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Volume 8, issue 7
Biogeosciences, 8, 1779–1791, 2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Stable isotopes and biogeochemical cycles in terrestrial...

Biogeosciences, 8, 1779–1791, 2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Reviews and syntheses 08 Jul 2011

Reviews and syntheses | 08 Jul 2011

Assessment of the importance of dissimilatory nitrate reduction to ammonium for the terrestrial nitrogen cycle

T. Rütting1, P. Boeckx2, C. Müller3,4, and L. Klemedtsson1 T. Rütting et al.
  • 1Department of Plant and Environmental Sciences, University of Gothenburg, Box 461, 405 30 Gothenburg, Sweden
  • 2Laboratory of Applied Physical Chemistry - ISOFYS, Ghent University, Coupure 653, 9000 Gent, Belgium
  • 3Department of Plant Ecology, Justus-Liebig University Giessen, Heinrich-Buff-Ring 26, 35392 Giessen, Germany
  • 4School of Biology and Environmental Sciences, University College Dublin, Belfield, Dublin 4, Ireland

Abstract. The nitrogen (N) cycle contains two different processes of dissimilatory nitrate (NO3) reduction, denitrification and dissimilatory NO3 reduction to ammonium (DNRA). While there is general agreement that the denitrification process takes place in many soils, the occurrence and importance of DNRA is generally not considered. Two approaches have been used to investigate DNRA in soil, (1) microbiological techniques to identify soil microorganisms capable of DNRA and (2) 15N tracing to elucidate the occurrence of DNRA and to quantify gross DNRA rates. There is evidence that many soil bacteria and fungi have the ability to perform DNRA. Redox status and C/NO3 ratio have been identified as the most important factors regulating DNRA in soil. 15N tracing studies have shown that gross DNRA rates can be a significant or even a dominant NO3 consumption process in some ecosystems. Moreover, a link between heterotrophic nitrification and DNRA provides an alternative pathway of ammonium (NH4+) production to mineralisation. Numerical 15N tracing models are particularly useful when investigating DNRA in the context of other N cycling processes. The results of correlation and regression analyses show that highest gross DNRA rates can be expected in soils with high organic matter content in humid regions, while its relative importance is higher in temperate climates. With this review we summarise the importance and current knowledge of this often overlooked NO3 consumption process within the terrestrial N cycle. We strongly encourage considering DNRA as a relevant process in future soil N cycling investigations.

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