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dc.contributor.authorLai, T.en
dc.contributor.authorDenton, M.en
dc.identifier.citationJournal of Soils and Sediments, 2018; 18(4):1548-1557en
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.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
pubs.library.collectionAgriculture, Food and Wine publicationsen
dc.identifier.orcidDenton, M. [0000-0002-2804-0384]en
Appears in Collections:Agriculture, Food and Wine publications

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