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  • Mycorrhizal effects on decomposition and soil CO2 flux depend on changes in nitrogen availability during forest succession

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    Embargoed until: 2022-08-21
    File version
    Accepted Manuscript (AM)
    Author(s)
    Liu, R
    He, Y
    Zhou, G
    Shao, J
    Zhou, L
    Zhou, H
    Li, N
    Song, B
    Liang, C
    Yan, E
    Chen, X
    Wang, X
    Wang, M
    Bai, SH
    Zhou, X
    Phillips, RP
    Griffith University Author(s)
    Hosseini-Bai, Shahla
    Year published
    2021
    Metadata
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    Abstract
    Mycorrhizal fungi play a central role in plant nutrition and nutrient cycling, yet our understanding on their effects on free-living microbes, soil carbon (C) decomposition and soil CO2 fluxes remains limited. Here we used trenches lined with mesh screens of varying sizes to isolate mycorrhizal hyphal effects on soil C dynamics in subtropical successional forests. We found that the presence of mycorrhizal hyphae suppressed soil CO2 fluxes by 17% in early-successional forests, but enhanced CO2 losses by 20% and 32% in mid- and late-successional forests respectively. The inhibitory effects of mycorrhizal fungi on soil CO2 ...
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    Mycorrhizal fungi play a central role in plant nutrition and nutrient cycling, yet our understanding on their effects on free-living microbes, soil carbon (C) decomposition and soil CO2 fluxes remains limited. Here we used trenches lined with mesh screens of varying sizes to isolate mycorrhizal hyphal effects on soil C dynamics in subtropical successional forests. We found that the presence of mycorrhizal hyphae suppressed soil CO2 fluxes by 17% in early-successional forests, but enhanced CO2 losses by 20% and 32% in mid- and late-successional forests respectively. The inhibitory effects of mycorrhizal fungi on soil CO2 fluxes in the young stands were associated with changes in soil nitrogen (N) mineralization and microbial activities, suggesting that competition between mycorrhizae and saprotrophs for N likely suppressed soil C decomposition. In the mid- and late-successional stands, mycorrhizal enhancement of CO2 release from soil likely resulted from both hyphal respiration and mycorrhizal-induced acceleration of organic matter decay. Synthesis. Our results highlight the sensitivity of mycorrhizal fungi-saprotroph interactions to shifts in nutrient availability and demand, with important consequences for soil carbon dynamics particularly in ecosystems with low nutrient conditions. Incorporating such interactions into models should improve the simulations of forest biogeochemical cycles under global change.
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    Journal Title
    Journal of Ecology
    DOI
    https://doi.org/10.1111/1365-2745.13770
    Copyright Statement
    © 2021 British Ecological Society. This is the pre-peer reviewed version of the following article: Mycorrhizal effects on decomposition and soil CO2 flux depend on changes in nitrogen availability during forest succession, Journal of Ecology, 2021, which has been published in final form at https://doi.org/10.1111/1365-2745.13770. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving (http://olabout.wiley.com/WileyCDA/Section/id-828039.html)
    Note
    This publication has been entered in Griffith Research Online as an advanced online version.
    Subject
    Ecology
    Soil sciences
    Environmental sciences
    Biological sciences
    Agricultural, veterinary and food sciences
    Publication URI
    http://hdl.handle.net/10072/408773
    Collection
    • Journal articles

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