globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-015-0148-6
Scopus记录号: 2-s2.0-84948088919
论文题名:
Oxygenation of an anoxic fjord basin strongly stimulates benthic denitrification and DNRA
作者: De Brabandere L.; Bonaglia S.; Kononets M.Y.; Viktorsson L.; Stigebrandt A.; Thamdrup B.; Hall P.O.J.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 126, 期:2018-01-02
起始页码: 131
结束页码: 152
语种: 英语
英文关键词: Anammox ; By Fjord ; Denitrification ; Dissimilatory nitrate reduction ; DNRA ; Engineered oxygenation ; Hypoxia
英文摘要: Hypoxia hampers eutrophication reduction efforts by enabling high nutrient fluxes from sediment to bottom waters. Oxygenation of hypoxic water bodies is often proposed to reduce benthic ammonium and phosphate release. This study investigates the functional response of benthic nitrate-reducing processes to a long-term engineered oxygenation effort in a density-stratified fjord with euxinic bottom waters. Oxygenation was achieved by mixing surface water with deep, euxinic water, which increased oxygen and nitrate concentrations in the deep water column. The presence of nitrate instigated benthic nitrate reduction in the newly oxidized sediments by equally stimulating denitrification and dissimilatory nitrate reduction to ammonium (DNRA). DNRA and total nitrate reduction rates, as well as the contribution of DNRA to total nitrate reduction, decreased with increasing exposure time of the sediments to oxygen. The relative importance of DNRA as a nitrate sink was correlated to nitrate concentrations, with more nitrate being reduced to ammonium at higher bottom water nitrate concentrations. Overall, engineered oxygenation decreased the net efflux of dissolved inorganic nitrogen from the sediments by stimulating net nitrate removal through denitrification. © 2015, Springer International Publishing Switzerland.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83452
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Analytical and Environmental Geo-Chemistry, Vrije Universiteit Brussel, Brussels, Belgium; Nordic Center for Earth Evolution, Department of Biology, University of Southern Denmark, Odense, Denmark; Department of Geological Sciences, Stockholm University, Stockholm, Sweden; Department of Marine Sciences, University of Gothenburg, Gothenburg, Sweden; Department of Marine Sciences, University of Gothenburg, Box 460, Gothenburg, Sweden; Baltic Sea Centre, Stockholm University, Stockholm, Sweden

Recommended Citation:
De Brabandere L.,Bonaglia S.,Kononets M.Y.,et al. Oxygenation of an anoxic fjord basin strongly stimulates benthic denitrification and DNRA[J]. Biogeochemistry,2015-01-01,126(2018-01-02)
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