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dc.contributor.authorMcAleer, E.B.
dc.contributor.authorCoxon, C.E.
dc.contributor.authorRichards, Karl G.
dc.contributor.authorJahangir, M.M.R
dc.contributor.authorGrant, J.
dc.contributor.authorMellander, Per-Erik
dc.date.accessioned2020-08-06T15:29:10Z
dc.date.available2020-08-06T15:29:10Z
dc.date.issued2017-05-15
dc.identifier.citationE.B. McAleer, C.E. Coxon, K.G. Richards, M.M.R Jahangir, J. Grant, Per.E. Mellander, Groundwater nitrate reduction versus dissolved gas production: A tale of two catchments, Science of The Total Environment, 2017, 586, 372-389. doi: https://doi.org/10.1016/j.scitotenv.2016.11.083en_US
dc.identifier.issn0048-9697
dc.identifier.urihttp://hdl.handle.net/11019/2280
dc.descriptionpeer-revieweden_US
dc.description.abstractAt the catchment scale, a complex mosaic of environmental, hydrogeological and physicochemical characteristics combine to regulate the distribution of groundwater and stream nitrate (NO3 −). The efficiency of NO3 − removal (via denitrification) versus the ratio of accumulated reaction products, dinitrogen (excess N2) & nitrous oxide (N2O), remains poorly understood. Groundwater was investigated in two well drained agricultural catchments (10 km2 ) in Ireland with contrasting subsurface lithologies (sandstone vs. slate) and landuse. Denitrification capacity was assessed by measuring concentration and distribution patterns of nitrogen (N) species, aquifer hydrogeochemistry, stable isotope signatures and aquifer hydraulic properties. A hierarchy of scale whereby physical factors including agronomy, water table elevation and permeability determined the hydrogeochemical signature of the aquifers was observed. This hydrogeochemical signature acted as the dominant control on denitrification reaction progress. High permeability, aerobic conditions and a lack of bacterial energy sources in the slate catchment resulted in low denitrification reaction progress (0–32%), high NO3 − and comparatively low N2O emission factors (EF5g1). In the sandstone catchment denitrification progress ranged from 4 to 94% and was highly dependent on permeability, water table elevation, dissolved oxygen concentration solid phase bacterial energy sources. Denitrification of NO3− to N2 occurred in anaerobic conditions, while at intermediate dissolved oxygen; N2O was the dominant reaction product. EF5g1 (mean: 0.0018) in the denitrifying sandstone catchment was 32% less than the IPCC default. The denitrification observations across catchments were supported by stable isotope signatures. Stream NO3 − occurrence was 32% lower in the sandstone catchment even though N loading was substantially higher than the slate catchment.en_US
dc.language.isoenen_US
dc.publisherElsevier BVen_US
dc.relation.ispartofseriesScience of the total environment;586
dc.rightsAttribution-ShareAlike 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-sa/3.0/us/*
dc.subjectDenitrificationen_US
dc.subjectExcess N2en_US
dc.subjectN2Oen_US
dc.subjectDissolved oxygenen_US
dc.subjectPollutant swappingen_US
dc.subjectAgricultureen_US
dc.titleGroundwater nitrate reduction versus dissolved gas production: A tale of two catchmentsen_US
dc.typeArticleen_US
dc.identifier.doihttps://doi.org/10.1016/j.scitotenv.2016.11.083
dc.contributor.sponsorTeagasc Walsh Fellowship Programmeen_US
dc.source.volume586
dc.source.beginpage372-389
refterms.dateFOA2020-08-06T15:29:11Z


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