Redistribution of soil metals and organic carbon via lateral flowpaths at the catchment scale in a glaciated upland setting

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dc.contributor.authorBourgault, Rebecca R.en
dc.contributor.authorRoss, Donald S.en
dc.contributor.authorBailey, Scott W.en
dc.contributor.authorBullen, Thomas D.en
dc.contributor.authorMcGuire, Kevin J.en
dc.contributor.authorGannon, John P.en
dc.contributor.departmentForest Resources and Environmental Conservationen
dc.contributor.departmentVirginia Water Resources Research Centeren
dc.date.accessioned2020-03-18T12:10:26Zen
dc.date.available2020-03-18T12:10:26Zen
dc.date.issued2017-12-01en
dc.description.abstractEmerging evidence shows that interactions between soils and subsurface flow paths contribute to spatial variations in stream water chemistry in headwater catchments. However, few have yet attempted to quantify chemical variations in soils at catchment and hillslope scales. Watershed 3 (WS3) at Hubbard Brook Experimental Forest, New Hampshire, USA, was studied in order to better understand pedogenesis and its relationship to subsurface water dynamics. In WS3, 99 soil profiles were described, sampled by horizon, and assigned to a hydropedologic unit (HPU), a functional classification previously developed using landscape and morphological metrics which corresponded with distinct water table regimes. Soil samples were extracted with 1) citrate-dithionite (d) and analyzed for Fe-d and Mn-d; and 2) acid ammonium oxalate (o) and analyzed for Al-o, Fe-o and the rare earth elements La-o, Ce-o, and Pr-o. Total organic C was also measured. These elements were redistributed via vertical and lateral podzolization. Typical (horizontally layered) podzols developed in the majority of the catchment due to predominantly vertical, unsaturated flow. However, lateral flow produced four other podzol types with distinct chemistry; thicker spodic horizons of laterally accumulating soils generally reflected larger pools of trace metals and subsoil organic C. The spatial distribution of positive cerium-anomalies (Ce/Ce*) in soil profiles proved to be a consistent hydropedologic indicator of lateral flow and seasonally high water table in three hillslopes. Despite occasional high water table in some of the HPUs, they were not hydric soils and were distinct from wetter podzols of coastal plains due to their high Fe content. This study suggests that vertical and lateral spatial variation in soil chemical composition, including the complexity of Ce distribution, as it relates to subsurface water dynamics should be considered when studying or predicting catchment scale functions such as stream solute export and biogeochemical processes.en
dc.description.adminPublic domain – authored by a U.S. government employeeen
dc.description.notesThe authors wish to thank the following people for assistance in the field and laboratory: Noah Ahles, Andrea Brendalen, Margaret Burns, Silene DeCiucies, Cody Gillin, Ethan Morehouse, Emily Fiche, Geoff Schwaner, and Margaret Zimmer. Thanks also to dissertation committee members Greg Druschel, Josef Gorres, and Jeff Hughes for ideas and insight. Funding was provided by NSF Hydrologic Sciences (EAR 1014507) and LTER (DEB 1114804) programs. Hubbard Brook Experimental Forest is operated and maintained by the US Forest Service, Northern Research Station, Newtown Square, PA.en
dc.description.sponsorshipNSF Hydrologic SciencesNational Science Foundation (NSF)NSF - Directorate for Geosciences (GEO) [EAR 1014507]; LTER [DEB 1114804]en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1016/j.geoderma.2017.05.039en
dc.identifier.eissn1872-6259en
dc.identifier.issn0016-7061en
dc.identifier.orcidMcGuire, Kevin J. [0000-0001-5751-3956]en
dc.identifier.urihttp://hdl.handle.net/10919/97342en
dc.identifier.volume307en
dc.language.isoenen
dc.rightsCreative Commons CC0 1.0 Universal Public Domain Dedicationen
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/en
dc.subjectPodzolsen
dc.subjectHydropedologyen
dc.subjectOrganic carbonen
dc.subjectRare earth elementsen
dc.subjectTrace metalsen
dc.titleRedistribution of soil metals and organic carbon via lateral flowpaths at the catchment scale in a glaciated upland settingen
dc.title.serialGeodermaen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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