Spatio-temporal evolution and driving forces of ecological quality in Qilian Mountains
Based on remote sensing Ecological Index(RSEI),the spatial and temporal changes of ecological quality in 6 Basins in Qilian Mountains from 2000 to 2020 were analyzed,and the effects of driving factors on ecological quality were analyzed by using geographic detectors.The results showed that:(1)RSEI was not sig-nificantly increased in Qilian Mountains in 21 a.The proportion of ecological quality remained unchanged,de-graded and improved was 78.19％,4.25％and 17.55％,respectively.The ecological levels of each tributary ba-sin generally exhibit a spatial distribution characterized by a gradual decrease from the upper reaches to the mid-dle and lower reaches.(2)The change of ecological quality in Heihe River Basin,Shule River Basin and Qaid-am Basin has a trend of"polarization",that is,the lower reaches of the basin,the core area of Qaidam basin and other areas with poor ecological quality have degradation risks,while the middle and upper reaches of the basin and the mountainous areas with medium and good ecological quality continue to improve.(3)The results of the geographic detector show that,in general,the explanatory power of natural-human interaction on ecological quality in each basin is better than that of nature-nature and humanity-human interaction.Climate and elevation play a core role in the change of ecological quality in each basin,while the influence of human factors is signifi-cantly different.Shiyang River and Heihe River basins,Qaidam Basin,Qinghai Lake and Huangshui River ba-sins are mainly affected by the proportion of primary,secondary and tertiary production respectively,while Shule River Basin is less affected by human factors.The results of this study can provide the decision basis for the sustainable development of Qilian Mountains.
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