同时多年冻土抑制水分向深层土壤的下渗，增加了径流深度和蒸腾发强度。
Ever frozen ground prevents water from infiltrating to deep layer, which increases the depth of runoff and intensity of transpiration.
研究表明：河谷下切引起的岩体卸荷松弛，雨水进渗导致的岩体强度衰减是导致红层滑坡形成的主要因素。
Study shows that: incised valley of the rock mass caused by unloading relaxation, caused by rainwater infiltration rock strength degradation is the formation of red layer a major factor in landslides.
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