NDLI: Nitrogen and oxygen isotopic compositions of water-soluble nitrate in Taihu Lake water system, China: implication for nitrate sources and biogeochemical process

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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

Content Provider	Springer Nature Link
Author	Chen, Zi Xiang Yu, Lei Liu, Wei Guo Lam, Michael H. W. Liu, Gui Jian Yin, Xue Bin
Copyright Year	2013
Abstract	The stable isotope nitrogen-15 ($^{15}$N) is a robust indicator of nitrogen (N) source, and the joint use of δ$^{15}$N and δ$^{18}$O–NO$_{3}$ $^{−}$ values can provide more useful information about nitrate source discrimination and N cycle process. The δ$^{15}$N and δ$^{18}$O–NO$_{3}$ $^{−}$ 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 NO$_{3}$ $^{−}$/Cl$^{−}$ value combined with mapping of δ$^{15}$N–NO$_{3}$ $^{−}$ and NO$_{3}$ $^{−}$ 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 ~1: 2 was observed between δ$^{15}$N–NO$_{3}$ $^{−}$ and δ$^{18}$O–NO$_{3}$ $^{−}$ values in WTL, confirming the occurrence of denitrification in WTL. The δ$^{15}$N–NO$_{3}$ $^{−}$ 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 δ$^{18}$O–NO$_{3}$ $^{−}$ data indicate most of nitrate from microbial nitrification of organic nitrogen matter possibly make a significant contribution to the lake.
Starting Page	217
Ending Page	223
Page Count	7
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	71
Issue Number	1
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-04-02
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Denitrification Dual isotopes Nitrate source Nitrification Taihu lake Geology
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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