Nitrogen uptake,ammonium oxidation and nitrous oxide (N<sub>2</sub>O) levels in the coastal waters of western Cook Strait,New Zealand期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Nitrogen uptake,ammonium oxidation and nitrous oxide (N₂O) levels in the coastal waters of western Cook Strait,New Zealand

Authors:	John C Priscu Malcolm T Downes

Institution:	Taupo Research Laboratory, Division of Marine and Freshwater Science, DSIR, P.O.Box 415, Taupo, New Zealand

Abstract:	Vertical measurements of $NH_{4}^{+}$ , $NO_{3}^{?}$ and N₂O concentrations, $NO_{3}^{?}$ and $NH_{4}^{+}$ uptake, and $NH_{4}^{+}$ oxidation rates were measured at 5 sites in western Cook Strait, New Zealand, between 31 March and 3 April 1983. Nitrate increased with depth at all stations reaching a maximum of 10.5 μg-atom $NO_{3}^{?} N l^{?1}$ at the most strongly stratified station whereas $NH_{4}^{+}$ was relatively constant with depth at all stations (～0.1 μg-atom $NH_{4}^{+} N l^{?1}$ ). The highest rates of $NH_{4}^{+}$ oxidation generally occurred in the near surface waters and decreased with depth. N₂O levels were near saturation with respect to the air above the sea surface and showed no obvious changes during 24 h incubation. $NH_{4}^{+}$ oxidation by nitrifying bacteria may account for about 30% of the total $NH_{4}^{+}$ utilization (i.e. bacterial+agal) and, assuming oxidation through to $NO_{3}^{?}$ , may supply about 40% of the algal requirements of $NO_{3}^{?}$ in the study area. These results suggest that bacterial nitrification is of potential importance to the nitrogen dynamics of the western Cook Strait, particularly with respect to the nitrogen demands of the phytoplankton.

Keywords:	ammonium ions oxidation uptake upwelling nitrogen cycle
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