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    Groundwater: A pathway for terrestrial C and N losses and indirect greenhouse gas emissions

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    Author
    Jahangir, Mohammad M. R.
    Johnston, Paul
    Khalil, Mohammed I.
    Hennessy, Deirdre cc
    Humphreys, James
    Fenton, Owen
    Richards, Karl G.
    Keyword
    Greenhouse gases
    Indirect N2O emissions
    Effective rainfall
    Dissolved C
    Dissolved N
    Groundwater
    Date
    16/07/2012
    
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    URI
    http://hdl.handle.net/11019/412
    Citation
    Jahangir, 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.2012.06.015
    Abstract
    Estimating 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.
    Funder
    Department of Agriculture, Food and the Marine, Ireland; Department of Civil, Structural and Environmental Engineering, Trinity College Dublin
    Grant Number
    RSF 06383
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.1016/j.agee.2012.06.015
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    Environment, Soils & Land Use
    Environment, Soils & Land Use
    Environment, Soils & Land Use
    Livestock Systems

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