摘要
以延安市为例,应用GIS技术依据水利部土壤侵蚀分类分级标准进行土壤侵蚀强度等级评价。分析了延安市2006年土壤侵蚀强度等级及各县市侵蚀差异性,定量研究坡度衰减对土壤侵蚀评价结果的影响并将土壤侵蚀强度评价结果与2002年土壤侵蚀强度进行比对分析。结果表明:2006年延安市各县市中吴起县土壤侵蚀最为强烈,黄龙县最弱;经过坡度变换,延安市约68%的地区侵蚀增强;与2002年相比,2006年延安市轻度侵蚀和剧烈侵蚀面积减小,其它各侵蚀强度等级面积增大。
According to MWR （Minister of Water Resources） standard of soil erosion grading and based on GIS,this article evaluated soil erosion intensity grade,taking Yan＇an as an example,and analyzed the differences of soil erosion intensity grades among different counties of Yan＇an in 2006. Gradient reduction and its influence on soil erosion evaluation results were studied quantitatively,and the result is compared with soil erosion intensity in 2002. Among all the counties,Wuqi county had the most intensive soil erosion,while Huanglong county is the least. Compared with soil erosion in 2002,there was a rise in soil erosion intensity in nearly 68% area of Yan＇an after gradient transform was taken into account. There was a decrease in area in weak and severe magnitude erosion whereas an increase in area in the other soil erosion grades in Yan＇an.
出处
《水土保持研究》
CSCD
北大核心
2010年第3期28-31,F0002,共5页
Research of Soil and Water Conservation
基金
国家重点基础研究发展计划"区域水土流失与趋势分析"(2007CB407203)
