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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The serious soil erosion threatens ecological environment of Miyun reservoir watershed. How to control soil erosion and to improve ecological environment becomes significant.

然而严重的水土流失威胁着水库集水区生态环境，如何治理集水区内的水土流失，改善集水区生态环境非常重要。

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In the 1980s key water and soil erosion control projects were launched in areas suffering from serious water and soil erosion such as those along the Yellow and the Yangtze rivers.

20世纪80年代，国家开始在黄河、长江等水土流失严重地区实施水土流失重点防治工程。

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