Sediment Denitrification in Two Contrasting Tropical Shallow Lagoons
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
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.
Nitrogen; Denitrification; Oxygen consumption; Sediment; Tropical; Coastal lagoons
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:liu:diva-127546DOI: 10.1007/s12237-015-0017-5ISI: 000373360500005OAI: oai:DiVA.org:liu-127546DiVA: diva2:926209
Funding Agencies|FAPERJ; CAPES; CNPq; Petrobras; Inter-American Institute for Global Change Research2016-05-042016-05-032016-08-12