Abstract
In temperate and boreal forests, competition for soil resources between free-living saprotrophs and ectomycorrhizal (EcM) fungi has been suggested to restrict saprotrophic fungal dominance to the most superficial organic soil horizons in forests dominated by EcM trees. By contrast, lower niche overlap with arbuscular mycorrhizal (AM) fungi could allow fungal saprotrophs to maintain this dominance into deeper soil horizons in AM-dominated forests. Here we used a natural gradient of adjacent forest patches that were dominated by either AM or EcM trees, or a mixture of both to determine how fungal communities characterized with high-throughput amplicon sequencing change across organic and mineral soil horizons. We found a general shift from saprotrophic to mycorrhizal fungal dominance with increasing soil depth in all forest mycorrhizal types, especially in organic horizons. Vertical changes in soil chemistry, including pH, organic matter, exchangeable cations, and extractable phosphorus, coincided with shifts in fungal community composition. Although fungal communities and soil chemistry differed among adjacent forest mycorrhizal types, variations were stronger within a given soil profile, pointing to the importance of considering horizons when characterizing soil fungal communities. Our results also suggest that in temperate forests, vertical shifts from saprotrophic to mycorrhizal fungi within organic and mineral horizons occur similarly in both ectomycorrhizal and arbuscular mycorrhizal forests.
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Data Availability
Sequence and chemistry data can be accessed at https://doi.org/10.5281/zenodo.3631861.
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Acknowledgments
We are grateful to two anonymous reviewers for the suggestions that improved the manuscript. We would like to thank Dayana Agudo, William Barrette, Aleksandra Bielnicka, Sarah Dupont, Paola Escobar, Caroline Fink-Mercier, Audren Jiquel, and David Poissant for the field and laboratory assistance. We also thank the staff from the Station de biologie des Laurentides (SBL) of Université de Montréal for facilitating the field work. Funding, including scholarships to AC, was provided by Discovery Grants to EL (RGPIN-2014-06106, RGPIN-2019-04537) by the Natural Sciences and Engineering Research Council of Canada (NSERC) as well as a “Nouveau Chercheur” grant (2016-NC-188823) by the Fonds de recherche du Québec sur la Nature et technologies (FRQNT). AC would like to sincerely thank the Institut de recherche en biologie végétale, Centre d’étude de la forêt, Centre de la science de la biodiversité du Québec, Université de Montréal, and the FRQNT for providing generous financial support.
Code Availability
Custom code for bioinformatical and statistical analyses are available at https://doi.org/10.5281/zenodo.3631982.
Funding
This study received financial support from the Discovery Grants (RGPIN-2014-06106, RGPIN-2019-04537) by the Natural Sciences and Engineering Research Council of Canada (NSERC) and “Nouveau Chercheur” grant (2016-NC-188823) by the Fonds de recherche du Québec sur la Nature et technologies (FRQNT).
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EL and AC conceived the ideas and designed methodology; AC, BT, SJ, and MB collected the data; AC analyzed the data; AC and EL interpreted the results; AC led the writing of the manuscript. All authors contributed critically to the drafts and gave final approval for publication.
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Carteron, A., Beigas, M., Joly, S. et al. Temperate Forests Dominated by Arbuscular or Ectomycorrhizal Fungi Are Characterized by Strong Shifts from Saprotrophic to Mycorrhizal Fungi with Increasing Soil Depth. Microb Ecol 82, 377–390 (2021). https://doi.org/10.1007/s00248-020-01540-7
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DOI: https://doi.org/10.1007/s00248-020-01540-7