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Sediment Denitrification in Two Contrasting Tropical Shallow Lagoons
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences. University of Federal Rio de Janeiro, Brazil.
University of Federal Rio de Janeiro, Brazil.
University of Federal Rio de Janeiro, Brazil.
University of Aarhus, Denmark.
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2016 (English)In: Estuaries and Coasts, ISSN 1559-2723, E-ISSN 1559-2731, Vol. 39, no 3, 657-663 p.Article in journal (Refereed) PublishedText
Abstract [en]

Sediment denitrification was monthly evaluated in two tropical coastal lagoons with different trophic states using the N-15 isotope pairing technique. Denitrification rates were very low in both environments, always < 5.0 mu mol N-2 m(-2) h(-1) and were not significantly different between them. Oxygen consumption varied from 426 to 4248 mu mol O-2 m(-2) h(-1) and was generally three times higher in the meso-eutrophic than the oligotrophic lagoon. The low denitrification activity was ascribed to both low water NO3- concentrations (< 2.0 mu M) and little nitrate supply from nitrification. There was no correlation of denitrification with nitrate or ammonium fluxes. Sediments in temperate environments with similar oxygen consumption rates usually presented a higher proportion of nitrification-denitrification rates. Sediment oxygen consumption was a good predictor of sediment denitrification in both studied lagoons.

Place, publisher, year, edition, pages
SPRINGER , 2016. Vol. 39, no 3, 657-663 p.
Keyword [en]
Nitrogen; Denitrification; Oxygen consumption; Sediment; Tropical; Coastal lagoons
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:liu:diva-127546DOI: 10.1007/s12237-015-0017-5ISI: 000373360500005OAI: diva2:926209

Funding Agencies|FAPERJ; CAPES; CNPq; Petrobras; Inter-American Institute for Global Change Research

Available from: 2016-05-04 Created: 2016-05-03 Last updated: 2016-08-12

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