Comparative study on climate gradient changes in the north slope of Qilian Mountains

Under the background of global warming,using meteorological station observation data along altitudinal gradient in the north slope of Qilian Mountains,and taking the difference contrast method,climatic belt spatial gradient change in mountains was researched.The results showed that when altitude increased 100 m in the north slope of Qilian Mountains,the average annual temperature decreased about 0.52 ℃,annual accumulated temperature of 0 ℃ and ≥10 ℃decreased 147.8 ℃ and 160.6 ℃,respectively;the average annual rainfall increased about 17.41 mm from 1 700 m to 3 300 m in altitude,the average annual rainfall decreased about 30.21 mm from 3 300 m to 3 800 m in altitude;average annual soil temperature reduced about 0.8 ℃,soil moisture content increased about 5.13% in growing season;average frost-free period reduced 0.065 9 times.Comparing with the past,temperature,soil temperature,accumulated temperature in north slope of Qilian Mountains showed volatility slightly elevated,precipitation and soil moisture was volatility slightly dropped in the recent 10 years.