基于生态系统服务的青海湖流域生态风险评估及其空间异质性影响因素分析OA北大核心CHSSCDCSTPCD

The Qinghai Lake Basin is the"climate regulator"and"air humidifier"of northwest China.The implementation of ecological risk management is of great significance for the ecological protection and sustainable development of the Qinghai-Tibet Plateau and even the western China.Based on the InVEST model,this study quantitatively four ecosystem services in the Qinghai Lake Basin in 2005,2010,2015 and 2020,which included water yield,soil retention,carbon sequestration,and habitat quality.Then,the Entropy-weighting TOPSIS method was used to construct a regional ecological risk index related to the relative loss of ecosystem services.Moreover,we analyzed the influence of natural-social elements on the spatial heterogeneity of ecological risk in the Qinghai Lake Basin based on geographical detector and geographically weighted regression.The results showed that:(1)from 2005 to 2020,water yield,soil conservation,habitat quality and carbon storage in the Qinghai Lake Basin showed fluctuating trend of increase with the growth rate of 10.17%,18.36%,9.84%and 3.47%,respectively.Moreover,the areas with high value of each distributed in the upper reaches of rivers and in forest areas with high vegetation coverage.(2)The ecological risk of the Qinghai Lake Basin was high in 2005-2020.However,it showed a fluctuating trend of decline.The high-risk areas were mainly in the lake,around the lake,Buha River valley and northwestern part of the basin.(3)The spatial pattern of ecological risk in the Qinghai Lake Basin was mainly affected by slope and Digital Elevation Model(DEM).However,the influence of human interference level was increased year by year.And the factors′explanatory after the interaction was significantly higher than that of single.(4)The direction and intensity of the major drivers of ecological risk had obviously spatial differentiation characteristics.Among them,slope showed positive promotion effects.Mean annual temperatures showed negative effects.Normalized Difference Vegetation Index(NDVI)and human disturbance had both positive and negative effects,but the positive effects predominates.This study has implications for the control of ecological risks in the Qinghai Lake basin and the protection of the plateau ecological environment.