A layer loss in soil profile is a sign of soil nutrient loss.
土壤剖面中a层的流失是土壤养分流失的标志。
There are 4 layers in typical profile of slope disintegration: the red soil layer, the sandy soil layer, the detritus layer and the crack weathered layer(also claimed the globular weathered layer);
把典型的崩岗剖面从上到下划分为：红土层、砂土层、碎屑层和裂隙风化层（亦称球状风化层）4个层次；
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