季节性冻融土壤水分运动规律

Water movement regularities of seasonal freezing-thawing soil

从定性和定量两个层面分析了潜水浅埋深条件下季节性冻融土壤水分运动的一般规律,结果表明:1)冻结期内土壤水分向上运动,潜水补给土壤水;消融期则以20～40cm深度为界,土壤水分向上下两端运动,土壤水补给潜水,整个过程导致潜水位先降后升,但一部分损失于潜水蒸发.2)在冻融过程中各个阶段,20～40cm以上土层和以下土层水分运动规律有显著差异,而且其上下土层水分相互交换较少.3)冻融过程中土壤含水率变幅随深度的增加而减小,但下层土壤具有更大的水分通量.4)冻结期内潜水埋深过大会导致潜水对土壤水的补给显著偏小,致使冻融层储水量降低,而消融期则没有显著的规律.

Water movement regularities of seasonal freezing-thawing soil in shallow groundwater were analyzed by both quality and quantity approaches.The results show that： 1） in freezing period,soil water moved upwards,groundwater also supplied to soil water;in thawing period,soil water moved two sides from depth of 20-40 cm,and supplied to groundwater downwards,the whole process led the depth of groundwater down and up,but some lost in groundwater evaporation.2） In every period,soil water above and below 20-40 cm showed different regularities,and water exchange between them was little.3） Amplitude of soil water decreased when depth increased,while deeper layers had larger water flux.4） Too deep of groundwater during freezing process would make supply from groundwater decrease significantly,which would led to decreasing of water storage in freezing layers;but there was no such regularity in thawing process.