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Balk M, Laverman AM, Keuskamp JA, et al. Nitrate ammonification in mangrove soils: a hidden source of nitrite?. Front Microbiol. 2015;6:166doi: 10.3389/fmicb.2015.00166.
Balk, M., Laverman, A. M., Keuskamp, J. A., & Laanbroek, H. J. (2015). Nitrate ammonification in mangrove soils: a hidden source of nitrite?. Frontiers in microbiology, 6166. https://doi.org/10.3389/fmicb.2015.00166
Balk, Melike, et al. "Nitrate ammonification in mangrove soils: a hidden source of nitrite?." Frontiers in microbiology vol. 6 (2015): 166. doi: https://doi.org/10.3389/fmicb.2015.00166
Balk M, Laverman AM, Keuskamp JA, Laanbroek HJ. Nitrate ammonification in mangrove soils: a hidden source of nitrite?. Front Microbiol. 2015 Mar 02;6:166. doi: 10.3389/fmicb.2015.00166. eCollection 2015. PMID: 25784903; PMCID: PMC4345912.
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Front Microbiol. 2015 Mar 02;6:166. doi: 10.3389/fmicb.2015.00166. eCollection 2015.

Nitrate ammonification in mangrove soils: a hidden source of nitrite?.

Frontiers in microbiology

Melike Balk, Anniet M Laverman, Joost A Keuskamp, Hendrikus J Laanbroek

Affiliations

  1. Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW) Netherlands ; Faculty of Geosciences, Utrecht University Utrecht, Netherlands.
  2. CNRS EcoBio UMR6553, Université Rennes 1 Rennes, France.
  3. Ecology and Biodiversity Group, Institute of Environmental Biology, Utrecht University Utrecht, Netherlands.
  4. Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW) Netherlands ; Ecology and Biodiversity Group, Institute of Environmental Biology, Utrecht University Utrecht, Netherlands.

PMID: 25784903 PMCID: PMC4345912 DOI: 10.3389/fmicb.2015.00166

Abstract

Nitrate reduction is considered to be a minor microbial pathway in the oxidation of mangrove-derived organic matter due to a limited supply of nitrate in mangrove soils. At a limited availability of this electron acceptor compared to the supply of degradable carbon, nitrate ammonification is thought to be the preferential pathway of nitrate reduction. Mangrove forest mutually differ in their productivity, which may lead to different available carbon to nitrate ratios in their soil. Hence, nitrate ammonification is expected to be of more importance in high- compared to low-productive forests. The hypothesis was tested in flow-through reactors that contain undisturbed mangrove soils from high-productive Avicennia germinans and Rhizophora mangle forests in Florida and low-productive Avicennia marina forests in Saudi Arabia. Nitrate was undetectable in the soils from both regions. It was assumed that a legacy of nitrate ammonification would be reflected by a higher ammonium production from these soils upon the addition of nitrate. Unexpectedly, the soils from the low-productive forests in Saudi Arabia produced considerably more ammonium than the soils from the high-productive forests in Florida. Hence, other environmental factors than productivity must govern the selection of nitrate ammonification or denitrification. A rather intriguing observation was the 1:1 production of nitrite and ammonium during the consumption of nitrate, more or less independent from sampling region, location, sampling depth, mangrove species and from the absence or presence of additional degradable carbon. This 1:1 ratio points to a coupled production of ammonium and nitrite by one group of nitrate-reducing microorganisms. Such a production of nitrite will be hidden by the presence of active nitrite-reducing microorganisms under the nitrate-limited conditions of most mangrove forest soils.

Keywords: ammonium production; mangrove soil; nitrate reduction; nitrite production

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