Isotopic signals of summer denitrification in a northern hardwood forested catchment

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dc.contributor.authorWexler, S. K.en
dc.contributor.authorGoodale, Christine L.en
dc.contributor.authorMcGuire, Kevin J.en
dc.contributor.authorBailey, Scott W.en
dc.contributor.authorGroffman, Peter M.en
dc.contributor.departmentForest Resources and Environmental Conservationen
dc.contributor.departmentVirginia Water Resources Research Centeren
dc.date.accessioned2017-01-12T01:24:22Zen
dc.date.available2017-01-12T01:24:22Zen
dc.date.issued2014-11-18en
dc.description.abstractDespite decades of measurements, the nitrogen balance of temperate forest catchments remains poorly understood. Atmospheric nitrogen deposition often greatly exceeds streamwater nitrogen losses; the fate of the remaining nitrogen is highly uncertain. Gaseous losses of nitrogen to denitrification are especially poorly documented and are often ignored. Here, we provide isotopic evidence (δ15NNO3 and δ18ONO3) from shallow groundwater at the Hubbard Brook Experimental Forest indicating extensive denitrification during midsummer, when transient, perched patches of saturation developed in hillslopes, with poor hydrological connectivity to the stream, while streamwater showed no isotopic evidence of denitrification. During small rain events, precipitation directly contributed up to 34% of streamwater nitrate, which was otherwise produced by nitrification. Together, these measurements reveal the importance of denitrification in hydrologically disconnected patches of shallow groundwater during midsummer as largely overlooked control points for nitrogen loss from temperate forest catchments.en
dc.description.versionPublished versionen
dc.format.extent16413 - 16418 (6) page(s)en
dc.identifier.doihttps://doi.org/10.1073/pnas.1404321111en
dc.identifier.issn0027-8424en
dc.identifier.issue46en
dc.identifier.orcidMcGuire, Kevin J. [0000-0001-5751-3956]en
dc.identifier.urihttp://hdl.handle.net/10919/74257en
dc.identifier.volume111en
dc.languageEnglishen
dc.publisherNational Academy of Sciencesen
dc.relation.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000345153300053&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=930d57c9ac61a043676db62af60056c1en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectnitrogen cycleen
dc.subjectdenitrificationen
dc.subjectstable isotopesen
dc.subjectforested watersheden
dc.subjectstreamwater chemistryen
dc.subjectBROOK EXPERIMENTAL FORESTen
dc.subjectBIOGEOCHEMICAL HOT-SPOTSen
dc.subjectHUBBARD-BROOKen
dc.subjectNEW-HAMPSHIREen
dc.subjectDENITRIFYING BACTERIAen
dc.subjectNITRITE OXIDATIONen
dc.subjectDELTA-O-18 VALUESen
dc.subjectNATURAL-ABUNDANCEen
dc.subjectRIPARIAN ZONESen
dc.subjectFRESH-WATERen
dc.titleIsotopic signals of summer denitrification in a northern hardwood forested catchmenten
dc.title.serialProceedings of the National Academy of Sciences of the United States of Americaen
dc.typeArticle - Refereeden
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Natural Resources & Environmenten
pubs.organisational-group/Virginia Tech/Natural Resources & Environment/CNRE T&R Facultyen
pubs.organisational-group/Virginia Tech/Natural Resources & Environment/Water Resources Research Centeren

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