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Microfungal variations relative to post-fire changes in soil environment.

C J Lucarotti1, C T Kelsey1, A N D Auclair1

  • 1Biology Department, McGill University, 1205 McGregor Avenue, H3A 1B1, Montreal, Quebec, Canada.

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|March 18, 2017
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Summary

Soil microfungi in Picea mariana-Cladina stellaris woodlands are dominated by Mortierella, Mucor, Penicillium, and Trichoderma. Their occurrence is mainly shaped by organic layer development and fire disturbance over time.

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Area of Science:

  • Ecology
  • Soil Science
  • Mycology

Background:

  • Forest ecosystems are shaped by disturbances like fire.
  • Soil microbial communities play a crucial role in ecosystem function.
  • Picea mariana-Cladina stellaris woodlands are common in boreal regions.

Purpose of the Study:

  • To investigate the diversity and distribution of soil microfungi in Picea mariana-Cladina stellaris woodlands at different successional stages after fire.
  • To identify key environmental factors influencing soil microfungal communities.

Main Methods:

  • Soil samples were collected from three Picea mariana-Cladina stellaris woodland sites with different post-fire ages (2, 104, and 137 years).
  • Sampling was conducted at 3 cm intervals to a depth of 9 cm.
  • Microfungi were isolated and identified.
  • Direct and indirect gradient analyses were performed using microfungal species data and 14 soil environmental factors.

Main Results:

  • The most frequently isolated microfungal genera were Mortierella, Mucor, Penicillium, and Trichoderma.
  • Microfungal species composition showed remarkable stability across the successional gradient.
  • Environmental factors related to organic layer accumulation and fire destruction significantly influenced microfungal occurrence.

Conclusions:

  • Soil microfungal communities in these woodlands exhibit resilience to successional changes post-fire.
  • The soil organic layer dynamics and fire history are primary drivers of microfungal community structure and distribution.