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Élaboration d'un dispositif expérimental de manipulations de matière organique sur le long terme en forêt tempérée et évaluation des impacts à très court terme des exportations sur le sol

Abstract : Logging residues represent a non-exploited supply which could be used for energetic purpose, but they are also a relevant compartment for forest soil fertility and biodiversity. Some studies in tropical and boreal context have highlighted the negative impacts of these practices on the forest ecosystems. The MOS network has been set up to evaluate the effects of organic matters manipulations on temperate forest stands at short and long term.This thesis has two objectives: i) to set up the methodology necessary to characterized the ecosystems’ variability and then, to implement the national experimental design of organic matter manipulation by taking into account this variability and ii) to describe the very short terms impacts of organic matter removal on the forest soil cycling. This second aim is organized into two axes: a first part evaluates the impacts of these sylvicultural practices on the biogeochemical cycles and the diversity of fungal communities. A second study scale, in controlled conditions, deals with the understanding of the trophic interactions between trees, ectomycorrhizal fungi and saprotrophic fungi during the wooddecaying process.The absence of clear trend confirms the persistence in the soil functioning at very short term. This first monitoring permitted to identify some functional indicators. A regular monitoring will strengthen these observations by introducing some biological indicators on fungal communities.
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  • HAL Id : tel-02796766, version 1
  • PRODINRA : 340102

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Emila Akroume. Élaboration d'un dispositif expérimental de manipulations de matière organique sur le long terme en forêt tempérée et évaluation des impacts à très court terme des exportations sur le sol. Science des sols. AgroParisTech, 2015. Français. ⟨NNT : 2015AGPT0069⟩. ⟨tel-02796766⟩

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