中国东北兴安岭地区年冻融频次的分布规律
|
Distribution law of annual freeze-thaw frequency in Xing’anling region of Northeast China
|
图4. 1990—2017年兴安岭地区年冻融频次的年际变化 |
Fig. 4. Interannual variation of annual freeze-thaw frequency in Xing’anling region from 1990 to 2017 |
![]() |