Significance of low-oxygen zone for nitrogen cycling in a freshwater lake: Production of N2O by simultaneous denitrification and nitrification.
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Denitrifying and nitrifying activities were determined to elucidate the mechanism of N<SUB>2</SUB>O accumulation in the oxygen depleted zone of Lake Kizaki. Both activities were detected without any substrate enrichments in a zone of low-oxygen content (0.03-0.14 ml·<SUP>-1</SUP>), where N<SUB>2</SUB>O and NO<SUB>2</SUB><SUP>-</SUP>were accumulated. The determined nitrifying activity approximately coincided with the NH<SUB>4</SUB><SUP>+</SUP> utilization estimated from the NH<SUB>4</SUB><SUP>+</SUP> budget in this zone during the observation interval. On the basis of these activities and the change in N<SUB>2</SUB>O concentation, it was suggested that the observed N<SUB>2</SUB>O accumulation had dual origins of nitrification and denitirification and that these productions were in a dynamic equilibrium with further reduction of N<SUB>2</SUB>O to N<SUB>2</SUB>. The low-oxygen zone was found to be an active site for nitrogen cycling and was characterized by the presence of dissolved Mn and the absences of dissolved Fe and sulfide.
- 日本陸水学会の論文
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