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Biotic and abiotic predictors of potential N2O emissions from denitrification in Irish grasslands soils: A national-scale field study

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dc.contributor.author Deveautour, C.
dc.contributor.author Rojas-Pinzon, P.A.
dc.contributor.author Veloso, M.
dc.contributor.author Rambaud, J.
dc.contributor.author Duff, A.M.
dc.contributor.author Wall, D.
dc.contributor.author Carolan, Rachael
dc.contributor.author Philippot, L.
dc.contributor.author Richards, K.G.
dc.contributor.author O’Flaherty, V.
dc.contributor.author Brennan, F.
dc.date.accessioned 2022-06-01T11:07:48Z
dc.date.available 2022-06-01T11:07:48Z
dc.date.issued 2022-03-21
dc.identifier http://hdl.handle.net/20.500.12518/446
dc.identifier.citation Deveautour, C., Rojas-Pinzon, P.A., Veloso, M., Rambaud, J., Duff, A.M., Wall, D., Carolan, R., Philippot, L., Richards, K.G., O’Flaherty, V. and Brennan, F. (2022) ‘Biotic and abiotic predictors of potential N2O emissions from denitrification in Irish grasslands soils: A national-scale field study’, Soil Biology and Biochemistry. Elsevier BV. doi:10.1016/j.soilbio.2022.108637. en_US
dc.identifier.issn 0038-0717
dc.identifier.uri https://doi.org/10.1016/j.soilbio.2022.108637
dc.description Publication history: Accepted - 18 March 2022; Published - 25 March 2022. en_US
dc.description.abstract Large-scale information regarding nitrous oxide (N2O) emissions is needed as an evidence base to underpin land use policy and mitigation approaches. However, the highly variable rates of denitrification make the prediction of N2O emission demanding. Here, we evaluated the role of abiotic and biotic factors on the potential denitrification of Irish soils, in order to identify the key factors regulating potential N2O emissions at a large scale. To do so, we collected 136 soil samples from 32 sites across Ireland, and characterised the soil physico-chemical properties, the prokaryotic and fungal community composition, the abundance of N-cycling genes and evaluated the soil potential nitrification, denitrification and end product N2O/(N2O + N2). We found large differences in soil potential denitrification between sites (up to 41.5 mg N2O–N kg􀀀 1 soil day􀀀 1) with most of the emissions released in the form of N2O rather than N2. Soils with highest potential nitrification rates also exhibited the highest potential denitrification rates, and similar parameters were linked to both processes. The factors most predictive of soil potential denitrification were soil physico-chemical properties and the prokaryotic community composition. Soil phosphorus content was as important for predicting potential denitrification as was pH and total nitrogen. Soil microbial community structure, rather than denitrifier abundance, was an important predictor of the potential denitrification and the end-product N2O/(N2O + N2). The prokaryotic community composition was more strongly associated with denitrification rates and the resulting end-products than fungal communities. Increased relative abundance of the prokaryotic phyla Actinobacteriota and Crenarchaeota, were positively correlated to complete denitrification. Altogether, these results lay the foundation for a better understanding of the key factors regulating the potential denitrification in soils and identify important properties that enhance prediction of the potential denitrification at larger scales. en_US
dc.description.sponsorship This research and CD, JR and PRP were financially supported under the National Development Plan, through the Research Stimulus Fund, administered by the Irish Department of Agriculture, Food and the Marine (Grant number 15S655: MINE project). en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.rights © 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync- nd/4.0/). en_US
dc.subject Denitrification en_US
dc.subject Nitrification en_US
dc.subject Functional N cycling Communities en_US
dc.subject Microbial community structure en_US
dc.subject Nitrous oxide en_US
dc.subject Managed grasslands en_US
dc.title Biotic and abiotic predictors of potential N2O emissions from denitrification in Irish grasslands soils: A national-scale field study en_US
dc.type Article en_US

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