祁连山寺大隆林区积雪变化趋势与气温和降水

Changes of Snow Cover and its Relations to Temperature and Precipitation in Sidalong Forests of Qilian Mountains

根据位于祁连山 (中山带 )寺大隆林区祁连山水源涵养林研究院森林生态系统定位研究站近 2 2年来的年最大雪深、月平均气温、月降水量观测记录 ,用平均差值法、最小二乘法、自回归滑动平均法检验了祁连山寺大隆林区积雪、冷季降水、冷季平均气温的变化趋势 ,结果表明 :祁连山寺大隆林区积雪呈增加趋势 ,近 2 2年来年平均增加 1 .1 4% ,冷季气温和降水的变化趋势也是增加的 ,其中冷季降水平均增加 0 .39% ,而冷季气温升高了 0 .88℃ ,积雪与冷季气温之间存在着弱的负相关关系 。

On the basis of observed records of yearly snow cover depth, monthly average temperature and monthly total precipitation in Sidalong forests of Qilian Mountains, the variation trends in the snow cover depth, cold season precipitation and cold season temperature are studied. The results show that the annual amount of snow cover increases by 1.14% in the past 22 years, the secular trend of cold season temperature and precipitation is increasing as well, the annual increasing rate of cold season precipitation is 0.39%,the cold season temperature has increased by 0.88 ℃. A significant positive correlation exists between snow cover and cold season precipitation, but the correlation between snow cover and cold season temperature is negative weakly.