Warming drives a ‘hummockification’ of microbial communities associated with decomposing mycorrhizal fungal necromass in peatlands

Francois L Maillard, Christopher W Fernandez, Sunil Mundra, Katherine A. Heckman, Randy Kolka, Håvard Kauserud, Peter G. Kennedy

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Dead fungal mycelium (necromass) represents a critical component of soil carbon (C) and nutrient cycles. Assessing how the microbial communities associated with decomposing fungal necromass change as global temperatures rise will help in determining how these belowground organic matter inputs contribute to ecosystem responses. In this study, we characterized the structure of bacterial and fungal communities associated with multiple types of decaying mycorrhizal fungal necromass incubated within mesh bags across a 9°C whole ecosystem temperature enhancement in a boreal peatland. We found major taxonomic and functional shifts in the microbial communities present on decaying mycorrhizal fungal necromass in response to warming. These changes were most pronounced in hollow microsites, which showed convergence towards the necromass-associated microbial communities present in unwarmed hummocks. We also observed a high colonization of ericoid mycorrhizal fungal necromass by fungi from the same genera as the necromass. These results indicate that microbial communities associated with mycorrhizal fungal necromass decomposition are likely to change significantly with future climate warming, which may have strong impacts on soil biogeochemical cycles in peatlands. Additionally, the high enrichment of congeneric fungal decomposers on ericoid mycorrhizal necromass may help to explain the increase in ericoid shrub dominance in warming peatlands.

Original languageEnglish (US)
Pages (from-to)2032-2043
Number of pages12
JournalNew Phytologist
Volume234
Issue number6
DOIs
StatePublished - Jun 2022

Bibliographical note

Funding Information:
We would like to thank B. Lindahl and two anonymous reviewers for their helpful comments and suggestions on previous versions of this manuscript. Research was supported in part by a grant to PGK and HK from the Norwegian Centennial Chairs Program and the National Science Foundation (2038293 to PGK). The SPRUCE project is generously supported by U.S. Department of Energy, Office of Science, Biological and Environmental Research Program. The authors declare there are no conflict of interests.

Funding Information:
We would like to thank B. Lindahl and two anonymous reviewers for their helpful comments and suggestions on previous versions of this manuscript. Research was supported in part by a grant to PGK and HK from the Norwegian Centennial Chairs Program and the National Science Foundation (2038293 to PGK). The SPRUCE project is generously supported by U.S. Department of Energy, Office of Science, Biological and Environmental Research Program. The authors declare there are no conflict of interests.

Publisher Copyright:
© 2021 The Authors. New Phytologist © 2021 New Phytologist Foundation.

Keywords

  • SPRUCE
  • bog microtopography
  • climate change
  • decomposition
  • mycorrhizal residues
  • necromass congeneric colonization advantage

PubMed: MeSH publication types

  • Journal Article
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, Non-U.S. Gov't

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