From 2009 to 2018, there was an increasing trend, but the environmental quality decreased from 2018 to 2021.
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Spatial heterogeneous relationship between environmental quality and human disturbances: a case study in Ili Valley, China.
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The sentences
Spearman correlation between elevation and environmental quality indicated a negative trend, consistent with lower vegetation cover and harsher climatic conditions at higher altitudes.
The proportions of cold spots were 46.18%, 30.02%, 31.62%, 33.85%, and 34.50%, respectively, showing a decreasing trend, and some cold-spot areas were transformed into hot spots.