Dynamics of dissolved organic nitrogen in subalpine Castle Lake,California |
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| Authors: | J P Zehr S G Paulsen R P Axler C R Goldman |
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| Institution: | (1) Division of Environmental Studies, University of California, 95616 Davis, CA, USA;(2) Present address: Marine Science Research Center, State University of New York, 11794 Stony Brook, NY, USA |
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| Abstract: | Dissolved organic nitrogen (DON) concentrations were measured in meso-oligotrophic Castle Lake, California during the ice-free season in 1982, 1983 and 1984. No consistent relationships were found between DON and particulate-N, primary productivity rates or chlorophyll concentrations. However, increases in DON concentrations were observed in the early growing season of 1982 and 1984 when water temperature was rising and a diatom bloom was senescing. DON increased at a high rate (0.31 mg atom N m–3 day–1), and then rapidly disappeared. Sediment released appared to be the most important source of DON. Dissolved free amino acids were always less than 7.5% of the DON pool, and did not vary in the composition of specific amino acids during the growing season. |
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| Keywords: | dissolved organic matter nitrogen cycling subalpine lake |
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