坡地系统土壤侵蚀定量评价方法

区域性土壤侵蚀的定量评在涉及到泥沙输移的非连续性难题和众多的非确定性因素，目前应用较普遍的小区定量难以适用。所提出的定量评价方法是利用ＧＩＳ技术、模糊数学、将以分布参数为特征的区域坡地系统划分成若干类具有集中参数特征的基本侵蚀单元，结合ＵＳＬＥ方程来模拟空间上不同侵蚀背景条件下土壤侵蚀的强度，并可以确定影响土壤侵蚀的主要因子及其排序，该方法适用性强，可用于不同空间尺度的土壤侵蚀定量评价。

A METHODOLOGY OF SOIL EROSION EVALUATION ON SLOPE SYSTEM

Since the processes of erosion, transportation and accumulation in slope system are so extremely complex that the available models or equations based on experimental (standard) plots could not be suitable for the purpose. This article presents one evaluating method for regional slope system and some conclusions obtained from the research in southern China. In this research the aim was not to painstakingly seek the accurate amount of soil loss, but to quantify the erosion conditions of slope system by using the concept of basic erosion unit and geographical information system (GIS) with fuzzy. The differences of intensity of soil erosion in various conditions are modeled by universal soil loss equation (USLE). By statistics analyzing the relations between the influencing factors and the difference of identity of soil erosion, the main influencing factors and their orders under different erosion conditions are determined. This has confirmed that human activity is a main reason for local soil erosion. The present method could be used on any scale of slope system for soil erosion evaluation.