ECOLAB > Agenda > Biodiversity and Ecosystem Functioning in Boreal Forest

Biodiversity and Ecosystem Functioning in Boreal Forest

Séminaire le 13 mars 2020 à 11h00
Toulouse 4R1 Toulouse 4R1
FANIN Nicolas

ISPA - Interaction Soil Plant Atmosphere, INRAE, Villenave d'Ornon

 

Biodiversity and Ecosystem Functioning in Boreal Forest

Vendredi 13 mars 2020, 11h, Salle de Conférences, 4R1

Nicolas FANIN

ISPA - Interaction Soil Plant Atmosphere, INRAE, Villenave d'Ornon

 

Loss of plant diversity has an impact on ecosystems worldwide, but we lack a mechanistic understanding of how this loss may influence below-ground biota and ecosystem functions across contrasting ecosystems in the long term. During this presentation, I will present recent results of two 20-year plant diversity manipulation experiments, i.e. plant functional group removals (tree, shrub and moss) or species removals (different shrub species), each established across a strong environmental gradient which consists of 30 forested lake islands in northern Sweden. Specifically, I will discuss the effects of plant diversity loss on: (1) interactions among fungal guilds and their impacts on nutrient cycling; (2) changes in bacterial, fungal and nematode communities and their effects on microbial activity and organic matter quality; (3) the contribution of microbial communities to ecosystem multifunctionality; (4) the temporal variability in plant productivity. Overall, our results suggest partial decoupling of the above-ground and below-ground subsystems, where environmental drivers that strongly affect above-ground communities might only strongly affect some components of the soil biota (e.g. those closely linked to plants) and not others (e.g. those closely linked to abiotic soil factors), leading to variable strength of below-ground responses to plant diversity loss. This emphasizes that although the effects of biodiversity loss on above-ground functions such as productivity can be strongly influenced by the environmental context, including on our island chronosequence, the effects of plant diversity loss on the structure and function of soil communities can be relatively similar across contrasting ecosystems, and this irrespective of large differences in ecosystem productivity or fertility. I will finish this presentation by introducing briefly our current projects assessing the effects of tree diversity and/or tree identity on soil functioning and carbon sequestration in France and in Europe.

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