A Simple Enrichment Correction Factor for Improving Erosion Estimation by Rare Earth Oxide Tracers

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	A Simple Enrichment Correction Factor for Improving Erosion Estimation by Rare Earth Oxide Tracers
	Zhang, X. C. (John)1; Liu, G.1; Zheng, F. L.1; Liu, G (reprint author), Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Peoples R China.
刊名	VADOSE ZONE JOURNAL
	2017
卷号	16 期号:12
ISSN号	1539-1663
文献子类	Article
英文摘要	Spatially distributed soil erosion data are needed to better understand soil erosion processes and validate distributed erosion models. Rare-earth element (REE) oxides have been extensively tested and used to trace soil movement at plot or small watershed scales to generate spatial erosion data. However, a general concern regarding the accuracy of the technique arose due to selective binding of REE to fine soil particles and their preferential transport during soil erosion by water. Our objective was to develop a simple enrichment correction factor to improve the accuracy of the technique without the need for measuring REE for multiple size classes. A coarse Lithic Ustipsamment soil (2% clay, 20% silt), deliberately tagged with eight REE oxides, was packed into eight zones in a physical model of a small watershed to trace erosion from each zone. Three 30-min rains were simulated at 1, 1.5, and 2 mm min(-1), and runoff was collected every 2 min. Sediment was separated into nine size classes, and REE oxides in each class were extracted and analyzed by inductively coupled plasma-mass spectrometry. Both REE and the silt + clay fraction (<0.05 mm) were enriched in the sediment, resulting in a consistent overestimation of soil loss. An enrichment correction factor, based on enrichment of the <0.05-mm fraction, effectively corrected the overestimation and reduced the event mean estimation errors from 18 to 40% to <4.5%. The correction circumvents the need for measuring REE for multiple size classes, which is costly and time consuming. Moreover, this study found that REE tracers were conservative within each size class during erosion, and this scientifically underpins the use of an enrichment correction factor and erosion tracing by multiple size classes. The correction factor should be further tested with different soils.
学科主题	Environmental Sciences & Ecology ; Agriculture ; Water Resources
出版地	MADISON
语种	英语
出版者	SOIL SCI SOC AMER
WOS记录号	WOS:000418354300005
资助机构	National Natural Science Foundation of China [41571263, 4171101192]; Innovative Talents Promotion Plan in Shaanxi Province [2017KJXX-83]; Natural Science Basic Research Plan in Shaanxi Province of China [2016JQ4017]; Ministry of Science and Technology of China [2015BAC01B03-03]; 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] ; National Natural Science Foundation of China [41571263, 4171101192]; Innovative Talents Promotion Plan in Shaanxi Province [2017KJXX-83]; Natural Science Basic Research Plan in Shaanxi Province of China [2016JQ4017]; Ministry of Science and Technology of China [2015BAC01B03-03]; 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] ; National Natural Science Foundation of China [41571263, 4171101192]; Innovative Talents Promotion Plan in Shaanxi Province [2017KJXX-83]; Natural Science Basic Research Plan in Shaanxi Province of China [2016JQ4017]; Ministry of Science and Technology of China [2015BAC01B03-03]; 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] ; National Natural Science Foundation of China [41571263, 4171101192]; Innovative Talents Promotion Plan in Shaanxi Province [2017KJXX-83]; Natural Science Basic Research Plan in Shaanxi Province of China [2016JQ4017]; Ministry of Science and Technology of China [2015BAC01B03-03]; 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]
内容类型	期刊论文
源URL	[http://ir.iswc.ac.cn/handle/361005/7876]
专题	水保所科研产出--SCI_2017--SCI
通讯作者	Liu, G (reprint author), Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Peoples R China.
作者单位	1.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Peoples R China 2.ARS, USDA, Grazinglands Res Lab, 7207 W Cheyenne St, El Reno, OK 73036 USA
推荐引用方式 GB/T 7714	Zhang, X. C. ,Liu, G.,Zheng, F. L.,et al. A Simple Enrichment Correction Factor for Improving Erosion Estimation by Rare Earth Oxide Tracers[J]. VADOSE ZONE JOURNAL,2017,16(12).
APA	Zhang, X. C. ,Liu, G.,Zheng, F. L.,&Liu, G .(2017).A Simple Enrichment Correction Factor for Improving Erosion Estimation by Rare Earth Oxide Tracers.VADOSE ZONE JOURNAL,16(12).
MLA	Zhang, X. C. ,et al."A Simple Enrichment Correction Factor for Improving Erosion Estimation by Rare Earth Oxide Tracers".VADOSE ZONE JOURNAL 16.12(2017).