Research Articles

Effects of diurnal variation of dissolved oxygen on nitrous oxide production and nitrogen cycling in lake sediments

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  • 1. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China
    2. School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia Autonomous Region, China

Received date: 2016-08-20

  Online published: 2018-08-31

Abstract

Photosynthesis and respiration of submerged macrophytes play important roles in determining the diurnal variation of dissolved oxygen (DO) concentrations in shallow lakes. This diel DO variation can in turn affect nitrous oxide (N$_{2}$O) emissions and nitrogen (N) cycling in lakes. Batch experiments were performed to measure N$_{2}$O and nitrogen concentrations with varied DO concentrations. Sediment cores are collected from a large, shallow eutrophic lake with submerged macrophytes enriched in the lake. Higher N$_{2}$O and lower nitrogen gas (N$_{2})$ concentrations were observed at the diurnal varied DO concentrations (2.0$\sim$12.0 mg/L) as compared with the relative steady DO concentration (3.0$\sim$ 4.0 mg/L) tests. The diurnal varied DO concentrations in this study showed significant promoted effect on total nitrogen (TN) and ammonia nitrogen (NH$_{4}$-N) removal. It was found that the major cause of more N$_{2}$O production and higher TN removal at varied DO concentration was due to higher nitrification and denitrification rates. The results of this study suggest that diurnal varied DO concentration may increase N$_{2}$O emission and promote N removal from shallow eutrophic lakes.

Cite this article

LIANG Xia, LI Binbin, SUN Yiqi, ZHANG Wenjing, LI Weiping . Effects of diurnal variation of dissolved oxygen on nitrous oxide production and nitrogen cycling in lake sediments[J]. Journal of Shanghai University, 2018 , 24(4) : 592 -601 . DOI: 10.12066/j.issn.1007-2861.1837

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