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Using a nitrogen and oxygen isotopic approach to identify nitrate sources and cycling in the Wei River of northwestern China
Hu, Jing1,2; Liu, Weiguo1,3; Xing, Meng1; Li, Yuliang4
Corresponding AuthorLiu, Weiguo(liuwg@loess.llqg.ac.cn)
2019-04-03
Source PublicationHUMAN AND ECOLOGICAL RISK ASSESSMENT
ISSN1080-7039
Volume25Issue:3Pages:755-771
AbstractThe Wei River is the largest tributary of the Yellow River in China. To understand the sources and cycling of nitrate in the Wei River, we determined the concentrations and nitrogen and oxygen isotopic values of nitrate from water samples. Our results revealed that NO3--N dominated the inorganic N and ranged from 0.1 to 8.8 mg/L (averaging 3.3 mg/L). Although this NO3--N concentration does not exceed the World Health Organization's drinking water standard of 10 mg/L, the NO3--N content of most water samples exceeded 3 mg/L, indicating poor water quality. The NO3--N concentrations and delta N-15-NO3- values demonstrate that there are significant differences in the spatial distribution of nitrogen between the tributaries and the main stream of the Wei River. In addition, a negative linear relationship (r(2) = 0.63) between NO3--N concentrations and delta O-18-NO3- values suggests mixing between two distinct sources (fertilizer and manure or sewage). Furthermore, we infer that the main source of nitrate is not manure or sewage itself, but rather the nitrification of NH4+ in manure and sewage. Finally, no obvious denitrification processes were observed. These results expand our understanding of sewage as a major source of nitrate to the Wei River, emphasizing the role of nitrification.
Keywordnitrogen isotopes oxygen isotopes nitrate tracing nitrogen sources Wei River
DOI10.1080/10807039.2018.1451744
WOS KeywordLOESS PLATEAU ; GROUND-WATER ; DUAL-ISOTOPE ; LAND USES ; TRANSFORMATIONS ; DELTA-O-18 ; SYSTEM ; SOIL ; NITRIFICATION ; FRACTIONATION
Indexed BySCI ; SCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41373022] ; National Natural Science Foundation of China[41303011] ; Fundamental Research Funds for the Central Universities[310829161112] ; Chinese Academy of Sciences Light of West China Program
WOS Research AreaBiodiversity & Conservation ; Environmental Sciences & Ecology
Funding OrganizationNational Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Chinese Academy of Sciences Light of West China Program
WOS SubjectBiodiversity Conservation ; Environmental Sciences
WOS IDWOS:000472106200016
PublisherTAYLOR & FRANCIS INC
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Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/13822
Collection加速器质谱中心
Corresponding AuthorLiu, Weiguo
Affiliation1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian, Shaanxi, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Xi An Jiao Tong Univ, Sch Human Settlement & Civil Engn, Xian, Shaanxi, Peoples R China
4.Changan Univ, Coll Environm Sci & Engn, Xian, Shaanxi, Peoples R China
Recommended Citation
GB/T 7714
Hu, Jing,Liu, Weiguo,Xing, Meng,et al. Using a nitrogen and oxygen isotopic approach to identify nitrate sources and cycling in the Wei River of northwestern China[J]. HUMAN AND ECOLOGICAL RISK ASSESSMENT,2019,25(3):755-771.
APA Hu, Jing,Liu, Weiguo,Xing, Meng,&Li, Yuliang.(2019).Using a nitrogen and oxygen isotopic approach to identify nitrate sources and cycling in the Wei River of northwestern China.HUMAN AND ECOLOGICAL RISK ASSESSMENT,25(3),755-771.
MLA Hu, Jing,et al."Using a nitrogen and oxygen isotopic approach to identify nitrate sources and cycling in the Wei River of northwestern China".HUMAN AND ECOLOGICAL RISK ASSESSMENT 25.3(2019):755-771.
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