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

上海大学学报(自然科学版) ›› 2018, Vol. 24 ›› Issue (4): 592-601.doi: 10.12066/j.issn.1007-2861.1837

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

梁霞¹(), 李彬彬¹, 孙弋祺¹, 张文静¹, 李卫平²

1. 上海大学环境与化学工程学院, 上海 200444
2. 内蒙古科技大学能源与环境学院, 内蒙古自治区包头, 014010

收稿日期:2016-08-20 出版日期:2018-08-31 发布日期:2018-08-31
通讯作者: 梁霞 E-mail:asituya@shu.edu.cn
基金资助:
国家重点研发计划课题资助项目(2016YFA0601003);国家自然科学基金资助项目(41773076);国家自然科学基金资助项目(41373097)

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

LIANG Xia¹(), LI Binbin¹, SUN Yiqi¹, ZHANG Wenjing¹, LI Weiping²

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:2016-08-20 Online:2018-08-31 Published:2018-08-31
Contact: LIANG Xia E-mail:asituya@shu.edu.cn

摘要/Abstract

摘要：

沉水植物光合呼吸作用能够造成浅水湖泊溶氧(dissolved oxygen, DO)浓度的昼夜变化, 并可能对湖泊氮物质转化和氧化亚氮(N$_{2}$O)排放产生影响. 研究了短期DO浓度变化对富营养化浅水湖泊沉积物N$_{2}$O产生和N物质转化的影响. 结果表明, 相对于空白对照组(DO浓度为3.0$\sim $4.0 mg/L时), 当处理组水体DO浓度昼夜波动为2.0$\sim $12.0 mg/L时, 水体N$_{2}$O浓度和沉积物N物质含量均出现显著变化, 其中处理组N$_{2}$O浓度显著高于空白对照组, 而氮气(N$_{2}$)浓度则明显降低. 此外, 处理组水体和沉积物总氮(total nitrogen, TN)和氨氮(NH$_{4}$-N)浓度均显著降低, 而硝态氮(NO$_{3}$-N)浓度则呈现增加趋势. 实验结束后, 处理组沉积物潜在氨氧化率、潜在亚硝酸氧化率、潜在硝化速率和潜在反硝化速率都显著上升.

关键词: 溶解氧, 湖泊沉积物, 氧化亚氮, 氮物质

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

中图分类号:

X524

梁霞, 李彬彬, 孙弋祺, 张文静, 李卫平. 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[J]. 上海大学学报(自然科学版), 2018, 24(4): 592-601.

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.

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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

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

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