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Isotopic indicators of carbon and nitrogen cycles in river catchments during soil erosion in the arid Loess Plateau of China
Liu, WG (Liu, Weiguo)[1,2]; Xing, M (Xing, Meng)[1,3]
2012-02-23
Source PublicationCHEMICAL GEOLOGY
Volume296Pages:66-72
Subtype期刊论文
Abstract

Water and soil erosion are serious issues in the Loess Plateau in China. The carbon and nitrogen cycles along river catchments during the soil erosion process have historically been poorly understood. In this study, we investigated the concentrations and isotopic signatures of carbon and nitrogen in river water, river-suspended materials and soil. Our results revealed that, in river catchments, from the water sources to their confluence with larger rivers, (1) the isotopic signatures of dissolved inorganic carbon (DIC) varied from -9.2 to -6.7%. in May and from -12.9 to -9.3%. in August. In addition, delta C-13(DIC) values were more negative in August than in May. These differences may be related to changes in the source and soil erosion. (2) The NO3- nitrogen isotopic signature of the water ranged from 5.1 to 10.3 parts per thousand in May and from 3.5 to 6.4 parts per thousand in August. The delta N-15(org) of the suspended material also became more positive; similar trends can help us to understand the N cycle during soil erosion. Our investigation suggests that soil CO2/carbonates and soil NO3- are dissolved into the Loess Plateau rivers during rainfall and soil erosion. The concentration and the isotopic signatures of carbon and nitrogen in rivers can be used for the quantitative evaluation of carbon and nitrogen transfer from the soil to the Loess Plateau rivers.

KeywordCarbon Nitrogen Isotope Soil Erosion Loess Plateau
DOI10.1016/j.chemgeo.2011.12.021
Indexed BySCI ; EI
Language英语
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Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/10102
Collection加速器质谱中心
Corresponding AuthorLiu, WG (Liu, Weiguo)[1,2]
Affiliation1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS, Xi'an, 710075, China;
2.School of Human Settlement and Civil Engineering, Xi'an Jiaotong University, Xi'an, 710049, China;
3.Graduate School of Chinese Academy of Sciences, Beijing, 100039, China
Recommended Citation
GB/T 7714
Liu, WG ,Xing, M . Isotopic indicators of carbon and nitrogen cycles in river catchments during soil erosion in the arid Loess Plateau of China[J]. CHEMICAL GEOLOGY,2012,296:66-72.
APA Liu, WG ,&Xing, M .(2012).Isotopic indicators of carbon and nitrogen cycles in river catchments during soil erosion in the arid Loess Plateau of China.CHEMICAL GEOLOGY,296,66-72.
MLA Liu, WG ,et al."Isotopic indicators of carbon and nitrogen cycles in river catchments during soil erosion in the arid Loess Plateau of China".CHEMICAL GEOLOGY 296(2012):66-72.
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