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。
The loss of trees upsets the ecosystem as trees are necessary to build topsoil, maintain rainfall in dry climates, purify underground water and to convert carbon dioxide to oxygen.
树木的减少扰乱了生态系统，因为固定表层土壤，保持旱季降雨，净化地下水和将二氧化碳转化为氧气都需要树木。
Compared with dripping and seeping irrigation, evaporation loss of water from topsoil is the most in furrow irrigation.
沟灌耕层土壤蒸发损失的水分大于滴灌大于渗灌。
So far, farmers have been able to compensate for the loss of fertile topsoil by applying more chemical fertilizers to their fields;
迄今为止，农民只能靠向田地里施用更多的化肥来弥补肥沃表层土被侵蚀所造成的损失。
So far, farmers have been able to compensate for the loss of fertile topsoil by applying more chemical fertilizers to their fields;
迄今为止，农民只能靠向田地里施用更多的化肥来弥补肥沃表层土被侵蚀所造成的损失。
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