黄土高原沟壑区干旱阳坡的地域分异特征  

Regional Differentiation of Drought South Slopes in the Gullies of the Loess Plateau

作　　者：赵荟[1] 朱清科[1] 秦伟[1,2] 张英[3,4] 安彦川[1] 薛智德[1,5] 刘中奇[1] 

机构地区：[1]北京林业大学水土保持与荒漠化防治教育部重点实验室,北京100083 [2]中国水利水电科学研究院泥沙研究所,北京100048 [3]中国科学院地理科学与资源研究所,北京100101 [4]中国科学院研究生院,北京100049 [5]西北农林科技大学资源环境学院,杨凌712100

出　　处：《地理科学进展》2010年第3期327-334,共8页Progress in Geography

基　　金："十一五"国家科技支撑项目(2006BAD03A03);中国水科院青年基金(泥集1008)

摘　　要：针对黄土高原沟壑区干旱阳坡这种典型的困难立地进行因地制宜的植被恢复建设。本文选取甘肃西峰、山西吉县、陕西安塞、宁夏固原为研究区,采用25 m分辨率的DEM为数据源,基于GIS提取相关地形信息研究其干旱阳坡的地域分异特征。结果表明:①不同类型沟壑区干旱阳坡面积比例占45%～54%,表现为高塬沟壑区>过渡地带>丘陵沟壑区。②不同类型沟壑区干旱阳坡面积比例随坡度的变化规律不同,高塬沟壑区呈左偏态分布,其他样区均基本呈近似正态分布,且丘五区和过渡地带呈双峰现象。③不同类型沟壑区梁峁坡面积比例关系为:高塬沟壑区>过渡地带>丘陵沟壑区;沟坡面积比例为:丘陵沟壑区>过渡地带>高塬沟壑区;川台地面积比例为:丘五区>过渡地带>丘二区>高塬沟壑。④不同类型沟壑区各立地类型组所占的面积比例各不相同,除高塬沟壑区外基本呈阳向缓坡组>阳向陡险坡组>坡顶或沟底。研究成果可为黄土高原地区开展抗旱造林与植被重建提供理论依据。This paper systematically studied the drought south slopes of typical difficult site in the gullies of the Loess Plateau in order to resume and reconstruct vegetation based on the principle of local conditions. This paper took Xifeng in Gansu, Jixian in Shanxi, Ansai in Shaanxi, Guyuan in Ningxia as study areas, and used DEM with a resolution of 25 meters to research the regional differentiation characteristics of drought south slope in different type gully regions based on GIS. Results indicated that： （1） The area proportions of drought south slopes in different type gully regions are 45%-54%, and the ranking order is： the plateau gully region of Loess Plateau 〉 the transitional region〉 the hill and gully region of Loess Plateau. （2） The distributions of drought south slopes in different types gully regions of the Loess Plateau are different. The plateau gully region of Loess Plateau has a positively skewed distribution and the other areas have an approximately normal distribution. The 5th sub-region of hilly and gully regions and the transitional region have a double-peak distribution. （3） The order of loess slope area proportion in the different type gully regions is the plateau gully region of Loess Plateau 〉 the transition zone 〉 the hill and gully region of Loess Plateau, that of gully slope area proportion is the hill and gully region of Loess Plateau 〉 the transition zone 〉 the plateau gully region of Loess Plateau,and that of valley flatland area proportion is the 5th sub-region of hilly and gully regions 〉 the transition zone 〉 the 2nd sub-region of hilly and gully regions〉 the plateau gully region of the Loess Plateau. （4） The area proportion of site types groups in different type gully regions except the plateau gully region of the Loess Plateau showd the following order： sunny side gentle slope group 〉 sunny side steep risk slope group 〉 slope top and bottom. The results can provide the scientific theory basis for drought-resistant afforestation and vegetat

关 键 词：干旱阳坡 地域分异 丘陵沟壑区 高塬沟壑区 过渡地带 黄土高原 

分 类 号：S157[农业科学—土壤学]