近50年来黑龙江省冻土厚度的时空变化特征
王宁, 臧淑英, 张丽娟

Spatial and temporal variations of spermafrost thickness in Heilongjiang province in recent years
Ning WANG, Shuying ZANG, Lijuan ZHANG
图3 冻土厚度年变化图及其回归分析
Fig. 3 Annual variation of permafrost thickness and its regression analysis