Environmental drivers of ectomycorrhizal communities in Europe's temperate oak forests

Laura M Suz, Nadia Barsoum, Sue Benham, Hans Peter Dietrich, Karl Dieter Fetzer, Richard Fischer, Paloma Garcia, Joachim Gehrman, Ferdinand Kristöfel, Miklos Manninger, Stefan Neagu, Manuel Nicolas, Jan Oldenburger, Stephan Raspe, Gerardo Sanchez, Hans Werner Schröck, Andrea Schubert, Kris Verheyen, Arne Verstraeten, Martin I Bidartondo

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    Abstract

    Ectomycorrhizal fungi are major ecological players in temperate forests, but they are rarely used in measures of forest condition because large-scale, high-resolution, standardized and replicated belowground data are scarce. We carried out an analysis of ectomycorrhizas at 22 intensively monitored long-term oak plots, across nine European countries, covering complex natural and anthropogenic environmental gradients. We found that at large scales, mycorrhizal richness and evenness declined with decreasing soil pH and root density, and with increasing atmospheric nitrogen deposition. Shifts in mycorrhizas with different functional traits were detected; mycorrhizas with structures specialized for long-distance transport related differently to most environmental variables than those without. The dominant oak-specialist Lactarius quietus, with limited soil exploration abilities, responds positively to increasing nitrogen inputs and decreasing pH. In contrast, Tricholoma, Cortinarius and Piloderma species, with medium-distance soil exploration abilities, show a consistently negative response. We also determined nitrogen critical loads for moderate (9.5–13.5 kg N/ha/year) and drastic (17 kg N/ha/year) changes in belowground mycorrhizal root communities in temperate oak forests. Overall, we generated the first baseline data for ectomycorrhizal fungi in the oak forests sampled, identified nitrogen pollution as one of their major drivers at large scales and revealed fungi that individually and/or in combination with others can be used as belowground indicators of environmental characteristics.
    Original languageEnglish
    JournalMolecular Ecology
    Volume23 (22)
    Pages (from-to)5628-5644
    Number of pages17
    ISSN0962-1083
    Publication statusPublished - 26-Sep-2014

    Thematic list

    • Eutrophication
    • Acidification
    • Flora
    • Oak- and beechwoods

    EWI Biomedical sciences

    • B003-ecology

    Taxonomic list

    • fungi (Fungi)

    Policy

    • woodland protection
    • soil protection
    • air pollution emission policy

    Geographic list

    • Europe

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