基于GIS的陇南市土壤侵蚀敏感性评价及其空间分异特征

土壤侵蚀是地理环境多因子综合作用的结果。以水土流失通用方程为理论基础,利用国内外已有的土壤侵蚀研究成果,运用数学模型和GIS分析相结合的方法,分析降水、地形、土壤和植被因子对陇南市土壤侵蚀敏感性的影响,并按照敏感性等级标准进行土壤侵蚀敏感性评价。明确了土壤侵蚀敏感性分布规律及其地域差异。结果表明:陇南市土壤侵蚀整体敏感性较高,极敏感区和高度敏感区面积达13107.51 km2,占总面积的46.94%,主要分布在武都区、文县和礼县的中西部。轻度敏感和不敏感区面积较小,分别占总面积的17.85%和3.14%。在综合评价陇南市土壤侵蚀敏感性空间分异的基础上,针对不同敏感等级的土地利用规划提出对策。

GIS-based Assessment and Spatial Variation on Soil Erosion Sensitivity of Longnan

Soil erosion is a major threat to global economic and environmental sustainability.Based on the theory of Universal Soil Loss Equation and the related research results on soil erosion at home and abroad,the paper analysed the influences of precipitation,soil texture,slope and land cover on the sensitivity of soil erosion.As a result,an assessment map of each factor was made.We also drew an integrated assessment map of sensitivity of soil erosion by overlapping function with ArcGis.Furthermore,we analysed di...