The research results show that grass vegetation, like forest and bush, can effectively control soil erosion.

结果表明，草被与森林植被一样，能有效防止土壤侵蚀。

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These perennial forage can effectively control soil erosion and debility of soil nutrients.

这些多年生牧草能有效地控制土壤侵蚀和养分亏损。

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Therefore, the thorough research about the influences of crop cover on erosion is important to control erosion economically and effectively, as well as to improve soil erosion theory.

因此，深入研究作物植被对土壤侵蚀的作用，对经济有效地防治侵蚀、完善土壤侵蚀理论有重要的意义。

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