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Spatial characteristics and controlling factors of chemicalweathering of loess in the dry season in the middle LoessPlateau, China
Xiao,J(Xiao,Jun)[1,2]; Zhang,F(Zhang,Fei)[1,2]; Jin,ZD(Jin,Zhangdong)[1,2]
2016
发表期刊HYDROLOGICAL PROCESSES
卷号30期号:2016页码:4855-4869
文章类型期刊论文
摘要

Hydrochemistry methods were used to decipher the weathering and geochemical processes controlling solute acquisition of river waters in the dry season in the middle Loess Plateau (MLP), one of the most severely eroded areas and turbid riverine systems in the world. River waters were neutral to slightly alkaline with pH varying from 7.6 to 9.6. The total dissolved solids decreased from northwest to southeast with a mean value of 804 mg/l, much higher than the global average and other large rivers in China. Ternary diagram showed that river waters were dominated by Na+, HCO3 , and Cl with the main water-type of HCO3 –Cl – Na+. Saturation index values, Mg2+, Ca2+, and HCO3 analyses indicated the preferential Ca2+ removal by calcite precipitation. Gibbs plots and stoichiometry plots indicated that the dissolved solutes were mainly derived from rock weathering with minor anthropogenic and atmospheric inputs. Samples in the northwestern basin are also influenced by evaporation. A forward model of mass budget calculation showed that, owing to high soluble characteristics, evaporite dissolution was a major feature of river waters and contributed 41% to the total dissolved cations on average, while carbonate and silicate weathering contributed 28%, and 25% on average, respectively. Besides evaporite dissolution, cation exchange is also responsible for the high concentrations of Na+ in river water. Spatial variations showed that evaporite dissolution and silicate weathering were higher in the northern basin, whereas carbonate weathering was higher in the southern basin. Different from most rivers in the world, the physical erosion rates (varying from 117.7 to 4116.6 t/km2y) are much higher than the chemical weathering rates (varying from 3.54 to 6.76 t/km2y) in the MLP because of the loose structure of loess and poor vegetation in the basin. In the future, studies on comparison of water geochemistry in different seasons and on influence of different types of land use and soil salinization on water geochemistry, denudation rates, and water quality should be strengthened in the MLP. These results shed some lights on processes responsible for modern loess weathering and also indicate the importance of time-series sampling strategy for river water chemistry. Copyright © 2016 John Wiley & Sons, Ltd.

DOI10.1002/hyp.10959
收录类别SCI
语种英语
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/5939
专题加速器质谱中心
作者单位1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, China;
2.Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi’an AMS Center, Xi’an 710061, China
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GB/T 7714
Xiao,J,Zhang,F,Jin,ZD. Spatial characteristics and controlling factors of chemicalweathering of loess in the dry season in the middle LoessPlateau, China[J]. HYDROLOGICAL PROCESSES,2016,30(2016):4855-4869.
APA Xiao,J,Zhang,F,&Jin,ZD.(2016).Spatial characteristics and controlling factors of chemicalweathering of loess in the dry season in the middle LoessPlateau, China.HYDROLOGICAL PROCESSES,30(2016),4855-4869.
MLA Xiao,J,et al."Spatial characteristics and controlling factors of chemicalweathering of loess in the dry season in the middle LoessPlateau, China".HYDROLOGICAL PROCESSES 30.2016(2016):4855-4869.
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