Assessment of nitrous oxide emission factors for arable and grassland ecosystems

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Title: Assessment of nitrous oxide emission factors for arable and grassland ecosystems
Authors: O'Neill, M.Gallego-Lorenzo, L.Lanigan, GaryForristal, Patrick DermotOsborne, Bruce A.
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Date: 28-Oct-2020
Online since: 2021-11-09T16:52:11Z
Abstract: We quantified seasonal nitrous oxide (N2O) emissions and the associated emission factors (EFs) from: (i) winter oilseed rape (WOSR) cultivated under conventional tillage (CT) and strip tillage (ST) at four fertilizer rates (0, 160, 240 and 320 kg N ha−1) in 2014/2015, and (ii) grassland plots receiving no fertilizer (0 kg N ha−1), or mineral nitrogen (67 kg N ha−1), and either cattle or pig slurry (50, 100 and 200 m3 ha−1). Greater fluxes were observed at higher soil temperatures and a higher water filled pore space, suggesting that denitrification was the main source of N2O-N from the applied fertilizer/slurry. For WOSR, the N2O EFs ranged from 0.03 to 1.20% with no effect of the cultivation practice on EFs for equal rates of nitrogen fertilizer. Lower EF values were linked to differences in plant growth at individual sites rather than a specific management effect. For the grassland, the N2O EFs were highly variable, ranging from −0.70 to 0.49%, but were generally the highest in treatments receiving the highest concentrations of slurry. The EF values for WOSR illustrates that the Tier 1 approach for calculating EFs may be inadequate and the identification of site-specific effects can aid in refining N2O EF inventories. For the grassland plots all the EFs were significantly lower than the IPCC default values. Although the reason(s) for the low EFs with slurry amendments on grassland is not known, ammonia volatilization could decrease the pool of inorganic N that is available to nitrifying bacteria thereby lowering N2O fluxes.
Funding Details: Teagasc
Type of material: Journal Article
Publisher: Taylor & Francis
Journal: Journal of Integrative Environmental Sciences
Volume: 17
Issue: 3
Start page: 165
End page: 185
Copyright (published version): 2020 the Authors
Keywords: N2OEmission factorTillageSlurryArableGrassland
DOI: 10.1080/1943815x.2020.1825227
Language: en
Status of Item: Peer reviewed
ISSN: 1943-815X
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Appears in Collections:Biology & Environmental Science Research Collection
Earth Institute Research Collection

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