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Substrate availability and not thermal acclimation controls microbial temperature sensitivity response to long-term

Luiz A Domeignoz-Horta1,2, Grace Pold3, Hailey Erb1

  • 1Department of Microbiology, University of Massachusetts, Amherst, Massachusetts, USA.

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Summary
This summary is machine-generated.

Soil microbes regulate carbon cycling. Long-term warming impacts microbial physiology indirectly by reducing carbon availability, not solely through thermal acclimation. This finding is crucial for climate change models.

Keywords:
carbon use efficiencyclimate changemicrobial temperature sensitivitymicrobial thermal acclimationsoil carbon cycling

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Area of Science:

  • Soil science
  • Microbial ecology
  • Climate change research

Background:

  • Soil microbes are key to carbon cycling, influencing soil carbon stocks.
  • Climate change predictions depend on understanding microbial responses to warming.
  • Two proposed mechanisms for warming effects: thermal acclimation and substrate availability.

Purpose of the Study:

  • To disentangle the roles of microbial thermal acclimation and substrate availability in response to long-term soil warming.
  • To investigate how warming affects microbial physiology (growth, respiration, carbon use efficiency, enzyme activity).
  • To link microbial physiological responses to soil organic matter quantity and quality.

Main Methods:

  • Soil sampling from long-term (13- and 28-year) experimental warming sites across seasons.
  • Short-term laboratory incubations across a temperature gradient.
  • Measurement of microbial physiological traits and soil organic matter composition.

Main Results:

  • Apparent thermal acclimation of microbial respiration was observed only in summer, linked to reduced dissolved organic matter pools under warming.
  • Higher quantity and quality of soil carbon enhanced the extracellular enzyme pool and its temperature sensitivity, irrespective of warming.
  • Long-term warming indirectly impacted microbial physiology by decreasing carbon availability.

Conclusions:

  • Seasonal litter input may counteract apparent thermal acclimation of carbon cycling to decadal warming.
  • Reduced carbon availability is a significant indirect effect of long-term warming on soil microbial physiology.
  • Earth system models should incorporate these negative feedbacks for accurate long-term warming effect predictions.