摘要
浅沟侵蚀是半干旱黄土区坡面土壤侵蚀的重要方式。基于陕北吴起县2004年SPOT影像,提取各小流域的浅沟分布,并结合吴起县境内35个小流域土地利用调查数据,分析沟缘线以上土地利用、坡度与浅沟分布的相关性。结果表明浅沟密度依次为:丘陵区旱地<林地<草地;各土地利用类型的浅沟密度存在显著差异。同时,在各类土地利用类型上浅沟密度与平均坡度呈显著正相关,浅沟主要分布在25°～35°的坡度段上。研究结果可为该区域生态修复和水土保持提供参考。
Ephemeral gully（EG） erosion is one of the important ways of soil erosion in semiarid loess area.Extraction of ephemeral gullies from small watersheds was based on the SPOT image of Wuqi County in 2004,and the correlations between land use,slope and distribution of ephemeral gullies above shoulder line of valleys were analyzed based on the investigated date of land use in 35 small watersheds in Wuqi County,north Shaanxi Province.The results reveal that the EG density was in an order of hilly dry land woodland grassland;the EG density is significantly different from different land use types.Correlation analysis reveals that there was a positive correlation between the average slope and EG density in the same land use types,and ephemeral gullies are mainly distributed in a slope range from 25° to 35°.The study results can be referred in regenerating the ecology and conserving water and soil.
出处
《干旱区研究》
CSCD
北大核心
2011年第4期586-591,共6页
Arid Zone Research
基金
十一五科技支撑课题"困难立地工程造林关键技术研究"(2006BAD03A0302)
交叉学科北京市重点学科建设项目资助
关键词
浅沟密度
坡度
土地利用
土壤侵蚀
黄土丘陵区
吴起县
陕北
density of ephemeral gully
slope
land use
soil erosion
Loess hilly-gully region
Wuqi County
north Shaanxi Province
