PMID: 18213972Jan 25, 2008Paper

Isotopic evidence for in-lake production of accumulating nitrate in Lake Superior

Ecological Applications : a Publication of the Ecological Society of America
Jacques C FinlaySanjeev Kumar

Abstract

A century-long increase in nitrate (NO3-) in the water column of Lake Superior is a classic example of recent nitrogen accumulation in ecosystems, but its cause and relationship to historical NO3- deposition is unknown. We used stable isotope ratios of oxygen and nitrogen in nitrate (delta18O-NO3 and delta15N-NO3) to examine its sources in this large lake, which represents 10% of the world's surficial liquid freshwater. The most parsimonious hypothesis to explain the rise in NO3- is that the lake is accruing NO3- deposited directly on the lake surface because it is too unproductive to completely assimilate all of it. Data for delta18O-NO3 in external sources and the water column, however, are inconsistent with this hypothesis. Instead, the isotopic evidence indicates strongly that the accumulating NO3- is almost entirely derived from nitrification occurring within the lake. While increases in atmospheric deposition of NO3- may have played a role in its buildup in the lake, other factors such as increases in NH4+ and dissolved organic nitrogen inputs from precipitation or rivers, increases in nitrogen fluxes from the sediments, and decreases in burial rates must also be considered as potential drivers of rising NO3-. The sustain...Continue Reading

References

Jun 25, 2002·Ambio·James N Galloway, Ellis B Cowling
Apr 29, 2004·Environmental Science & Technology·Greg MichalskiMark Thiemens
Oct 19, 2004·Environmental Science & Technology·John SpoelstraRay G Semkin
Jun 10, 2005·Environmental Pollution·B L SkjelkvåleA Worsztynowicz
Apr 1, 2001·Oecologia·Donald L Phillips, Jillian W Gregg

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Citations

Jan 20, 2011·Environmental Science and Pollution Research International·Angelika NestlerPhilip Taylor
Jun 28, 2018·Environmental Science and Pollution Research International·Haiyan ZhangCuiping Gao
Dec 17, 2019·The Science of the Total Environment·Martin Tsz-Ki TsuiSae Yun Kwon
Aug 18, 2020·Journal of Environmental Management·Xiaojuan GuoDefu Liu
Oct 16, 2021·The Science of the Total Environment·Dongmei Han, Matthew J Currell

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