降雨侵蚀力是建立土壤侵蚀预报模型的基础。
Rainfall erosivity is necessary to develop the soil erosion model.
土壤侵蚀预报模型在空间尺度上可以划分为坡面、小流域和区域三个层次。
Soil erosion forecasting model can be divided into three levels of slope, small watershed and region in spatial scale.
介绍了美国土壤侵蚀预报模型的研究情况。特别叙述了USLE及WEPP的基本情况：理论基础、模型的适用性与局限性。
Model studies on soil erosion prediction undergone in USA, such as USLE and WEPP, are introduced as concerned with their physical fundamentals, applicability, and limitations.
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