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Identifying Controls on Nitrate Sources and Flowpaths in a Forested Catchment Using a Hydropedological Framework

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dc.contributor.authorPardo, Linda H.en
dc.contributor.authorGreen, M. B.en
dc.contributor.authorBailey, S. W.en
dc.contributor.authorMcGuire, Kevin J.en
dc.contributor.authorMcDowell, W. H.en
dc.date.accessioned2022-04-12T11:48:29Zen
dc.date.available2022-04-12T11:48:29Zen
dc.date.issued2022-02-01en
dc.date.updated2022-04-12T11:10:49Zen
dc.description.abstractCatchment-scale assessments of nitrogen retention and loss rarely account for soil and landscape heterogeneity and are, thus, unable to account for the suite of nitrogen cycling processes that ultimately affect the export of nitrate via stream water. Long-term study at the Hubbard Brook Experimental Forest, NH has generated a unique data set that facilitates spatially explicit examination of interactions among hydrology, soil development, and nitrogen cycling processes. Using high-frequency streamwater chemistry data with intensive subsurface hydrology and solute monitoring, we tracked areas of the catchment that are hydrologically active under different flow conditions to identify the source area of streamwater nitrate. We hypothesize that as the drainage network expands, increasing hydrologic connection to bedrock outcrop-associated soils, streamwater nitrate concentration, and flux at the catchment outlet increase. Most nitrate export (>80%) occurred during high flows when high nitrate, bedrock-controlled areas of the catchment were most connected hydrologically to the drainage network (∼15% of the time). End-member mixing analysis demonstrated that the bedrock-controlled upper part of the catchment influences nitrate concentration at the outlet and contributes most to catchment nitrate export compared to the near-stream soil units and seeps. Most of the time, nitrate at the catchment outlet comes from seeps and the near-stream zone; under high flow conditions, bedrock-controlled hotspots for nitrate production contribute more to export of nitrate. This analysis demonstrates how the source area of streamwater nitrate varies under different flow conditions, suggesting that long-term nitrate dynamics may be driven primarily by a relatively small part of the catchment.en
dc.description.versionAccepted versionen
dc.format.extent20 page(s)en
dc.format.mimetypeapplication/pdfen
dc.identifierARTN e2020JG006140 (Article number)en
dc.identifier.doihttps://doi.org/10.1029/2020JG006140en
dc.identifier.eissn2169-8961en
dc.identifier.issn2169-8953en
dc.identifier.issue2en
dc.identifier.urihttp://hdl.handle.net/10919/109646en
dc.identifier.volume127en
dc.language.isoenen
dc.publisherAmerican Geophysical Unionen
dc.relation.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000763471300017&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=930d57c9ac61a043676db62af60056c1en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectEnvironmental Sciencesen
dc.subjectGeosciences, Multidisciplinaryen
dc.subjectEnvironmental Sciences & Ecologyen
dc.subjectGeologyen
dc.subjectstreamwateren
dc.subjectnitrificationen
dc.subjectbiogeochemistryen
dc.subjectgroundwateren
dc.subjectsoil developmenten
dc.subjectpodzolizationen
dc.subjectDISSOLVED ORGANIC-CARBONen
dc.subjectBROOK-EXPERIMENTAL-FORESTen
dc.subjectNORTHERN HARDWOOD FORESTen
dc.subjectNITROGEN DEPOSITIONen
dc.subjectSOIL CARBONen
dc.subjectHYDROLOGICAL CONNECTIVITYen
dc.subjectBIOGEOCHEMICAL PROCESSESen
dc.subjectRUNOFF GENERATIONen
dc.subjectWATER CHEMISTRYen
dc.subjectFLOW CONDITIONSen
dc.titleIdentifying Controls on Nitrate Sources and Flowpaths in a Forested Catchment Using a Hydropedological Frameworken
dc.title.serialJournal of Geophysical Research - Biogeosciencesen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherArticleen
dc.type.otherJournalen
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Natural Resources & Environmenten
pubs.organisational-group/Virginia Tech/Natural Resources & Environment/Forest Resources and Environmental Conservationen
pubs.organisational-group/Virginia Tech/Natural Resources & Environment/Water Resources Research Centeren
pubs.organisational-group/Virginia Tech/University Research Institutesen
pubs.organisational-group/Virginia Tech/University Research Institutes/Fralin Life Sciencesen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Natural Resources & Environment/CNRE T&R Facultyen
pubs.organisational-group/Virginia Tech/University Research Institutes/Fralin Life Sciences/Durelle Scotten
pubs.organisational-group/Virginia Tech/Natural Resources & Environment/Forest Resources and Environmental Conservation/FREC WRRC facultyen

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