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Coupling of carbon, nitrogen and oxygen cycles in sediments from a Mediterranean lagoon: a seasonal perspective

Dedieu, Karine and Rabouille, Christophe and Gilbert, Franck and Soetaert, Karline and Metzger, Edouard and Simonucci, Caroline and Jézéquel, Didier and Prévot, François and Anschutz, Pierre and Hulth, Stefan and Ogier, Sylvie and Mesnage, Valérie Coupling of carbon, nitrogen and oxygen cycles in sediments from a Mediterranean lagoon: a seasonal perspective. (2007) Marine Ecology Progress Series, vol. 346 . pp. 45-59. ISSN 0171-8630

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Official URL: http://dx.doi.org/10.3354/meps07031

Abstract

Experimental data and simulations were used to investigate the seasonal coupling between carbon, nitrogen and oxygen cycles in marine sediments from a eutrophic shallow lagoon in the Mediterranean Sea area. A negative seasonal correlation was observed between oxygen consumption and coupled nitrification–denitrification rates in surface sediments. Elevated values of oxygen consumption rates were reached during warm periods (up to 87.7 mmol m–2 d–1) whereas nitrification and denitrification rates remained close to the lowest rates reported for coastal sediments (values around 0.021 to 0.35 mmol N m–2 d–1 for nitrification and 0.014 to 0.045 mmol N m–2 d–1 for denitrification). A steady-state diagenetic model closely represented the seasonal negative correlation of oxygen uptake, coupled nitrification–denitrification rates, the vertical distribution patterns of pore water oxygen and the solid phase distribution of organic carbon when nitrification inhibition by sulfide was included. Simulation adjusted to field data also highlighted the importance of oxygen penetration depth in the seasonal variation of nitrification. The modelling indicated that anaerobic metabolism was the most significant pathway (65 to 80%) during organic matter mineralization with a clear seasonal increase during warm periods. These warm periods were also characterized by the higher benthic demand of oxygen mostly used to re-oxidize the by-products from anaerobic reactions (from 57 to 82%), the other part being used for carbon mineralization

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA
French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Université de Paris Diderot - Paris 7 (FRANCE)
Other partners > Université de Bordeaux 1 (FRANCE)
Other partners > Université de Rouen - UR (FRANCE)
Other partners > Université de Versailles Saint-Quentin-en-Yvelines -UVSQ (FRANCE)
Other partners > Université de Caen Basse-Normandie (FRANCE)
Other partners > Ecole Pratique des Hautes Etudes - EPHE (FRANCE)
Other partners > Royal Netherlands Academy of Arts and Sciences - KNAW (NETHERLANDS)
Other partners > Université de la Méditerranée - Aix-Marseille II (FRANCE)
Other partners > Université Montesquieu - Bordeaux 4 (FRANCE)
Other partners > Göteborgs Universitet (SWEDEN)
Laboratory name:
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Deposited By: Franck Gilbert
Deposited On:04 Oct 2012 12:34

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