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dc.contributor.authorJahangir, Mohammad M. R.
dc.contributor.authorJohnson, P.
dc.contributor.authorKhalil, M.I.
dc.contributor.authorHennessy, D.
dc.contributor.authorHumphreys, James
dc.contributor.authorFenton, Owen
dc.contributor.authorRichards, Karl G.
dc.date.accessioned2013-08-07T13:43:07Z
dc.date.available2013-08-07T13:43:07Z
dc.date.issued16/07/2012
dc.identifier.citationJahangir, M. M. R.; Johnston, P.; Khalil, M. I.; Hennessy, D.; Humphreys, J.; Fenton, O.; Richards, K. G. Groundwater: A pathway for terrestrial C and N losses and indirect greenhouse gas emissions. Agriculture, Ecosystems & Environment, Volume 159, 15 September 2012, Pages 40-48. DOI: 10.1016/j.agee.2012.06.015en_GB
dc.identifier.issn0167-8809
dc.identifier.urihttp://hdl.handle.net/11019/412
dc.descriptionpeer-revieweden_GB
dc.description.abstractEstimating losses of dissolved carbon (C) and nitrogen (N) via groundwater in an agricultural system provides insights into reducing uncertainties in the terrestrial C and N balances. In addition, quantification of dissolved nitrous oxide (N2O), carbon dioxide (CO2) and methane (CH4) in groundwaters beneath agricultural systems is important for global greenhouse gas (GHG) budgets. Dissolved C (DC: dissolved organic carbon (DOC) + CO2-C + CH4-C) and dissolved nitrogen (DN: NO3−-N + NH4+ + NO2−-N + N2O-N + N2) in groundwater were measured in two low permeability (<0.02 m d−1) and two high permeability (>0.05 m d−1) aquifers in Ireland. Groundwater in multilevel piezometers was sampled monthly over two years. Mean groundwater discharge to surface water was higher in 2009 (587–836 mm) than in 2010 (326–385 mm). Dissolved C and N delivery to surface water via groundwater caused substantial losses of terrestrial C and N. The extent of delivery was site specific and depended on N input, recharge and aquifer permeability. Mean dissolved N losses ranged from 8–12% of N input in low permeability to 27–38% in high permeability aquifers. The dominant fraction of DN was NO3−-N (84–90% of DN) in high permeability aquifers and N2 (46–77% of DN) in low permeability aquifers. Indirect N2O emissions via groundwater denitrification accounted for 0.03–0.12% of N input, which was equivalent to 3–11% of total N2O emissions. Dissolved C loss to surface waters via groundwater was not significant compared to total carbon (TC) content of the topsoil (0.06–0.18% of TC). Site characteristics contributed greatly to the distribution of N between NO3−-N and dissolved N gases, N2O and N2. Indirect GHG emissions from groundwater were an important part of farm nutrient budgets, which clearly has implications for national GHG inventories.en_GB
dc.description.sponsorshipDepartment of Agriculture, Food and the Marine, Ireland - Research Stimulus Fund Programme (Grant RSF 06383); Department of Civil, Structural and Environmental Engineering, Trinity College Dublinen_GB
dc.language.isoenen_GB
dc.publisherElsevieren_GB
dc.relation.ispartofseriesAgriculture, Ecosystems & Environment;vol 159
dc.subjectGreenhouse gasesen_GB
dc.subjectIndirect N2O emissionsen_GB
dc.subjectEffective rainfallen_GB
dc.subjectDissolved Cen_GB
dc.subjectDissolved Nen_GB
dc.subjectGroundwateren_GB
dc.titleGroundwater: A pathway for terrestrial C and N losses and indirect greenhouse gas emissionsen_GB
dc.typeArticleen_GB
dc.identifier.rmis5605
dc.identifier.doihttp://dx.doi.org/10.1016/j.agee.2012.06.015
dc.contributor.sponsorDepartment of Agriculture, Food and the Marine, Ireland
dc.contributor.sponsorDepartment of Civil, Structural and Environmental Engineering, Trinity College Dublin
dc.contributor.sponsorGrantNumberRSF 06383
refterms.dateFOA2018-01-12T07:39:26Z


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