淅川县石质荒漠化土地空间分布特征研究

Spatial Distribution Characteristic of Rocky Desertification in Xichuan County

淅川县是南水北调中线工程的核心水源区,也是主要淹没区及渠首所在地,全县石质荒漠化土地面积745.539 3 km^2,占土地总面积的26.44%,水土流失和区域生态资源环境问题十分严重。为有效防治石质荒漠化,以淅川县为研究区,基于高分辨率遥感影像、DEM、地形图、土地利用现状成果等基础信息数据,利用"3S"技术对淅川县石质荒漠化土地的海拔和坡向分布特征进行了分析。结果表明:石质荒漠化土地主要分布在海拔200～500 m高程带和S、SE、SW坡向上,S坡向上分布面积最大,N坡向上分布面积最小。因此,在淅川县石质荒漠化防治措施选择、配置、实施等工程实践中应充分考虑海拔和坡向的影响。

Xichuan County is the core source area,main flooded area and location of the head work of the Middle Route of South-to-North Water Transfer Project,which the rocky desertification area of the whole county is 745. 539 3 km^2,making up 26.44% of the total land area,causing serious soil and water loss and regional ecological resources and environmental problems. In order to effectively prevent and control the rocky desertification,the paper analyzed the characteristics of the elevation and slope direction distribution of rocky desertification land by taking Xichuan County as a studied area,based on basic information data of the high resolution remote sensing images,DEM,topographic maps and results of land use status and by using 3 S technology. The outcomes show that the rocky desertification land is mainly distributed on the elevation zone of 200-500 m and mainly distributed on the slope directions of south,southeast and southwest. The distribution area of the south slope direction is the largest and the north slope direction is the smallest. Thus,the influence of elevation and slope direction should be fully considered in the practice of measures selection,allocation and implementation of stone desertification prevention and control of the county.