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Global warming accelerates soil heterotrophic respiration

Author

Listed:
  • Alon Nissan

    (ETH Zürich)

  • Uria Alcolombri

    (ETH Zürich)

  • Nadav Peleg

    (University of Lausanne)

  • Nir Galili

    (ETH Zürich)

  • Joaquin Jimenez-Martinez

    (ETH Zürich
    Swiss Federal Institute of Aquatic Science and Technology, EAWAG)

  • Peter Molnar

    (ETH Zürich)

  • Markus Holzner

    (Swiss Federal Institute of Aquatic Science and Technology, EAWAG
    Swiss Federal Institute for Forest Snow and Landscape Research, WSL)

Abstract

Carbon efflux from soils is the largest terrestrial carbon source to the atmosphere, yet it is still one of the most uncertain fluxes in the Earth’s carbon budget. A dominant component of this flux is heterotrophic respiration, influenced by several environmental factors, most notably soil temperature and moisture. Here, we develop a mechanistic model from micro to global scale to explore how changes in soil water content and temperature affect soil heterotrophic respiration. Simulations, laboratory measurements, and field observations validate the new approach. Estimates from the model show that heterotrophic respiration has been increasing since the 1980s at a rate of about 2% per decade globally. Using future projections of surface temperature and soil moisture, the model predicts a global increase of about 40% in heterotrophic respiration by the end of the century under the worst-case emission scenario, where the Arctic region is expected to experience a more than two-fold increase, driven primarily by declining soil moisture rather than temperature increase.

Suggested Citation

  • Alon Nissan & Uria Alcolombri & Nadav Peleg & Nir Galili & Joaquin Jimenez-Martinez & Peter Molnar & Markus Holzner, 2023. "Global warming accelerates soil heterotrophic respiration," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38981-w
    DOI: 10.1038/s41467-023-38981-w
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    References listed on IDEAS

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