An improved method for tracing soil erosion using rare earth elements
文献类型：期刊论文
| 作者 | Gang Liu1,2; Hai Xiao1; Puling Liu1; Qiong Zhang1; Jiaqiong Zhang1 |
| 刊名 | JOURNAL OF SOILS AND SEDIMENTS
 |
| 出版日期 | 2016 |
| 期号 | 16页码:1670-1679 |
| 通讯作者邮箱 | gliu@foxmail.com |
| 关键词 | Coarse-texturedsoils Erosionprocesses Particle size distribution Quantitative information Sediment sources Tracers |
| 通讯作者 | Gang Liu |
| 英文摘要 | 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 |
| 语种 | 英语 |
| WOS记录号 | WOS:000376265500022 |
| 源URL | [http://ir.iswc.ac.cn/handle/361005/7795]  |
| 专题 | 水土保持研究所_水保所科研产出--SCI_2016--SCI |
| 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. |
入库方式： OAI收割
来源：水土保持研究所
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