Extant literature has proven that the arid and semi-arid climate in northwestern China exhibits a clear trend of both warming and humidification 18 .
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Response of altitudinal vegetation belts of the Tianshan Mountains in northwestern China to climate change during 1989-2015.
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In general, the climate in the west and the north parts of the Tianshan Mountains showed a trend of “warm and humid”, but the climate in the south and the east showed a trend of “warm and dry” 31 reported the following: the whole Tianshan Mountains present a warm and humid trend (1960–2016); the annual average temperature increase rate in the north slope is greater than that in the south slope; and annual precipitation has increased significantly in the north and west, but not in other areas.
The results demonstrated that the temperature in the study area exhibited an increasing trend, and is the main factor of altitudinal vegetation belts change in the Tianshan Mountains.