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冰川冻土  2015 

祁连山大通河源区冻土特征及变化趋势

DOI: 10.7522/j.issn.1000-0240.2015.0003, PP. 27-37

Keywords: 大通河源区,冻土分布,年平均地温,活动层,退化

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Abstract:

大通河源区位于祁连山中东部,属高山多年冻土区,利用源区内冻土钻探及监测资料对源区冻土发育的基本特征及变化趋势进行了分析和探讨.冻土地温分析表明,源区冻土年平均地温随海拔的变化梯度约为3.82℃·km-1,且冻土地温与表层覆被条件关系密切.盆地平原地带多年冻土厚度约为17~86m,且以海拔每上升100m冻土厚度增加约10m的梯度增加.多年冻土活动层厚度受海拔地带性作用不显著,更多地受局地因素的控制,地表覆被条件成为其主要影响因素.在气温升高以及人类活动日益增多的影响下,源区冻土整体处于退化状态,多年冻土年平均地温以0.0075℃·a-1的速率上升.

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