Infodoc : Sciences, Techniques et Culture

In a natural environment, major disturbances cause the destruction of the vegetation as well as of soil microorganisms such as mycorrhizal fungi. Plant and mycorrhizal fungus communities are independent and so it is important to understand the dynamics of mycorrhizal communities during the stages in plant colonisation successions that generate a forest canopy. These successions go along with an increase in the wealth of species and the diversity of the mycorrhizal community through the gradual establishment of late-stage fungi and the decrease in the number of multi-stage fungi. Plant-fungus interactions become specialised as the plant succession runs its course or as the population ages. These dynamics of mycorrhizal communities can be explained by differences in the life history tra[...]

In a natural environment, major disturbances cause the destruction of the vegetation as well as of soil microorganisms such as mycorrhizal fungi. Plant and mycorrhizal fungus communities are independent and so it is important to understand the dynamics of mycorrhizal communities during the stages in plant colonisation successions that generate a forest canopy. These successions go along with an increase in the wealth of species and the diversity of the mycorrhizal community through the gradual establishment of late-stage fungi and the decrease in the number of multi-stage fungi. Plant-fungus interactions become specialised as the plant succession runs its course or as the population ages. These dynamics of mycorrhizal communities can be explained by differences in the life history traits between species of fungi, but also by a change in the characteristics of the plant community and the soil over time.
En milieu naturel, les perturbations importantes conduisent à la destruction de la végétation mais aussi des microorganismes du sol comme les champignons mycorhiziens. Les communautés de plantes et de champignons mycorhiziens étant interdépendantes, il est important de comprendre la dynamique des communautés mycorhiziennes au cours des stades des successions de colonisation végétale, qui débouchent sur un couvert forestier. Ces successions s’accompagnent d’une augmentation de la richesse spécifique et de la diversité de la communauté mycorhizienne par l’établissement progressif de champignons de stade tardif et la diminution du nombre de champignons pluristades. Les interactions plantes-champignons se spécialisent au cours de la succession végétale ou du vieillissement d’un peuplement. Cette dynamique des communautés mycorhiziennes s’explique par des différences de traits d’histoire de vie entre les espèces de champignons, mais aussi par une modification des caractéristiques de la communauté végétale et du sol avec le temps.