Scale Independence and Spatial Uniformity of Specific Sediment Yield in Loess Areas of the Wuding River Basin, Northwest China

doi:10.1002/ldr.2666

	Scale Independence and Spatial Uniformity of Specific Sediment Yield in Loess Areas of the Wuding River Basin, Northwest China
	Zheng, Mingguo
刊名	LAND DEGRADATION & DEVELOPMENT
	2017-05-01
卷号	28 期号:4 页码:1450-1462
关键词	sediment yield erosion spatial pattern model topography
ISSN号	1085-3278
DOI	10.1002/ldr.2666
通讯作者	Zheng, Mingguo(zhengmg.04b@igsnrr.ac.cn)
英文摘要	Most of the sediment loads of the Chinese Yellow River originate from the 113,000km(2) Hekou-Longmen Section. This study investigated the spatial pattern of specific sediment yield in the Wuding River basin, a tributary of the section. Data collected in 36 instrumented watersheds were used. Stratifying the watersheds in terms of surface regolith reveals a scale uncorrelated and a roughly constant SSY (mean annual specific sediment yield) of 18,720Mgkm(-2)yr(-1) in the loess areas of the basin, with basin areas varying between 0.107 and 9,355km(2). A zero-variable model (i.e. SSY=18,720) thus performs well with a mean error of approximately 15%. The spatial uniformity even holds at the annual time scale; a spatially invariable SSYa (specific sediment yield for a single year) remains applicable with a mean error of the order of 40%. The spatial uniformity in SSY and SSYa allows a direct scale extrapolation. Moreover, the established zero-variable models and the scale extrapolation are even applicable to the Hekou-Longmen Section. The spatially uniform SSY accords with the spatial invariability of many sediment-yield related factors, such as basin slope and rainfall in the loess areas of the Wuding basin. Given the fact that sediment delivery ratio is close to 1 in the Loess Plateau, a spatially uniform SSY is equivalent to a uniform erosion rate among watersheds. This finding, contrasting with current consensus that erosion and sediment yield vary greatly in space, is greatly helpful in predicting erosion and sediment yield in the Loess Plateau. Copyright (c) 2016 John Wiley & Sons, Ltd.
资助项目	National Natural Science Foundation of China[41271306] ; National Natural Science Foundation of China[41230746] ; National Mountain Flood Disaster Investigation Project[SHZH-IWHR-57] ; Jiangxi Key Laboratory of Soil Erosion and Conservation[JXSB201301]
WOS关键词	SOIL-EROSION ; RUNOFF GENERATION ; HILLY AREAS ; PLATEAU ; CATCHMENT ; TRANSPORT ; RATES ; PATTERNS ; DELIVERY ; SPAIN
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
语种	英语
出版者	WILEY
WOS记录号	WOS:000401322900026
资助机构	National Natural Science Foundation of China ; National Mountain Flood Disaster Investigation Project ; Jiangxi Key Laboratory of Soil Erosion and Conservation
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/64470]
专题	中国科学院地理科学与资源研究所
通讯作者	Zheng, Mingguo
作者单位	Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, 11A Datun Rd, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Zheng, Mingguo. Scale Independence and Spatial Uniformity of Specific Sediment Yield in Loess Areas of the Wuding River Basin, Northwest China[J]. LAND DEGRADATION & DEVELOPMENT,2017,28(4):1450-1462.
APA	Zheng, Mingguo.(2017).Scale Independence and Spatial Uniformity of Specific Sediment Yield in Loess Areas of the Wuding River Basin, Northwest China.LAND DEGRADATION & DEVELOPMENT,28(4),1450-1462.
MLA	Zheng, Mingguo."Scale Independence and Spatial Uniformity of Specific Sediment Yield in Loess Areas of the Wuding River Basin, Northwest China".LAND DEGRADATION & DEVELOPMENT 28.4(2017):1450-1462.