure“P”Subsystem>Response“R”subsystem.The weight of state“S”Subsystem was fifty-one and point eight three percentage,which had the most significant effect on the health evaluation of Cihu basin.Thirdly,analyzed each evaluation index,the main factors affecting the ecological health of Cihu Lake Basin were overpopulation pressure,high nitrogen and phosphorus contents and low water use efficiency.