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答美国土壤保持局系统研究了影响土壤流失的各因子之间的定量关系，提出了一个通用土壤流失方程式，提出了一个通用土壤流失方程式可以估算和预报土壤流失量。方程式为：A＝R·K·L·S·C·P式中A——土壤流失量；R——降雨侵蚀能量指标；K——土壤可蚀性因子；L——坡长因子；
The United States Soil Conservation Bureau systematically studied the quantitative relationship between the various factors affecting soil erosion, put forward a general equation of soil loss, proposed a universal soil loss equation can estimate and forecast the amount of soil loss. The equation is: A = R · K · L · S · C · P where A - soil loss; R - rainfall erosion energy index; K - soil erodibility factor; L - slope length factor;