溶氧波动对湖泊沉积物氧化亚氮产生和氮物质转化的影响

doi:10.12066/j.issn.1007-2861.1837

Abstract

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.

Key words: dissolved oxygen, lake sediment, nitrous oxide, nitrogen

CLC Number:

X524

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（Natural Science Edition）, 2018, 24(4): 592-601.

Figures/Tables 7

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References 31

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

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