Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/128144
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dc.contributor.authorLai, T.en
dc.contributor.authorDenton, M.en
dc.date.issued2018en
dc.identifier.citationJournal of Soils and Sediments, 2018; 18(4):1548-1557en
dc.identifier.issn1439-0108en
dc.identifier.issn1614-7480en
dc.identifier.urihttp://hdl.handle.net/2440/128144-
dc.description.abstractPurpose: The reduction of nitrate (NO₃ˉ) to nitrous oxide (N₂O) and eventually to dinitrogen (N₂) during denitrification in soil has rarely been studied at temperatures above 30 °C. The aim of this study was to understand the impact of high temperatures on denitrification and associated N₂O/N₂ ratios in soil with different nitrogen (N) availability. Materials and methods: The study was conducted on a Dermosol collected from a dairy farm from south west Victoria, Australia (38° 10′ S, 142° 58′ E). Soil samples were wetted to 60% water holding capacity then pre-incubated at 25 °C for 7 days. Re-packed soil cores were supplied with different amounts of N (equivalent to 0, 50,100, and 150 kg N ha⁻¹) as ¹⁴NH₄ ¹⁵NO₃, 10 atom% excess ¹⁵N, and incubated at 25, 35, and 45 °C for 10 days. Gas samples were taken during the experiment to assess the reduction of NO₃ˉ to N₂O and eventually to N₂. Results and discussion: The majority of soil N losses during denitrification were from N₂O emissions, which were influenced by an interaction between temperature and N availability. The highest rate of N₂O emission occurred at 35 °C, in soils provided with N equivalent to 100 to 150 kg N ha⁻¹. A decrease in N₂O emissions above 35 °C was partially attributed to an increase in N₂O reduction, e.g., N₂ production, between 35 and 45 °C. Increased N₂ production at 45 °C decreased N₂O/N₂ ratios by 33 to 85%, resulting in ratios of 0.3 to 1.2. Temperature may have a direct effect on the reduction of NO₃ˉ to N₂O due to decreased oxygen availability with increasing soil respiration rates, thus enhancing the use of NO₃ˉ as a terminal electron acceptor by denitrifiers. Conclusions: Temperature interacted with soil N availability to control N₂O emission from denitrification, while the reduction of N₂O to N₂ also increased with temperature. Significant conversion of N₂O to N₂ above 35 °C decreased the N₂O/N₂ ratios from denitrification. Depletion of oxygen in soil microsites with higher temperatures appeared to influence N₂O production through selection of more NO₃ˉ acting as a terminal electron acceptor during denitrification.en
dc.description.statementofresponsibilityThang V. Lai, Matthew D. Dentonen
dc.language.isoenen
dc.publisherSpringer Natureen
dc.rights© Springer-Verlag GmbH Germany, part of Springer Nature 2017en
dc.subjectDinitrogen; N₂O/N₂ ratio; nitrogen transformation; nitrous oxide; oxygen; reduction of N₂Oen
dc.titleN₂O and N₂ emissions from denitrification respond differentially to soil temperatures and nitrogen supplyen
dc.title.alternativeN(2)O and N(2) emissions from denitrification respond differentially to soil temperatures and nitrogen supplyen
dc.typeJournal articleen
dc.identifier.rmid0030078610en
dc.identifier.doi10.1007/s11368-017-1863-5en
dc.identifier.pubid372722-
pubs.library.collectionAgriculture, Food and Wine publicationsen
pubs.library.teamDS14en
pubs.verification-statusVerifieden
pubs.publication-statusPublisheden
dc.identifier.orcidDenton, M. [0000-0002-2804-0384]en
Appears in Collections:Agriculture, Food and Wine publications

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