摘要
水土流失是喀斯特流域主要的生态问题,通过收集贵阳市麦西河流域气象、土地利用、土壤等数据,利用3S的技术方法建立流域土壤侵蚀空间数据库,应用USLE模型构建流域土壤侵蚀评价模型,运用GIS的空间数据处理方法,实现对麦西河流域土壤侵蚀模数的估算。结果表明:麦西河流域年均土壤侵蚀速率为1 230.81t/(hm2.a),侵蚀强度类型以微度和轻度为主;中度以上侵蚀类型主要发生在坡度大于25°,植被覆盖较差的山体位置,尤其是旱地类型;从子流域上看麦乃7号子流域土壤流失较为严重。
Soil erosion is one of the main ecological problems in karst basin.The data on meteorology,soil and land use of Maixi River Basin in Guiyang were collected.3S technology was used to establish the spatial database of soil erosion.Evaluational model of soil erosion was constructed by applying USLE model.The modulus estimates of soil erosion was performed by using GIS spatial data processing method.The results showed that annual soil erosion rate of Maixi River Basin was 1 230.81 t/（hm2·a）,the type of erosion intensity was dominated by micro and mild degree,the type of moderate to severe erosion occurred mainly in the location of the slope gradient greater than 25° and poor vegetation coverage,especially dry type.From the point of sub-basin of view,soil erosion of the seventh sub-basin of Mainai River was more serious.
出处
《水土保持研究》
CSCD
北大核心
2011年第5期99-103,295,共5页
Research of Soil and Water Conservation
基金
<百花湖麦西河综合治理集成技术与工程示范>子课题麦西河流域面源污染调查项目(合同编号为:贵阳市社会发展攻关计划[2009]筑科农合同字第3-04号
2009-2012年)
贵州省社会发展科技攻关项目(黔科合SY[2010]3176号)
