Flood-Induced Recharge of Matrix Water in a Vertic Forest Soil

dc.contributor.authorMorales, Savannah R.en
dc.contributor.authorLemon, Mary Grace T.en
dc.contributor.authorStewart, Ryan D.en
dc.contributor.authorKeim, Richard F.en
dc.date.accessioned2022-09-22T17:20:05Zen
dc.date.available2022-09-22T17:20:05Zen
dc.date.issued2021-07en
dc.description.abstractVertisols shrink and swell with changes in soil moisture, influencing hydraulic properties. Vertisols are often in floodplains, yet the importance of flooding as a source of soil moisture remains poorly understood. We used blue dye and deuterated water as tracers to determine the role of the macropore network in matrix recharge under artificial flood durations of 3 and 31 days in large soil monoliths extracted from a forested soil. Gravimetric soil moisture content increased by 47% in the first three days, then increased only 3.5% from day 3-31. Post-flood moisture content was greatest in the organic-rich, top 10 cm and was lower at 10-75 cm where organic matter was less. Deuterium concentration revealed that soil moisture in the top 10 cm was quickly dominated by artificial flood water, but at depth remained <80% floodwater even after 31 days. Pervasive dye staining of ped surfaces in the top 4 cm indicated connectivity to flood waters but staining at depth was less and highly variable. The isotopic composition of soil water at depth continued to shift toward flood water despite no differences in dye staining between days 3 and 31. Results indicate flooding initially but incompletely recharges matrix water via macropores and suggest the importance of flooding as a source of matrix recharge in vertic floodplain soils may depend more on flood frequency than duration. Isotopic composition of matrix water in vertic soils depends on both advective and diffusional processes, with diffusion becoming more dominant as porosity decreases.en
dc.description.adminPublic domain – authored by a U.S. government employeeen
dc.description.notesUnited States Department of Agriculture (USDA) National Institute of Food and Agriculture(United States Department of Agriculture (USDA)); Virginia Agricultural Experiment Station; Hatch Program of the National Institute of Food and Agriculture, USDAen
dc.description.sponsorshipUnited States Department of Agriculture (USDA) National Institute of Food and Agriculture [LAB94374]; Virginia Agricultural Experiment Station; Hatch Program of the National Institute of Food and Agriculture, USDA [1007839]en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1029/2021WR029675en
dc.identifier.eissn1944-7973en
dc.identifier.issn0043-1397en
dc.identifier.issue7en
dc.identifier.urihttp://hdl.handle.net/10919/111967en
dc.identifier.volume57en
dc.language.isoenen
dc.publisherAmerican Geophysical Unionen
dc.rightsPublic Domain (U.S.)en
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/en
dc.subjectclayen
dc.subjectfloodplainen
dc.subjectbypass flowen
dc.subjectmacroporeen
dc.subjectmicroporeen
dc.subjectimbibitionen
dc.subjectwetlanden
dc.subjectsoil wateren
dc.subjectsoil moistureen
dc.titleFlood-Induced Recharge of Matrix Water in a Vertic Forest Soilen
dc.title.serialWater Resources Researchen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

Files

Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
MoralesFlood.pdf
Size:
2.89 MB
Format:
Adobe Portable Document Format
Description:
Published version