黄土丘陵沟壑区流域景观格局调控与减水减沙效益  

Relationship between adjustment of watershed landscape pattern and benefits of runoff and sediment reduction on loess hilly-gully region

作　　者：陈东立[1] 余新晓[1] 

机构地区：[1]北京林业大学水土保持学院

出　　处：《中国水土保持科学》2005年第4期77-80,共4页Science of Soil and Water Conservation

基　　金：国家重点基础研究发展规划项目"森林植被对土壤侵蚀过程的调控机理"(2002CB111502)

摘　　要：以小流域为单元进行景观格局的调控,是探索流域水土保持措施分布格局及评价治理效益的一条重要途径。以甘肃黄土丘陵沟壑区吕二沟流域为研究实例,应用地理信息系统建立流域数字高程模型,与土地利用格局图叠置运算,进行综合分析。结合利用“水保法”,计算出土地利用景观格局调整后,水土保持措施的减水、减沙效益,比未调整前分别提高了20．36％和21．55％。Watershed landscape pattern is regulated by small watershed unit, which is an important approach and method to research the distribution pattern of measures of soil and water conservation and to evaluate benefit of soil erosion control. A case study of Lv＇ergou watershed is located the loess hilly-gully region of Gansu province. Digital Elevation Model （DEM） was made using GIS and slope and aspect was superimposed. To test the benefits of runoff and sediment reduction after regulating on watershed landscape pattern, the benefits norm of soil and water conservation measures is used. When the land use shift to preferable pattern, the benefits of runoff and sediment reduction by measures of soil and water conservation taken in the research watershed have increased by 20.36% and 21.55% respectively.

关 键 词：流域景观格局 数字高程模型 减水效益 减沙效益 黄土丘陵沟壑区 

分 类 号：S157.1[农业科学—土壤学] S157.2[农业科学—农业基础科学]