基于PSR模型的黑河中游湿地生态系统健康评价

Ecosystem health evaluation of wetland in the middle reaches of Heihe river based on PSR model

为从时空尺度上对黑河中游湿地生态系统健康状况进行定量评价,基于PSR(Pressure-State-Response)模型,从压力、状态、响应3个目标层选取11个指标构建指标体系。采用层次分析法(AHP)确定各指标权重,并结合综合指数法对黑河中游近18年的湿地生态健康状况进行了整体评价。结果表明,黑河中游湿地的健康状况在2000、2005、2011、2018年分别为差、良好、良好和一般的等级;其中,肃南裕固族自治县明花乡的湿地生态系统状况在这4年均处于差的水平;状态层的影响性最大(0.650),而响应层最小(0.120);归一化植被指数(NDVI)、人类干扰指数和景观多样性指数(SHDI)是影响该区域湿地生态系统健康状况的主要因素。

In order to quantitatively evaluate the health status of the wetland ecosystem in the middle reaches of Heihe river on a spatialtemporal scale,based on the PSR(pressure-state-response)model,11 indicators were selected from 3 target layers of pressure,state and response to build an index system.The AHP method was used to determine the weight of each index,and combined with the comprehensive index method,the ecological health of the wetland in the middle reaches of Heihe river in the past 18 years was evaluated.The results showed that the health status of the middle reaches of Heihe river was poor,good,good and average in 2000,2005,2011 and 2018,respectively.Among them,the wetland ecosystem in Minghua township of Yugur autonomous county of Sunan,which was at a poor level in these four years.The state layer with the most influence(0.650),while the response layer was the smallest(0.120).Normalized difference vegetation index(NDVI),human disturbance index and landscape diversity index(SHDI)were the main factors affecting the health of wetland ecosystem in this region.