黄土地区通用土壤流失方程模型研究

Research on universal soil loss equation model in loess regions

以晋西离石王家沟流域为试验区，介绍了黄土丘陵沟壑区通用土壤流失方程（ＵＳＬＥ）模型的构造原理和建立方法，并用灰色控制系统的理论和方法确定了模型中各参数值，建立了适合试验区水土流失的ＵＳＬＥ修正方程。同时用系统结构编码方法对试验区土壤可侵蚀性因子、土壤结构、土壤渗透性、作物覆盖、土壤侵蚀传递比率因子等进行了分析处理，提取了土壤侵蚀定量化因子值，从而确定了试验区流域土壤流失量的空间分布规律。

Taking Wangjiagou Watershed in Lishi County,west of Shanxi Province,as a test area,this paper presents the constructive principles and building approaches for Universal Soil Loss Equation (USLE) in hills and gullies of loess regions;defines parameter values in the model with theories and methods of Grey.Controlling System;and builds revised equation of USLE suitable for water and soil loss in the test area.Meanwhile,with structural coding approaches of system,the author analyses and processes various factors in the test area,such as soil erodibility factors,soil structures,soil permeability,cropping covers,delivery ratio factors of soil erosion,etc,and extracts quantitative factor values of soil erosion.Therefore,space distribution regularities of soil loss quantities in the trial region are defined.