Recyclage du manganèse dans les écosystèmes forestiers européens : influence de l’essence forestière sur les flux de manganèse par les pluviolessivats et les chutes de feuilles
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- The concentration of manganese (Mn) in litter promotes decomposition of litter, and consequently the loss of carbon (C) contained in soil organic matter in the form of CO2, thus influencing the climate. In order to evaluate the evolution of potential C storage in European forest soils during a change of tree species, it is necessary to identify whether tree species control Mn recycling. The objective is therefore to evaluate the specific influence of forest species mainly found in Europe (F. sylvatica, Q. petraea, Q. robur, A. alba, P. abies, P. sylvestris) on Mn recycling while considering environmental variables such as climate and soil. To this end, the ICP Forests database, studying the ecological and geochemical functioning of European forests, is used to quantify the fluxes of Mn by litterfall and by throughfall. The recycling of Mn by these two fluxes shows differences between species. Mn recycling by litterfall is four times higher than recycling by throughfall for conifers, and rises to ten times for hardwoods, indicating a dominance of species importance. The two Mn fluxes are nevertheless relatively correlated indicating that Mn recycling by these two fluxes is favored by similar conditions (i.e. oceanic and continental climates). Within each species, the determined fluxes show some variability due to the heterogeneity of environmental variables (e.g. climate). The model shows two common influencing factors for both Mn fluxes: climate and species, which are therefore extensively involved in Mn recycling. Since Mn recycling varies within vegetation, it is likely that species that recycle less, such as conifers, are more conducive to soil C storage.