小兴安岭五营林区地温变化特征分析

小兴安岭五营林区各层年平均地温中，地表温度最高，20cm浅层地温最低。10月一次年3月地表及浅层土壤热量由下向上传导，在20cm深度左右出现逆温层；而4-9月热量传导则由上而下。年际变化和日变化中，地温峰值均随着深度的增加而变小，并且出现的月份存在滞后现象，日变化中峰值出现的时间与气温相比具有一定的前移性。

Characteristics analysis to the ground temperature Changing of Wuying region

The ground layer temperature was the highest among the every under ground layer temperature, and the temperature of underground 20cm layer was the lowest. The heat source transmitted from the lower layers to higher ones from Oct. to Mar., and the temperature inversion layer was formed on the underground 20cm layer. But from Apr. to Spt.,the direction of heat transmission was opposite.The highest underground temperature decreased with the rising of layers, no matter it was annual or diurnal changing.