"Nightlife au mont Pinacle" d'Éliane Excoffier

Limited impact of soil inocula from arbuscular and ectomycorrhizal-dominated sites on root morphology and growth of four tree seedling species from a temperate deciduous forest

Limited impact of soil inocula from arbuscular and ectomycorrhizal-dominated sites on root morphology and growth of four tree seedling species from a temperate deciduous forest

Vlad Parasquive, Jacques Brisson, Etienne Laliberté, Pierre-Luc Chagnon - Plant Soil - 29 October 2024

We inoculated seedlings of ectomycorrhizal (ECM) and arbuscular mycorrhizal (AM) tree species with soils from ECM-dominated forests or AM-dominated open fields ... However, only Acer grew better and invested less in autonomous root-based foraging, when inoculated with AM-dominated soils ... Both AM species (Acer rubrum L. and Ulmus americana L.) had higher AM colonization rates when inoculated with AM-dominated open field soils. However, only Acer grew better and invested less in autonomous root-based foraging, when inoculated with AM-dominated soils. Responses of ECM species to soil inocula were more nuanced. Both species remained unresponsive to inoculation treatment. Populus tremuloides Michx. ECM colonization was higher when inoculated with ECM-dominated soils, while neither root morphology nor mycorrhizal colonization responded to inoculum origin for Quercus rubra L.

Links/Liens: ResearchGate, Springer-Verlag

Mycorrhizal dominance reduces local tree species diversity

Mycorrhizal dominance reduces local tree species diversity across US forests

Alexis Carteron, Mark Vellend & Etienne Laliberté - Nature Ecology & Evolution - 24 February 2022

... we analyse approximately 82,000 forest plots across the USA to show that both ectomycorrhizal-dominated and arbuscular mycorrhizal-dominated forests show relatively low tree diversity, while forests with a mixture of mycorrhizal strategies support a higher number of tree species. Our findings suggest that mycorrhizal dominance, rather than mycorrhizal type, shapes tree diversity in forests.

Link: Preprint

Mycorrhizal associations modify tree diversity−productivity relationships across experimental tree plantations

Shan Luo et al  - New Phytologist - 10 June 2024

... we tested tree species richness–community productivity relationships and the role of arbuscular (AM) or ectomycorrhizal (ECM) fungal-associated tree species in these relationships. Tree species richness had a positive effect on community productivity across experiments, modified by the diversity of tree mycorrhizal associations. In communities with both AM and ECM trees, species richness showed positive effects on community productivity, which could have resulted from complementarity between AM and ECM trees. Moreover, both AM and ECM trees were more productive in mixed communities with both AM and ECM trees than in communities assembled by their own mycorrhizal type of trees.