“permafrost region of northeast China”的概念、定义、翻译、参考文献-科学参考

单词	permafrost region of northeast China
释义	permafrost region of northeast China Encyclopedia 理学中国的冻土释 permafrost region of northeast China东北多年冻土区位于欧亚大陆多年冻土区的南缘地带，面积约39万平方千米，介于北纬46°30′～53°30′，海拔几百米至1000米上下。冻土年均温度（指地温年变化层底部的温度）大多在-1.5～0℃，最低-4.2℃；地温年变化深度12～16米。冻土厚度亦随纬度降低而减小，大多在50米以下，最厚达百米。
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