Assessment of nitrous oxide emission factors for arable and grassland ecosystems
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 receiv...
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2020-12-01
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| Series: | Journal of Integrative Environmental Sciences |
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| Online Access: | http://dx.doi.org/10.1080/1943815X.2020.1825227 |
| _version_ | 1819098122980163584 |
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| author | M. O’Neill L. Gallego-Lorenzo G. J. Lanigan P. D. Forristal B. A. Osborne |
| author_facet | M. O’Neill L. Gallego-Lorenzo G. J. Lanigan P. D. Forristal B. A. Osborne |
| author_sort | M. O’Neill |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-22T00:25:58Z |
| format | Article |
| id | doaj.art-f03a5cda49394897b2d0dcdabd3af1d3 |
| institution | Directory Open Access Journal |
| issn | 1943-815X 1943-8168 |
| language | English |
| last_indexed | 2024-12-22T00:25:58Z |
| publishDate | 2020-12-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Journal of Integrative Environmental Sciences |
| spelling | doaj.art-f03a5cda49394897b2d0dcdabd3af1d32022-12-21T18:45:03ZengTaylor & Francis GroupJournal of Integrative Environmental Sciences1943-815X1943-81682020-12-0117316518510.1080/1943815X.2020.18252271825227Assessment of nitrous oxide emission factors for arable and grassland ecosystemsM. O’Neill0L. Gallego-Lorenzo1G. J. Lanigan2P. D. Forristal3B. A. Osborne4Environmental Research CentreUCD School of Biology of Environmental ScienceEnvironmental Research CentreCrops Research CentreUCD School of Biology of Environmental ScienceWe 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.http://dx.doi.org/10.1080/1943815X.2020.1825227n2oemission factortillageslurryarablegrassland |
| spellingShingle | M. O’Neill L. Gallego-Lorenzo G. J. Lanigan P. D. Forristal B. A. Osborne Assessment of nitrous oxide emission factors for arable and grassland ecosystems Journal of Integrative Environmental Sciences n2o emission factor tillage slurry arable grassland |
| title | Assessment of nitrous oxide emission factors for arable and grassland ecosystems |
| title_full | Assessment of nitrous oxide emission factors for arable and grassland ecosystems |
| title_fullStr | Assessment of nitrous oxide emission factors for arable and grassland ecosystems |
| title_full_unstemmed | Assessment of nitrous oxide emission factors for arable and grassland ecosystems |
| title_short | Assessment of nitrous oxide emission factors for arable and grassland ecosystems |
| title_sort | assessment of nitrous oxide emission factors for arable and grassland ecosystems |
| topic | n2o emission factor tillage slurry arable grassland |
| url | http://dx.doi.org/10.1080/1943815X.2020.1825227 |
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