Root presence modifies the long‐term decomposition dynamics of fungal necromass and the associated microbial communities in a boreal forest

Autor: Jussi Heinonsalo, Bartosz Adamczyk, Peter G. Kennedy, François Maillard, Marc Buée
Přispěvatelé: Interactions Arbres-Microorganismes (IAM), Université de Lorraine (UL)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), University of Minnesota [Twin Cities] (UMN), University of Minnesota System, NATURAL RESOURCES INSTITUTE FINLAND HELSINKI FIN, Partenaires IRSTEA, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Department of Microbiology, University of Helsinki, Helsinki, Finland, Department of Food and Nutrition, Department of Microbiology, Ecosystem processes (INAR Forest Sciences), Forest Soil Science and Biogeochemistry, Jussi Heinonsalo / Principal Investigator, Viikki Plant Science Centre (ViPS)
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Molecular Ecology
Molecular Ecology, Wiley, 2021, 30 (8), pp.1921-1935. ⟨10.1111/mec.15828⟩
ISSN: 0962-1083
1365-294X
DOI: 10.1111/mec.15828⟩
Popis: Recent studies have highlighted that dead fungal mycelium represents an important fraction of soil carbon (C) and nitrogen (N) inputs and stocks. Consequently, identifying the microbial communities and the ecological factors that govern the decomposition of fungal necromass will provide critical insight into how fungal organic matter (OM) affects forest soil C and nutrient cycles. Here, we examined the microbial communities colonising fungal necromass during a multiyear decomposition experiment in a boreal forest, which included incubation bags with different mesh sizes to manipulate both plant root and microbial decomposer group access. Necromass-associated bacterial and fungal communities were taxonomically and functionally rich throughout the 30 months of incubation, with increasing abundances of oligotrophic bacteria and root-associated fungi (i.e., ectomycorrhizal, ericoid mycorrhizal and endophytic fungi) in the late stages of decomposition in the mesh bags to which they had access. Necromass-associated beta-glucosidase activity was highest at 6 months, while leucine aminopeptidase peptidase was highest at 18 months. Based on an asymptotic decomposition model, root presence was associated with an initial faster rate of fungal necromass decomposition, but resulted in higher amounts of fungal necromass retained at later sampling times. Collectively, these results indicate that microbial community composition and enzyme activities on decomposing fungal necromass remain dynamic years after initial input, and that roots and their associated fungal symbionts result in the slowing of microbial necromass turnover with time.
Databáze: OpenAIRE
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