anammox, denitrification and fixed-nitrogen removal in sediments from the lower st. lawrence estuary

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ID: 157447
2012
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Abstract
Incubations of intact sediment cores and sediment slurries reveal that anammox is an important sink for fixed nitrogen in sediments from the Lower St. Lawrence Estuary (LSLE), where it occurs at a rate of 5.5 &plusmn; 1.7 &micro;mol N m<sup>−2</sup> h<sup>−1</sup>. Canonical denitrification occurs at a rate of 11.3 &plusmn; 1.1 &micro;mol N m<sup>−2</sup> h<sup>−1</sup>, and anammox is thus responsible for up to 33% of the total N<sub>2</sub> production. Both anammox and denitrification are mostly (> 95%) fueled by nitrate and nitrite produced in situ through benthic nitrification. Nitrification accounts for > 15% of the benthic oxygen demand and may, therefore, contribute significantly to the development and maintenance of hypoxic conditions in the LSLE. The rate of dissimilatory nitrate reduction to ammonium is three orders of magnitude lower than denitrification and anammox, and it is insignificant to N-cycling. NH<sub>4</sub><sup>+</sup> oxidation by sedimentary Fe(III) and Mn(III/IV) in slurry incubations with N isotope labels did not occur at measurable rates; moreover, we found no evidence for NH<sub>4</sub><sup>+</sup> oxidation by added Mn(III)-pyrophosphate.
Reference Key
crowe2012biogeosciencesanammox, Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;S. A. Crowe;D. E. Canfield;A. Mucci;B. Sundby;R. Maranger
Journal tetrahedron letters
Year 2012
DOI
10.5194/bg-9-4309-2012
URL
http://www.biogeosciences.net/9/4309/2012/bg-9-4309-2012.pdf
Keywords
ecologylifegeology

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