Research of Cover and Management Factor in the Model of the Revised Universal Soil Loss Equation of Black Earth Erosion in Northeastern Part of China

Solid vegetation roots may lead to the strong grip on the soil, thus they have a lot of positive effects, such as reducing both the rainfall kinetic energy and the amount of soil erosion, strengthening soil conservation and soil-reinforcement. Therefore, vegetation is a decisive factor in preventing soil erosion. Cover-management-C-factor is an important influential factor in The Universal Soil Loss Equation (USLE), determined mainly by such factors as vegetation coverage, situation of land utilization, productivity level, crop cultivation order, crop growing sequence, etc. So the value of Cover-management-C-factor is often difficult to estimate. Based on GIS technology, vegetation cover parameters drawn by SPOT statistics as well as field study, this research reveals the different land use types in the northeastern area of China so that the C-value of that area can be calculated through both formula and experimental assignment. Furthermore, by comparison of the two results, the C-value will be proved more precise and practical and thus its impact on soil erosion will provide more scientific basis for us.