topsoil nutrient loss 表土养分流失
Irregular rainfall and loss of topsoil means that the land produces less than before.
无常的降水和表层土壤的流失都使土地逐渐减产。
In many countries the loss of productive topsoil has contributed to growing food deficits.
在许多国家里，生产性表土的流失已导致日益严重的粮食短缺。
Floods can remove fertile topsoil and begin a process resulting in the loss of planting areas.
洪涝可以冲走肥沃的表层土，渐渐的导致可耕种土地的丧失。
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