Understanding erosion processes using rare earth element tracers in a preformed interrill-rill system

doi:10.1016/j.scitotenv.2017.12.345

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	Understanding erosion processes using rare earth element tracers in a preformed interrill-rill system
	Fenli Zheng 1; Xun-chang (John) Zhang 2; Gang Liu 1; Liu, G (reprint author), Northwest A&F Univ, Inst Soil & Water Conservat, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China.
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2018
卷号	625 页码:920-927
关键词	Sediment Tracer Rare Earth Element Spatial Erosion Distribution Interrill Erosion Rill Erosion
ISSN号	0048-9697
DOI	10.1016/j.scitotenv.2017.12.345
文献子类	Article
英文摘要	Tracking sediment source and movement is essential to fully understanding soil erosion processes. The objectives of this study were to identify dominant erosion process and to characterize the effects of upslope interrill erosion on downslope interrill and rill erosion in a preformed interrill-rill system. A coarse textured soil with 2% clay and 20% silt was packed into a physical model of a scaled small watershed, which was divided into eight topographic units and was tagged with eight rare earth element (REE) oxides. Three 30-min rains were made at the sequential intensities of 60, 90, and 120 ram h(-1), and runoff and sediment were collected every 2 min at the outlet. REE concentration in sediment was measured and used to estimate source contributions after fine-enrichment correction. Results showed that interrill erosion rate and sediment concentration increased with downslope distance, indicating that sediment transport might have controlled interrill erosion rates. In contrast, rill erosion rate was limited by rill detachment and development process. Rill erosion contributed most soil loss; however, the proportion decreased from 78 to 61% as rainfall intensity increased and rill network matured over three rains. Interrill erosion was more sensitive than rill erosion to rainfall intensity increases. The former was mostly affected by rainfall intensity in this experimental setup, while the latter was controlled by flow discharge, gradient, and rill evolution stage. The greatest sediment concentration and delivery rate occurred in the stage of the fastest rill development. The increased sediment delivery from interrill areas appeared to suppress rill detachment by concentrated flow. This study enhanced our understanding of interrill and rill erosion processes and provided the scientific insights for improving soil erosion models. (C) 2018 Elsevier B.V. All rights reserved.
学科主题	Environmental Sciences & Ecology
出版地	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000426356600094
资助机构	National Key Research and Development Program of China [2016YFE0202900] ; National Key Research and Development Program of China [2016YFE0202900] ; Natural Science Foundation of China [41761144060] ; Natural Science Foundation of China [41761144060] ; Chinese Academy of Sciences [161461KYSB20170013] ; Chinese Academy of Sciences [161461KYSB20170013] ; Ministry of Science and Technology of China [2015BAC01B03-03] ; Ministry of Science and Technology of China [2015BAC01B03-03] ; Innovative Talents Promotion Plan in Shaanxi Province [2017KJXX-83] ; Innovative Talents Promotion Plan in Shaanxi Province [2017KJXX-83] ; West Light Foundation of the Chinese Academy of Sciences [2014-91] ; West Light Foundation of the Chinese Academy of Sciences [2014-91] ; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau [A314021403-C2] ; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau [A314021403-C2] ; National Key Research and Development Program of China [2016YFE0202900] ; National Key Research and Development Program of China [2016YFE0202900] ; Natural Science Foundation of China [41761144060] ; Natural Science Foundation of China [41761144060] ; Chinese Academy of Sciences [161461KYSB20170013] ; Chinese Academy of Sciences [161461KYSB20170013] ; Ministry of Science and Technology of China [2015BAC01B03-03] ; Ministry of Science and Technology of China [2015BAC01B03-03] ; Innovative Talents Promotion Plan in Shaanxi Province [2017KJXX-83] ; Innovative Talents Promotion Plan in Shaanxi Province [2017KJXX-83] ; West Light Foundation of the Chinese Academy of Sciences [2014-91] ; West Light Foundation of the Chinese Academy of Sciences [2014-91] ; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau [A314021403-C2] ; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau [A314021403-C2]
内容类型	期刊论文
源URL	[http://ir.iswc.ac.cn/handle/361005/8249]
专题	水保所科研产出--SCI_2018--SCI
通讯作者	Liu, G (reprint author), Northwest A&F Univ, Inst Soil & Water Conservat, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China.
作者单位	1.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Inst Soil & Water Conservat, Yangling 712100, Peoples R China 2.ARS, USDA, Grazinglands Res Lab, El Reno, OK 73036 USA
推荐引用方式 GB/T 7714	Fenli Zheng,Xun-chang ,Gang Liu,et al. Understanding erosion processes using rare earth element tracers in a preformed interrill-rill system[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2018,625:920-927.
APA	Fenli Zheng,Xun-chang ,Gang Liu,&Liu, G .(2018).Understanding erosion processes using rare earth element tracers in a preformed interrill-rill system.SCIENCE OF THE TOTAL ENVIRONMENT,625,920-927.
MLA	Fenli Zheng,et al."Understanding erosion processes using rare earth element tracers in a preformed interrill-rill system".SCIENCE OF THE TOTAL ENVIRONMENT 625(2018):920-927.