基于PSR模型的甘南尕海湿地生态系统健康评价

Health Assessment of Gahai Wetland Ecosystem of South Gansu Province Based on PSR Modeling

[目的]对甘南尕海湿地生态系统健康进行综合评价,为该湿地科学管理和可持续发展提供科学依据。[方法]运用PSR数学模型,从压力、状态和响应3个方面选取18个评价指标来构建尕海湿地生态系统健康评价体系,并采用层次分析法(AHP)确定指标权重,分析生态系统健康指数。[结果]尕海湿地生态系统健康指数为0.5881,属于亚健康状态;压力子系统健康指数为0.7332,属于健康状态;状态和响应子系统健康指数为0.4893和0.5679,二者都属于亚健康状态。[结论]全球气候变化和人为活动干扰使尕海湿地生态系统健康状况受到严重威胁,迫切需要科学地保护和修复措施,提高湿地管理水平。

[Objective]The ecosystem health of Gahai wetland of South Gansu Province was comprehensively evaluated in order to provide a scientific basis for the management and sustainable development of the wetland.[Methods]Using PSR mathematical model,18 evaluation indexes were selected from three aspects including pressure,state and response,to construct the health evaluation system of Gahai wetland.Analytic Hierarchy Process(AHP)was used to determine the weight of indicators and to analyze the ecosystem health index.[Results]The health index of the Gahai wetland ecosystem was 0.5881,which belonged to the sub-health state,and the health index of the pressure subsystem was 0.7332,which belonged to the health state.The health indexes of the state and the response subsystem were 0.4893 and 0.5679,respectively,both of which belonged to sub-health states.[Conclusion]Global climate change and human disturbance have seriously threatened the health of the wetland ecosystem in Gahai.wetland Scientific protection and restoration measures are urgently needed to improve the level of wetland management.