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Redox oscillation and benthic nitrogen mineralization within burrowed sediments: An experimental simulation at low frequency

Gilbert, Franck and Hulth, Stefan and Grossi, Vincent and Aller, Robert Curwood Redox oscillation and benthic nitrogen mineralization within burrowed sediments: An experimental simulation at low frequency. (2016) Journal of Experimental Marine Biology and Ecology, 482. 75-84. ISSN 0022-0981

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Official URL: http://dx.doi.org/10.1016/j.jembe.2016.05.003

Abstract

Possible effects of sediment ventilation by benthic organisms on the nitrogen cycle were investigated using an experimental setup that mimicked stable or relatively low frequency oscillating redox conditions potentially found in bioturbated deposits. Three different conditions inside burrowed sediments were simulated using 2 mm thick sediment layers: 1) continuously oxic sediment exposed to oxygenated overlying bottom water (e.g., burrow walls, surface sediment), 2) continuously anoxic sediment out of reach from either O2 or NO3 − diffusion and 3) the lining/boundary of burrowstructures or sediment pockets (e.g., excavated during feeding) subject to intermittent irrigation and redox fluctuations over several day timescales. Results demonstrated that intermittent redox fluctuations allowed sustained denitrification and episodic nitrification, whereas significant denitrification and both nitrification and denitrification were absent after ~5–10 days from continuously oxidized and anoxic zones respectively. Intermittent redox oscillations enhance metabolic diversity, magnify loss of dissolved inorganic N to solution, and permit sustained coupling between ammonification, nitrification, and denitrification despite lack of a stable stratified oxic-anoxic redox structure. Even relatively low frequency redox oscillations induce greater N loss compared to sediment that is continuously exposed to oxic and anoxic conditions.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Journal of Experimental Marine Biology and Ecology website : http://www.sciencedirect.com/science/article/pii/S0022098116300831
HAL Id:hal-01449179
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Normale Supérieure de Lyon - ENS de Lyon (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université Claude Bernard-Lyon I - UCBL (FRANCE)
Other partners > Stony Brook University (USA)
Other partners > Göteborgs Universitet (SWEDEN)
Laboratory name:
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Deposited By: Franck Gilbert
Deposited On:12 Dec 2016 16:16

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