An improved method for tracing soil erosion using rare earth elements

doi:10.1007/s11368-016-1356-y

ISWC OpenIR > 水保所科研产出--SCI > 2016--SCI

	An improved method for tracing soil erosion using rare earth elements
	Gang Liu 1,2; Hai Xiao 1; Puling Liu 1; Qiong Zhang 1; Jiaqiong Zhang 1
文章类型	Article
	2016
发表期刊	JOURNAL OF SOILS AND SEDIMENTS
通讯作者邮箱	gliu@foxmail.com
期号	16 页码:1670-1679
摘要	xt-stroke-width: 0px; "> Purpose The use of rare earth elements (REEs) as tracers provides a high-precision method for quantitative determinations of soil particle movement in soil erosion studies. In this study, a new calculation method was developed and tested to improve the precision of the REE tracing method and to expand the application of this method to areas with coarse-textured soils. Materials and methods This study used purple soil to simulate a catchment with data based on a field survey of a small catchment located in the Three Gorges Area in China. Eight different powdered rare earth oxides, which included La2O3, CeO2, Nd2O3, Sm2O3, Eu2O3, Tb4O7, Ho2O3 and Yb2O3, were applied as tracers to describe soil movement in this scaled catchment during three simulated rainfall events of 1.0, 1.5 and 2.0 mm min−1 rainfall intensity. Leaching experiments were conducted to investigate the vertical migration of REEs in soil layers. Particle size distributions (PSDs) and REE concentrations for each soil particle size class (1–2, 0.5–1, 0.25–0.5, 0.1–0.25, 0.075–0.1, 0.05–0.075, 0.02– 0.05, 0.005–0.02 and <0.005 mm) were analysed to evaluate the precision of the proposed calculation method. Results and discussion Most REEs remained in the first layer during leaching. The scanning electron microscopy-energy dispersive X-ray (SEM-EDX) mapping images showed that more REEs were adsorbed by small particles (≤0.1 mm), with large specific surface areas, than by large particles (>0.1 mm). During the three rainfall events, the coarsest size classes (1–2 and 0.5–1 mm) of the sediment samples were less than that of the soil. In contrast, the other classes, including <0.075 mm, showed the strongest adsorption for REEs, and the weight percentage of grains in eroded sediment was more than that in the source soil. The accuracy of the new proposed calculation method increased by 24.37, 20.25 and 3.84 % for the first, second and third storm, respectively, compared with the uncorrected mass of soil loss from the scaled catchment. Conclusions The REEs bonded well with purple soil particles and the leaching of REEs from the tagged layer to the lower layers was minimal. The <0.075-mm particle size class had the strongest adsorption capacity for REEs. The soil loss estimates were improved with the new calculation method
关键词	Coarse-texturedsoils Erosionprocesses Particle Size Distribution Quantitative Information Sediment Sources Tracers
DOI	10.1007/s11368-016-1356-y
收录类别	SCI
语种	英语
WOS记录号	WOS:000376265500022
引用统计
文献类型	期刊论文
条目标识符	sbir.nwafu.edu.cn/handle/361005/7795
专题	水保所科研产出--SCI_2016--SCI
通讯作者	Gang Liu
作者单位	1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, China 2.USDA-ARS National Sedimentation Laboratory, Oxford, MS 38655, USA
推荐引用方式 GB/T 7714	Gang Liu,Hai Xiao,Puling Liu,et al. An improved method for tracing soil erosion using rare earth elements[J]. JOURNAL OF SOILS AND SEDIMENTS,2016(16):1670-1679.
APA	Gang Liu,Hai Xiao,Puling Liu,Qiong Zhang,&Jiaqiong Zhang.(2016).An improved method for tracing soil erosion using rare earth elements.JOURNAL OF SOILS AND SEDIMENTS(16),1670-1679.
MLA	Gang Liu,et al."An improved method for tracing soil erosion using rare earth elements".JOURNAL OF SOILS AND SEDIMENTS .16(2016):1670-1679.

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