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Tracing nitrate sources with dual isotopes and long term monitoring of nitrogen species in the Yellow River, China
Fu-Jun Yue;  Si-Liang Li;  Cong-Qiang Liu;  Zhi-Qi Zhao;  Hu Ding
2017
Source PublicationScientific Reports
Volume7
Abstract

A heavy load of nitrogenous compounds reflects nutrient loss and influences water quality in large rivers. Nitrogenous concentrations and dual isotopes of nitrate were measured to ascertain the spatial and temporal distributions of nitrate transformation in the Yellow River, the second-longest river in China. Assessment of the long-term record indicates that [ NO3 (-)- N] has increased by two-fold over the past three decades. Weekly observation of ammonium over a twelve- year period revealed high concentrations and suggests impairment of water quality, particularly since 2011. The estimated total dissolved nitrogen flux was 7.2 times higher in middle reaches than that at head waters. Anthropogenic nitrogen sources become more important in lower section of the upper reaches and middle reaches because of intensive agricultural activities and urban input. Nitrate in the lower reaches was mainly derived from transportation of upstream nitrate and point sources from cities. The spatial variation of ammonium and nitrate isotopes show that nitrification is a key process governing nitrogen transformation. Riverine biological processes could potentially be responsible for the shift of nitrate isotope signature. The first step to reducing nitrogen load and improving water quality will be containment and careful management of sources from urban input, sewage waste and irrigation runoff.

Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/7742
Collection环境地球化学国家重点实验室
Affiliation1.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Guizhou, Peoples R China
2.Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin 300072, Peoples R China
3.Univ Glasgow, Sch Geog & Earth Sci, Glasgow G12 8QQ, Lanark, Scotland
First Author Affilication中国科学院地球化学研究所
Corresponding Author Affilication中国科学院地球化学研究所
Recommended Citation
GB/T 7714
Fu-Jun Yue;Si-Liang Li;Cong-Qiang Liu;Zhi-Qi Zhao;Hu Ding. Tracing nitrate sources with dual isotopes and long term monitoring of nitrogen species in the Yellow River, China[J]. Scientific Reports,2017,7.
APA Fu-Jun Yue;Si-Liang Li;Cong-Qiang Liu;Zhi-Qi Zhao;Hu Ding.(2017).Tracing nitrate sources with dual isotopes and long term monitoring of nitrogen species in the Yellow River, China.Scientific Reports,7.
MLA Fu-Jun Yue;Si-Liang Li;Cong-Qiang Liu;Zhi-Qi Zhao;Hu Ding."Tracing nitrate sources with dual isotopes and long term monitoring of nitrogen species in the Yellow River, China".Scientific Reports 7(2017).
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