The extent to which soil hydraulics can explain ecohydrological separation

Catherine E. Finkenbiner, Stephen P. Good (), J. Renée Brooks, Scott T. Allen and Salini Sasidharan
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Catherine E. Finkenbiner: Oregon State University
Stephen P. Good: Oregon State University
J. Renée Brooks: Pacific Ecological Systems Division, Center for Public Health and Environmental Assessment, United States Environmental Protection Agency
Scott T. Allen: University of Nevada
Salini Sasidharan: Oregon State University

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: 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 (

Date: 2022
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DOI: 10.1038/s41467-022-34215-7

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