Nitrous oxide production in soil isolates of nitrate-ammonifying bacteria

Stremińska, Marta A., Felgate, Heather, Rowley, Gary, Richardson, David J. and Baggs, Elizabeth M. (2012) Nitrous oxide production in soil isolates of nitrate-ammonifying bacteria. Environmental Microbiology Reports, 4 (1). pp. 66-71. ISSN 1758-2229

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Abstract

Here we provide the first demonstration of the potential for N2O production by soil-isolated nitrate-ammonifying bacteria under different C and N availabilities, building on characterizations informed from model strains. The potential for soil-isolated Bacillus sp. and Citrobacter sp. to reduce NO3-, and produce NH4+, NO2- and N2O was examined in batch and continuous (chemostat) cultures under different C-to-NO3- ratios, NO3--limiting (5 mM) and NO3--sufficient (22 mM) conditions. C-to-NO3- ratio had a major influence on the products of nitrate ammonification, with NO2-, rather than NH4+, being the major product at low C-to-NO3- ratios in batch cultures. N2O production was maximum and accompanied by high NO2- production under C-limitation/NO3-sufficiency conditions in chemostat cultures. In media with lower C-to-NO3-N ratios (5- and 10-to-1) up to 2.7% or 5.0% of NO3- was reduced to N2O by Bacillus sp. and Citrobacter sp., respectively, but these reduction efficiencies were only 0.1% or 0.7% at higher C-to-NO3- ratios (25- and 50-to-1). As the highest N2O production did not occur under the same C-to-NO3- conditions as highest NH4+ production we suggest that a re-evaluation may be necessary of the environmental conditions under which nitrate ammonification contributes to N2O emission from soil.

Item Type: Article
Faculty \ School: Faculty of Science > School of Biological Sciences
Depositing User: Users 2731 not found.
Date Deposited: 09 Jan 2012 14:02
Last Modified: 24 Jul 2019 13:47
URI: https://ueaeprints.uea.ac.uk/id/eprint/35964
DOI: 10.1111/j.1758-2229.2011.00302.x

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