Koba L, Tokuchi N, Wada E, Nakajiama T, Iwatsubo G (1997) Intermittent denitrification: the application of a 15N natural abundance method to a forested ecosystem. In: Michener R, Lajtha K (eds) Stable isotopes in ecology and environmental science, 2nd edn. ![]() Kendall C, Elliott EM, Wankel SD (2008) Tracing anthropogenic inputs of nitrogen to ecosystems. In: Kendall C, McDonnell JJ (eds) Isotope tracers in catchment hydrology. Kendall C (1998) Tracing sources and cycling of nitrate in catchments. Karr JD, Showers WJ, Jennings GD (2003) Low-level nitrate export from confined dairy farming detected in North Carolina streams using δ 15N. Hollocher TC (1984) Sources of the oxygen atoms of nitrate in the oxidation of nitrate by Nitrobacter agilis and evidence against a P–O–N anhydride mechanism in oxidative phosphorylation. Wiley, New Yorkįukada T, Hiscock KM, Dennis PF (2004) A dual-isotope approach to the nitrogen hydrochemistry of urban aquifer. Biogeochemistry 94:163–174įaure G (1986) Principles of isotope geology. J Plankton Res 25:445–453Ĭhen FJ, Jia GD, Chen JY (2009) Nitrate sources and watershed denitrification inferred from nitrate dual isotopes in the Beijiang river, south China. ![]() J Contam Hydrol 37:45–67Ĭhen Y, Qin B, Teubner K, Dokulil MT (2003) Long-term dynamics of phytoplankton assemblages: micro-cystis domination in Lake Taihu, a large shallow lake in China. Water Resour Res 38:1051–1062Ĭey EE, Rudolph DL, Aravena R, Parkin G (1999) Role of the riparian zone in controlling the distribution and fate of agriculture nitrogen near a small stream in southern Ontario. Geochim Cosmochim Acta 51:2699–2750īurns DA, Kendall C (2002) Analysis of δ 15N and δ 18O to differentiate NO 3 − sources in runoff at two watersheds in the Catskill Mountains of New York. The δ 18O–NO 3 − data indicate most of nitrate from microbial nitrification of organic nitrogen matter possibly make a significant contribution to the lake.Īmberger A, Schmidt HL (1987) Naturliche isotopengehalte von nitrat als indikatoren für dessen Herkunft. The δ 15N–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. A linear relationship of close to ~1: 2 was observed between δ 15N–NO 3 − and δ 18O–NO 3 − values in WTL, confirming the occurrence of denitrification in WTL. ![]() ![]() The NO 3 −/Cl − value combined with mapping of δ 15N–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. 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 δ 15N and δ 18O–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 stable isotope nitrogen-15 ( 15N) is a robust indicator of nitrogen (N) source, and the joint use of δ 15N and δ 18O–NO 3 − values can provide more useful information about nitrate source discrimination and N cycle process.
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