基于GIS和分形理论的榃滨河流域水土流失空间信息研究

Study on Spatial Information of Soil and Water Loss in the Tanbin River Basin Based on GIS and Fractal Theory

基于GIS技术提取了榃滨河流域水土流失强度和侵蚀模数信息,分析其维数特征及其与土地利用类型的关系。结果表明,该流域水土流失以轻微度为主(共占85.25%),强度水土流失分布较少;随着水土流失强度增大,其斑块的分形维数与Moran’s I分别呈现增加、减小趋势,说明其空间分布形态趋于离散、聚集性变差;不同用地类型对水土流失效应存在差异,林地、草地主要起保育功能,建设用地和耕地结构增加则会加剧水土流失。

Based on GIS technology, the soil erosion intensity and erosion modulus information of the Tanbin River Basin were extracted, and its dimensional characteristics and its relationship with land use types were analyzed. The results show that the water and soil loss in the basin is dominated by slightness(85.25%), and the distribution of soil erosion is less. With the increase of soil erosion intensity, the fractal dimension of the plaque increases and decreases with Moran’s I.The trend indicates that the spatial distribution pattern tends to be discrete and the aggregation is worse. Different land use types have different effects on soil erosion. Forest land and grassland mainly play a conservation function, and the increase of construction land and cultivated land structure will aggravate soil erosion.