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冰川冻土  2001 

小兴安岭黑大公路沿线多年冻土分布及退化状态

, PP. 312-306

Keywords: 小兴安岭,多年冻土,分布,退化

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Abstract:

黑大公路沿线多年冻土主要分布于黑河-北安段,属小兴安岭岛状多年冻土区.该区存在的多年冻土是晚全新世寒冷时期的产物,现处于欧亚多年冻土南界边缘.多年冻土发育在低洼、地表积水、塔头草生长茂密、草炭和泥炭发育的沼泽化湿地当中.沼泽湿地独特的热交换特性决定了其中发育的多年冻土处于退化的最晚阶段,冻土的退化在自然条件下可能依赖于由下至上的地下热流.多年冻土的地温剖面表现为零梯度曲线且冻土温度接近于0℃,由此决定了多年冻土对人为活动干扰的敏感性.

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