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Oxygenation of an anoxic fjord basin strongly stimulates benthic denitrification and DNRA

De Brabandere, Loreto; Bonaglia, Stefano LU ; Kononets, Mikhail Y.; Viktorsson, Lena; Stigebrandt, Anders; Thamdrup, Bo and Hall, Per O. J. (2015) In Biogeochemistry 126(1-2). p.131-152
Abstract
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).... (More)
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. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
By Fjord, Hypoxia, Engineered oxygenation, Anammox, DNRA, Denitrification, Dissimilatory nitrate reduction
in
Biogeochemistry
volume
126
issue
1-2
pages
131 - 152
publisher
Springer
external identifiers
  • wos:000365868400009
  • scopus:84948088919
ISSN
1573-515X
DOI
10.1007/s10533-015-0148-6
language
English
LU publication?
no
id
66629e6d-5833-4726-806f-ec5d9317dab3 (old id 8522742)
date added to LUP
2016-01-18 16:57:53
date last changed
2017-04-23 03:18:27
@article{66629e6d-5833-4726-806f-ec5d9317dab3,
  abstract     = {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.},
  author       = {De Brabandere, Loreto and Bonaglia, Stefano and Kononets, Mikhail Y. and Viktorsson, Lena and Stigebrandt, Anders and Thamdrup, Bo and Hall, Per O. J.},
  issn         = {1573-515X},
  keyword      = {By Fjord,Hypoxia,Engineered oxygenation,Anammox,DNRA,Denitrification,Dissimilatory nitrate reduction},
  language     = {eng},
  number       = {1-2},
  pages        = {131--152},
  publisher    = {Springer},
  series       = {Biogeochemistry},
  title        = {Oxygenation of an anoxic fjord basin strongly stimulates benthic denitrification and DNRA},
  url          = {http://dx.doi.org/10.1007/s10533-015-0148-6},
  volume       = {126},
  year         = {2015},
}