Forest catchment structure mediates shallow subsurface flow and soil base cation fluxes

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dc.contributor.authorPennino, Amandaen
dc.contributor.authorStrahm, Brian D.en
dc.contributor.authorMcGuire, Kevin J.en
dc.contributor.authorBower, Jennifer A.en
dc.contributor.authorBailey, Scott W.en
dc.contributor.authorSchreiber, Madeline E.en
dc.contributor.authorRoss, Donald S.en
dc.contributor.authorDuston, Stephanie A.en
dc.contributor.authorBenton, Joshua R.en
dc.date.accessioned2024-10-23T18:28:36Zen
dc.date.available2024-10-23T18:28:36Zen
dc.date.issued2024-10en
dc.description.abstractHydrologic behavior and soil properties across forested landscapes with complex topography exhibit high variability. The interaction of groundwater with spatially distinct soils produces and transports solutes across catchments, however, the spatiotemporal relationships between groundwater dynamics and soil solute fluxes are difficult to directly evaluate. While whole-catchment export of solutes by shallow subsurface flow represents an integration of soil environments and conditions but many studies compartmentalize soil solute fluxes as hillslope vs. riparian, deep vs. shallow, or as individual soil horizon contributions. This potentially obscures and underestimates the hillslope variation and magnitude of solute fluxes and soil development across the landscape. This study determined the spatial variation and of shallow soil base cation fluxes associated with weathering reactions (Ca, Mg, and Na), soil elemental depletion, and soil saturation dynamics in upland soils within a small, forested watershed at the Hubbard Brook Experimental Forest, NH. Base cation fluxes were calculated using a combination of ion-exchange resins placed in shallow groundwater wells (0.3 – 1 m depth) located across hillslope transects (ridges to lower backslopes) and measurements of groundwater levels. Groundwater levels were also used to create metrics of annual soil saturation. Base cation fluxes were positively correlated with soil saturation frequency and were greatest in soil profiles where primary minerals were most depleted of base cations (i.e., highly weathered). Spatial differences in soil saturation across the catchment were strongly related to topographic properties of the upslope drainage area and are interpreted to result from spatial variations in transient groundwater dynamics. Results from this work suggest that the structure of a catchment defines the spatial architecture of base cation fluxes, likely reflecting the mediation of subsurface stormflow dynamics on soil development. Furthermore, this work highlights the importance of further compartmentalizing solute fluxes along hillslopes, where certain areas may disproportionately contribute solutes to the whole catchment. Refining catchment controls on base cation generation and transport could be an important tool for opening the black box of catchment elemental cycling.en
dc.description.notesSource info: GEODER-D-24-00425en
dc.description.versionPublished versionen
dc.format.extent15 page(s)en
dc.format.mimetypeapplication/pdfen
dc.identifierARTN 117045 (Article number)en
dc.identifier.doihttps://doi.org/10.1016/j.geoderma.2024.117045en
dc.identifier.eissn1872-6259en
dc.identifier.issn0016-7061en
dc.identifier.orcidSchreiber, Madeline [0000-0002-1858-7730]en
dc.identifier.orcidStrahm, Brian [0000-0002-4025-2304]en
dc.identifier.urihttps://hdl.handle.net/10919/121377en
dc.identifier.volume450en
dc.language.isoenen
dc.publisherElsevieren
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectForest soilsen
dc.subjectNutrientsen
dc.subjectMineral weatheringen
dc.subjectGroundwateren
dc.subjectHubbard Brooken
dc.subjectCritical Zone Scienceen
dc.titleForest catchment structure mediates shallow subsurface flow and soil base cation fluxesen
dc.title.serialGeodermaen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherArticleen
dc.type.otherJournalen
pubs.organisational-groupVirginia Techen
pubs.organisational-groupVirginia Tech/Natural Resources & Environmenten
pubs.organisational-groupVirginia Tech/Natural Resources & Environment/Forest Resources and Environmental Conservationen
pubs.organisational-groupVirginia Tech/Natural Resources & Environment/Water Resources Research Centeren
pubs.organisational-groupVirginia Tech/Scienceen
pubs.organisational-groupVirginia Tech/Science/Geosciencesen
pubs.organisational-groupVirginia Tech/All T&R Facultyen
pubs.organisational-groupVirginia Tech/Natural Resources & Environment/CNRE T&R Facultyen
pubs.organisational-groupVirginia Tech/Science/COS T&R Facultyen
pubs.organisational-groupVirginia Tech/Natural Resources & Environment/Forest Resources and Environmental Conservation/FREC WRRC facultyen

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