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Moisture-driven divergence in mineral-associated soil carbon persistence.
Heckman, Katherine A; Possinger, Angela R; Badgley, Brian D; Bowman, Maggie M; Gallo, Adrian C; Hatten, Jeff A; Nave, Lucas E; SanClements, Michael D; Swanston, Christopher W; Weiglein, Tyler L; Wieder, William R; Strahm, Brian D.
Afiliación
  • Heckman KA; USDA Forest Service, Northern Research Station, Houghton, MI 49931.
  • Possinger AR; Department of Forest Resources and Environmental Conservation, Virginia Tech, Blacksburg, VA 24061.
  • Badgley BD; School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA 24061.
  • Bowman MM; Environmental Molecular Sciences Laboratory, Earth and Biological Sciences Division, Richland, WA 99354.
  • Gallo AC; Forest Engineering, Resources & Management, Oregon State University, Corvallis, OR 97330.
  • Hatten JA; Forest Engineering, Resources & Management, Oregon State University, Corvallis, OR 97330.
  • Nave LE; Northern Institute of Applied Climate Science, Michigan Technological University, Houghton, MI 49931.
  • SanClements MD; National Ecological Observatory Network, Battelle, Boulder, CO 80301.
  • Swanston CW; Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80303.
  • Weiglein TL; Office of Sustainability and Climate, United States Department of Agriculture Forest Service, Houghton, MI 49931.
  • Wieder WR; Department of Forest Resources and Environmental Conservation, Virginia Tech, Blacksburg, VA 24061.
  • Strahm BD; Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80303.
Proc Natl Acad Sci U S A ; 120(7): e2210044120, 2023 Feb 14.
Article en En | MEDLINE | ID: mdl-36745807
ABSTRACT
Mineral stabilization of soil organic matter is an important regulator of the global carbon (C) cycle. However, the vulnerability of mineral-stabilized organic matter (OM) to climate change is currently unknown. We examined soil profiles from 34 sites across the conterminous USA to investigate how the abundance and persistence of mineral-associated organic C varied with climate at the continental scale. Using a novel combination of radiocarbon and molecular composition measurements, we show that the relationship between the abundance and persistence of mineral-associated organic matter (MAOM) appears to be driven by moisture availability. In wetter climates where precipitation exceeds evapotranspiration, excess moisture leads to deeper and more prolonged periods of wetness, creating conditions which favor greater root abundance and also allow for greater diffusion and interaction of inputs with MAOM. In these humid soils, mineral-associated soil organic C concentration and persistence are strongly linked, whereas this relationship is absent in drier climates. In arid soils, root abundance is lower, and interaction of inputs with mineral surfaces is limited by shallower and briefer periods of moisture, resulting in a disconnect between concentration and persistence. Data suggest a tipping point in the cycling of mineral-associated C at a climate threshold where precipitation equals evaporation. As climate patterns shift, our findings emphasize that divergence in the mechanisms of OM persistence associated with historical climate legacies need to be considered in process-based models.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies / Risk_factors_studies Idioma: En Revista: Proc Natl Acad Sci U S A Año: 2023 Tipo del documento: Article

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies / Risk_factors_studies Idioma: En Revista: Proc Natl Acad Sci U S A Año: 2023 Tipo del documento: Article
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