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Nitrogen and oxygen isotopic compositions of water-soluble nitrate in Taihu Lake water system, China: implication for nitrate sources and biogeochemical process
Chen, ZX (Chen, Zi-Xiang)[ 1,2,3,4 ]; Yu, L (Yu, Lei)[ 5 ]; Liu, WG (Liu, Wei-Guo)[ 2 ]; Lam, MHW (Lam, Michael H. W.)[ 3,4 ]; Liu, GJ (Liu, Gui-Jian)[ 1,3 ]; Yin, XB (Yin, Xue-Bin)[ 1,3 ]
2014-01-15
Source PublicationENVIRONMENTAL EARTH SCIENCES
Volume71Issue:1Pages:217-223
Subtype期刊论文
Abstract

The stable isotope nitrogen-15 (N-15) is a robust indicator of nitrogen (N) source, and the joint use of delta N-15 and delta O-18-NO3 (-) values can provide more useful information about nitrate source discrimination and N cycle process. The delta N-15 and delta O-18-NO3 (-) values, as well as major ion tracers, from Taihu Lake in east China were investigated to identify the primary nitrate sources and assess nitrate biogeochemical process in the present study. The results show that the nitrate concentration in West Taihu Lake (WTL) was generally higher than those in East Taihu Lake (ETL) and its upstream inflow rivers. The NO3 (-)/Cl- value combined with mapping of delta N-15-NO3 (-) and NO3 (-) concentration suggest that the mixing process should play a major effect in WTL, and denitrification was the dominant N transformation process in WTL. A linear relationship of close to similar to 1: 2 was observed between delta N-15-NO3 (-) and delta O-18-NO3 (-) values in WTL, confirming the occurrence of denitrification in WTL. The delta N-15-NO3 (-) data imply that sewage and manure were the principal nitrate sources in WTL and its feeder rivers, while the nitrate in ETL might derive from soil organic nitrogen and atmospheric deposition. The delta O-18-NO3 (-) data indicate most of nitrate from microbial nitrification of organic nitrogen matter possibly make a significant contribution to the lake.

KeywordDenitrification Dual Isotopes Nitrate Source Nitrification Taihu Lake
DOI10.1007/s12665-013-2425-9
Indexed BySCI ; EI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9694
Collection加速器质谱中心
Corresponding AuthorChen, ZX (Chen, Zi-Xiang)[ 1,2,3,4 ]; Liu, GJ (Liu, Gui-Jian)[ 1,3 ]; Yin, XB (Yin, Xue-Bin)[ 1,3 ]
Affiliation1.School of Earth and Space Science, University of Science andTechnology of China (USTC), Hefei 230026, Anhui, China;
2.State Key Laboratory of Loess and Quaternary Geology, IEE,CAS, Xi’an 710075, Shanxi, China;
3.Advanced Laboratory for Environmental Research andTechnology, Joint Advanced Research Center, USTC-City U,Suzhou 215123, Jiangsu, China;
4.Department of Biology and Chemistry, City University of HongKong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, China;
5.Key Laboratory of Soil Environment and Pollution Remediation,Institute of Soil Science, CAS, Nanjing 210008, China
Recommended Citation
GB/T 7714
Chen, ZX ,Yu, L ,Liu, WG ,et al. Nitrogen and oxygen isotopic compositions of water-soluble nitrate in Taihu Lake water system, China: implication for nitrate sources and biogeochemical process[J]. ENVIRONMENTAL EARTH SCIENCES,2014,71(1):217-223.
APA Chen, ZX ,Yu, L ,Liu, WG ,Lam, MHW ,Liu, GJ ,&Yin, XB .(2014).Nitrogen and oxygen isotopic compositions of water-soluble nitrate in Taihu Lake water system, China: implication for nitrate sources and biogeochemical process.ENVIRONMENTAL EARTH SCIENCES,71(1),217-223.
MLA Chen, ZX ,et al."Nitrogen and oxygen isotopic compositions of water-soluble nitrate in Taihu Lake water system, China: implication for nitrate sources and biogeochemical process".ENVIRONMENTAL EARTH SCIENCES 71.1(2014):217-223.
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