基于GIS的粤北青莲水流域水土流失成因分析

随着人类社会经济活动的加强，水土流失有持续恶化趋势，青莲水流域内土壤肥力下降，河道泥沙淤积，影响河流行洪安全。本文选用通用土壤流失方程，利用ArcGIS的空间叠加分析等功能，分别计算分析研究区内与土壤侵蚀相关的降雨、土壤、植被、地形、土地利用等因子，经叠加分析后生成流域水土流失现状图。结果表明，地形地貌因子和土地利用因子是影响流域水土流失的关键因子，研究结果可为广东省中小流域治理提供水土保持方面的理论支撑。

Causes Analysis of Soil Erosion in Qinglian River Watershed of North Area of Guangdong Province Based on GIS

With the strengthening of human social and economic activities, water and soil erosion has continued to deteriorate in Qinglian River Watershed, which not only reduce soil fertility, also caused the river silt, and affect the safety of river flood.By u-sing GIS technology and selecting the Universal Soil Loss Equation ( USLE) as The mathematical models, using the spatial analysis function of the GIS, calculation and overlay analysis the factor of rainfall, soil, vegetation, topography, land use and so on, gener-ate status maps of soil erosion.And soil erosion of the region are analyzed and evaluated.Research results show that, topographic factors and land use factors are the key factor of soil erosion, and the result could support technical supporting for the middle and small watershed soil erosion of Guangdong province.