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The extent to which soil hydraulics can explain ecohydrological separation

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Listed:
  • Catherine E. Finkenbiner

    (Oregon State University
    Oregon State University)

  • Stephen P. Good

    (Oregon State University
    Oregon State University)

  • J. Renée Brooks

    (Pacific Ecological Systems Division, Center for Public Health and Environmental Assessment, United States Environmental Protection Agency
    Oregon State University)

  • Scott T. Allen

    (University of Nevada)

  • Salini Sasidharan

    (Oregon State University)

Abstract

Field measurements of hydrologic tracers indicate varying magnitudes of geochemical separation between subsurface pore waters. The potential for conventional soil physics alone to explain isotopic differences between preferential flow and tightly-bound water remains unclear. Here, we explore physical drivers of isotopic separations using 650 different model configurations of soil, climate, and mobile/immobile soil-water domain characteristics, without confounding fractionation or plant uptake effects. We find simulations with coarser soils and less precipitation led to reduced separation between pore spaces and drainage. Amplified separations are found with larger immobile domains and, to a lesser extent, higher mobile-immobile transfer rates. Nonetheless, isotopic separations remained small (

Suggested Citation

  • Catherine E. Finkenbiner & Stephen P. Good & J. Renée Brooks & Scott T. Allen & Salini Sasidharan, 2022. "The extent to which soil hydraulics can explain ecohydrological separation," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-34215-7
    DOI: 10.1038/s41467-022-34215-7
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    References listed on IDEAS

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    1. Jaivime Evaristo & Scott Jasechko & Jeffrey J. McDonnell, 2015. "Global separation of plant transpiration from groundwater and streamflow," Nature, Nature, vol. 525(7567), pages 91-94, September.
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