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Dominant control of temperature on (sub-)tropical soil carbon turnover

Author

Listed:
  • Vera D. Meyer

    (University of Bremen)

  • Peter Köhler

    (Alfred-Wegener-Institut Helmholtz Zentrum für Polar- und Meeresforschung)

  • Nadine T. Smit

    (University of Bremen
    Bruker Daltonics GmbH & Co. KG.)

  • Julius S. Lipp

    (University of Bremen)

  • Bingbing Wei

    (Alfred-Wegener-Institut Helmholtz Zentrum für Polar- und Meeresforschung)

  • Gesine Mollenhauer

    (University of Bremen
    Alfred-Wegener-Institut Helmholtz Zentrum für Polar- und Meeresforschung
    University of Bremen)

  • Enno Schefuß

    (University of Bremen)

Abstract

Carbon storage in soils is important in regulating atmospheric carbon dioxide (CO2). However, the sensitivity of the soil-carbon turnover time (τsoil) to temperature and hydrology forcing is not fully understood. Here, we use radiocarbon dating of plant-derived lipids in conjunction with reconstructions of temperature and rainfall from an eastern Mediterranean sediment core receiving terrigenous material from the Nile River watershed to investigate τsoilin subtropical and tropical areas during the last 18,000 years. We find that τsoil was reduced by an order of magnitude over the last deglaciation and that temperature was the major driver of these changes while the impact of hydroclimate was relatively small. We conclude that increased CO2 efflux from soils into the atmosphere constituted a positive feedback to global warming. However, simulated glacial-to-interglacial changes in a dynamic global vegetation model underestimate our data-based reconstructions of soil-carbon turnover times suggesting that this climate feedback is underestimated.

Suggested Citation

  • Vera D. Meyer & Peter Köhler & Nadine T. Smit & Julius S. Lipp & Bingbing Wei & Gesine Mollenhauer & Enno Schefuß, 2025. "Dominant control of temperature on (sub-)tropical soil carbon turnover," Nature Communications, Nature, vol. 16(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-59013-9
    DOI: 10.1038/s41467-025-59013-9
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    References listed on IDEAS

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