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Geothermally warmed soils reveal persistent increases in the respiratory costs of soil microbes contributing to substantial C losses

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Abstract

Increasing temperatures can accelerate soil organic matter decomposition and release large amounts of CO2 to the atmosphere, potentially inducing positive warming feedbacks. Alterations to the temperature sensitivity and physiological functioning of soil microorganisms may play a key role in these carbon (C) losses. Geothermally active areas in Iceland provide stable and continuous soil temperature gradients to test this hypothesis, encompassing the full range of warming scenarios projected by the Intergovernmental Panel on Climate Change for the northern region. We took soils from these geothermal sites 7 years after the onset of warming and incubated them at varying temperatures and substrate availability conditions to detect persistent alterations of microbial physiology to long-term warming. Seven years of continuous warming ranging from 1.8 to 15.9 °C triggered a 8.6–58.0% decrease on the C concentrations in the topsoil (0–10 cm) of these sub-arctic silt-loam Andosols. The sensitivity of microbial respiration to temperature (Q10) was not altered. However, soil microbes showed a persistent increase in their microbial metabolic quotients (microbial respiration per unit of microbial biomass) and a subsequent diminished C retention in biomass. After an initial depletion of labile soil C upon soil warming, increasing energy costs of metabolic maintenance and resource acquisition led to a weaker capacity of C stabilization in the microbial biomass of warmer soils. This mechanism contributes to our understanding of the acclimated response of soil respiration to in situ soil warming at the ecosystem level, despite a lack of acclimation at the physiological level. Persistent increases in the respiratory costs of soil microbes in response to warming constitute a fundamental process that should be incorporated into climate change-C cycling models.

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Acknowledgements

This research was supported by the European Union’s Seventh Framework Program, the Ministry of Economy, Innovation, Science and Employment of the Junta de Andalucía (postdoctoral fellowship of the Andalucía Talent Hub Program, Marie Skłodowska-Curie actions, COFUND—Grant Agreement No 291780, to SMJ), the European Research Council Synergy grant 610028 (IMBALANCE-P), the research project “GEISpain” (CGL2014-52838-C2-1-R) of the Spanish Ministry of Economy and Competitiveness and the Research Council of the University of Antwerp (FORHOT TOP-BOF project). This work contributes to the FSC-Sink, CAR-ES and ClimMani COST Action (ES1308). The Agricultural University of Iceland and Mogilsá—the Icelandic Forest Research, provided logistical support for the present study. We thank Matthias Meys, Sara Diels, Johan De Gruyter, Giovanni Dalmasso, Fabiana Quirós and Nadine Calluy for their invaluable help in the laboratory and Sara Vicca and James Weedon for their constructive suggestions. We further thank Anne Cools and Tom Van Der Spiet for their assistance with the lab chemical analyses.

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Authors and Affiliations

  1. Atmospheric Physics Group (GFAT), Department of Applied Physics, Faculty of Sciences, University of Granada, 18071, Granada, Spain

    S. Marañón-Jiménez

  2. Centre of Excellence PLECO (Plant and Vegetation Ecology), Department of Biology, University of Antwerpen, Campus Drie Eiken, Universiteitsplein 1, C. 203, 2610, Wilrijk, Belgium

    S. Marañón-Jiménez, J. L. Soong, N. I. W. Leblans & I. A. Janssens

  3. Agricultural University of Iceland, Hvanneyri 311, Borgarnes, Iceland

    B. D. Sigurdsson

  4. CREAF, Cerdanyola del Vallès, 08193, Barcelona, Catalonia, Spain

    J. Peñuelas & D. Asensio

  5. CSIC, Global Ecology Unit CREAF-CSIC-UAB, Bellaterra, 08193, Barcelona, Catalonia, Spain

    J. Peñuelas

  6. Department of Microbiology and Ecosystem Science, University of Vienna, Althanstraße 14, 1090, Vienna, Austria

    A. Richter

  7. StatUa Center for Statistics, University of Antwerp, Antwerp, Belgium

    E. Fransen

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  1. S. Marañón-Jiménez
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Marañón-Jiménez, S., Soong, J.L., Leblans, N.I.W. et al. Geothermally warmed soils reveal persistent increases in the respiratory costs of soil microbes contributing to substantial C losses. Biogeochemistry 138, 245–260 (2018). https://doi.org/10.1007/s10533-018-0443-0

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