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Influence of soil moisture on codenitrification fluxes from a urea-affected pasture soil *

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posted on 2023-05-04, 10:04 authored by Timothy Clough, Gary Lanigan, Cecile DeKlein, Md Sainur Samad, Sergio Morales, David Rex, Lars Bakken, Charlotte Johns, Leo Condron, Jim Grant, Karl Richards
Intensively managed agricultural pastures contribute to N2O and N2 fluxes resulting in detrimental environmental outcomes and poor N use efficiency, respectively. Besides nitrification, nitrifierdenitrification and heterotrophic denitrification, alternative pathways such as codenitrification also contribute to emissions under ruminant urine-affected soil. However, information on codenitrification is sparse. The objectives of this experiment were to assess the effects of soil moisture and soil inorganic-N dynamics on the relative contributions of codenitrification and denitrification (heterotrophic denitrification) to the N2O and N2 fluxes under a simulated ruminant urine event. Repacked soil cores were treated with 15N enriched urea and maintained at near saturation (−1 kPa) or field capacity (−10 kPa). Soil inorganic-N, pH, dissolved organic carbon, N2O and N2 fluxes were measured over 63 days. Fluxes of N2, attributable to codenitrification, were at a maximum when soil nitrite (NO2−) concentrations were elevated. Cumulative codenitrification was higher (P = 0.043) at −1 kPa. However, the ratio of codenitrification to denitrification did not differ significantly with soil moisture, 25.5 ± 15.8 and 12.9 ± 4.8% (stdev) at −1 and −10 kPa, respectively. Elevated soil NO2− concentrations are shown to contribute to codenitrification, particularly at −1 kPa. * An Author Correction to this article was published on 07 March 2018 - doi:10.1038/s41598-018-22645-7


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Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.


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Springer Nature

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Scientific Reports




Clough, T. J., Lanigan, G. J., DeKlein, C. A. M., Samad, M. S., Morales, S. E., Rex, D., … Richards, K. G. (2017). Influence of soil moisture on codenitrification fluxes from a urea-affected pasture soil. Scientific Reports, 7, 2185. doi:10.1038/s41598-017-02278-y


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