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Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity
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High intensity perturbations induce an abrupt shift in soil microbial state.

Irene Cordero1,2, Ainara Leizeaga3,4, Lettice C Hicks4

  • 1Department of Earth and Environmental Sciences, The University of Manchester, Michael Smith Building, Oxford Road, Manchester, M13 9PT, UK. irene.cordero@wsl.ch.

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Summary

Intense drought pulses can cause abrupt, lasting shifts in soil microbial communities, reducing their complexity and function. These changes persist even after drought ends, impacting soil health and microbial resilience.

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Area of Science:

  • Soil microbiology
  • Ecosystem ecology
  • Climate change impacts

Background:

  • Soil microbial communities are crucial for ecosystem functioning.
  • Human-induced environmental changes, especially extreme weather events like droughts, are altering these communities.
  • The existence of a threshold for drought intensity and frequency triggering persistent microbial community shifts remains unexplored.

Purpose of the Study:

  • To investigate if intense drought pulses can induce abrupt and persistent transitions in soil microbial communities.
  • To determine the impact of severe drought on the taxonomic and functional characteristics of soil microbial communities.
  • To assess the legacy effects of drought on soil microbial community structure and function.

Main Methods:

  • Experimental manipulation of soil moisture to simulate intense drought pulses (<15% WHC).
  • Analysis of bacterial and fungal community structure using molecular techniques.
  • Assessment of microbial community functionality and legacy effects post-drought.

Main Results:

  • Intense drought pulses induced significant shifts in bacterial and fungal community structures, leading to reduced complexity and functionality.
  • These community shifts and functional changes persisted after soil moisture was restored.
  • Drought exhibited a strong legacy effect, enhancing bacterial growth rates in subsequent drought events.

Conclusions:

  • High-intensity drought pulses can trigger abrupt and persistent transitions in soil microbial communities, similar to those observed in plant communities.
  • These drought-induced shifts have potentially deleterious consequences for overall soil health.
  • Soil microbial communities demonstrate resilience but also altered functional responses following severe perturbation events.