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

Intensively managed agricultural pastures contribute to N(2)O and N(2) fluxes resulting in detrimental environmental outcomes and poor N use efficiency, respectively. Besides nitrification, nitrifier-denitrification and heterotrophic denitrification, alternative pathways such as codenitrification al...

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Autores principales: Clough, Timothy J., Lanigan, Gary J., de Klein, Cecile A. M., Samad, Md. Sainur, Morales, Sergio E., Rex, David, Bakken, Lars R., Johns, Charlotte, Condron, Leo M., Grant, Jim, Richards, Karl G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5438400/
https://www.ncbi.nlm.nih.gov/pubmed/28526821
http://dx.doi.org/10.1038/s41598-017-02278-y
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author Clough, Timothy J.
Lanigan, Gary J.
de Klein, Cecile A. M.
Samad, Md. Sainur
Morales, Sergio E.
Rex, David
Bakken, Lars R.
Johns, Charlotte
Condron, Leo M.
Grant, Jim
Richards, Karl G.
author_facet Clough, Timothy J.
Lanigan, Gary J.
de Klein, Cecile A. M.
Samad, Md. Sainur
Morales, Sergio E.
Rex, David
Bakken, Lars R.
Johns, Charlotte
Condron, Leo M.
Grant, Jim
Richards, Karl G.
author_sort Clough, Timothy J.
collection PubMed
description Intensively managed agricultural pastures contribute to N(2)O and N(2) fluxes resulting in detrimental environmental outcomes and poor N use efficiency, respectively. Besides nitrification, nitrifier-denitrification 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 N(2)O and N(2) fluxes under a simulated ruminant urine event. Repacked soil cores were treated with (15)N enriched urea and maintained at near saturation (−1 kPa) or field capacity (−10 kPa). Soil inorganic-N, pH, dissolved organic carbon, N(2)O and N(2) fluxes were measured over 63 days. Fluxes of N(2), attributable to codenitrification, were at a maximum when soil nitrite (NO(2)(−)) 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 NO(2)(−) concentrations are shown to contribute to codenitrification, particularly at −1 kPa.
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spelling pubmed-54384002017-05-22 Influence of soil moisture on codenitrification fluxes from a urea-affected pasture soil Clough, Timothy J. Lanigan, Gary J. de Klein, Cecile A. M. Samad, Md. Sainur Morales, Sergio E. Rex, David Bakken, Lars R. Johns, Charlotte Condron, Leo M. Grant, Jim Richards, Karl G. Sci Rep Article Intensively managed agricultural pastures contribute to N(2)O and N(2) fluxes resulting in detrimental environmental outcomes and poor N use efficiency, respectively. Besides nitrification, nitrifier-denitrification 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 N(2)O and N(2) fluxes under a simulated ruminant urine event. Repacked soil cores were treated with (15)N enriched urea and maintained at near saturation (−1 kPa) or field capacity (−10 kPa). Soil inorganic-N, pH, dissolved organic carbon, N(2)O and N(2) fluxes were measured over 63 days. Fluxes of N(2), attributable to codenitrification, were at a maximum when soil nitrite (NO(2)(−)) 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 NO(2)(−) concentrations are shown to contribute to codenitrification, particularly at −1 kPa. Nature Publishing Group UK 2017-05-19 /pmc/articles/PMC5438400/ /pubmed/28526821 http://dx.doi.org/10.1038/s41598-017-02278-y Text en © The Author(s) 2017 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. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Clough, Timothy J.
Lanigan, Gary J.
de Klein, Cecile A. M.
Samad, Md. Sainur
Morales, Sergio E.
Rex, David
Bakken, Lars R.
Johns, Charlotte
Condron, Leo M.
Grant, Jim
Richards, Karl G.
Influence of soil moisture on codenitrification fluxes from a urea-affected pasture soil
title Influence of soil moisture on codenitrification fluxes from a urea-affected pasture soil
title_full Influence of soil moisture on codenitrification fluxes from a urea-affected pasture soil
title_fullStr Influence of soil moisture on codenitrification fluxes from a urea-affected pasture soil
title_full_unstemmed Influence of soil moisture on codenitrification fluxes from a urea-affected pasture soil
title_short Influence of soil moisture on codenitrification fluxes from a urea-affected pasture soil
title_sort influence of soil moisture on codenitrification fluxes from a urea-affected pasture soil
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5438400/
https://www.ncbi.nlm.nih.gov/pubmed/28526821
http://dx.doi.org/10.1038/s41598-017-02278-y
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