skip to main content
Idioma:
Primo Search
Clear Search Box
Search in: Busca Geral
Busca Avançada
Busca por Índices

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

Morales, Savannah R. ; Lemon, Mary Grace T. ; Stewart, Ryan D. ; Keim, Richard F.

Water resources research, 2021-07, Vol.57 (7), p.n/a [Periódico revisado por pares]

Washington: John Wiley & Sons, Inc

Texto completo disponível

Citações Citado por
  • Título:
    Flood‐Induced Recharge of Matrix Water in a Vertic Forest Soil
  • Autor: Morales, Savannah R. ; Lemon, Mary Grace T. ; Stewart, Ryan D. ; Keim, Richard F.
  • Assuntos: bypass flow ; Chemical composition ; Clay ; Clay soils ; Composition ; Cracks ; Depth ; Deuteration ; Deuterium ; Dyes ; Flood control ; Flood frequency ; Flooding ; floodplain ; Floodplains ; Floods ; Floodwater ; Forest soils ; Frequency analysis ; Gravimetry ; Hydraulic properties ; imbibition ; Induced infiltration ; Isotope composition ; macropore ; micropore ; Moisture content ; Organic matter ; Porosity ; Recharge ; River discharge ; Soil ; Soil moisture ; Soil moisture content ; Soil organic matter ; Soil porosity ; Soil properties ; Soil shrinkage ; Soil swelling ; Soil water ; Soil water composition ; Soil water movement ; Soils ; Staining ; Swell ; Tracers ; Vertisols ; Water content ; Water depth ; Water flow ; wetland
  • É parte de: Water resources research, 2021-07, Vol.57 (7), p.n/a
  • Descrição: Vertisols 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. Plain Language Summary Shrink‐swell clay soils are common in floodplains but their behavior during flooding, particularly how much flood water they take up, is not well understood. We flooded large blocks of shrink‐swell soil with artificial floodwater spiked with dye and chemically labeled water, and found that water moved rapidly into soils via cracks and large soil pores, but swelling closed those pathways and prevented floodwater from spreading throughout the soil blocks. Only near the surface, where there is more organic matter, did floodwaters completely dominate soil moisture after flooding. Results indicate that flow into cracks in shrink‐swell soil is important early in a flood, but not enough water flows this way to allow floodwater to reach throughout the soil before the clays swell and close those pathways. Because the amount of water that the soil can take up is limited in each event, the importance of flooding for soil moisture in shrink‐swell clay soils in floodplains depends on how often flooding occurs rather than how long it persists. Key Points Infiltration of floodwater via macropores ceased with swelling, but isotopic composition was heterogeneous even after 31 days of inundation Slow diffusion dominates isotopic evolution of soil matrix water in Vertisols as porosity decreases The importance of flooding as a source of matrix recharge in vertic floodplain soils may depend more on flood frequency than duration
  • Editor: Washington: John Wiley & Sons, Inc
  • Idioma: Inglês
Voltar para lista de resultados

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.