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Modélisation de la dynamique de l'allocation des ressources des plantes face aux incendies : cas des arbres en savane

Abstract : Savannas account for 12% of world land cover. Fire is the main factor disrupting the life cycle of plants. After the fire, the plant allocates its carbonated biomass available in its roots to all its parts for regeneration. Models were built on savannah discharges without formally considering the dynamics of reserve allocation allowing the plant to survive the fire. The purpose of my thesis is to study by modeling the allocation strategies allowing savannah trees to regrow after fire. I have proposed a general model for allocating carbon resources when regenerating trees after the fire has passed. This is a model with a rejection with one or more stems. Strategies that allow plants to survive the fire (grow above the height of the flames) are those where the allocation of biomass to the aerial parts is greater than 60%. The plant's architecture has an influence on these allocation strategies. As far as allocation strategies are concerned, the action of fire appears to be a strengthened dry season, compared to the rainy season. The stem number changes the leaf/stem ratio allocation and allows more leaf biomass to be produced compared to stem biomass. Coupled with a demographic model, these models will allow us to consider the role of the plant biomass allocation strategy in areas subject to fire where anthropogenic pressures and global warming threaten the survival of several species.
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Submitted on : Monday, June 27, 2022 - 1:02:02 AM
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  • HAL Id : tel-03705124, version 1

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Kouadio Jean-Philippe Akpoue. Modélisation de la dynamique de l'allocation des ressources des plantes face aux incendies : cas des arbres en savane. Sciences de la Terre. Sorbonne Université, 2021. Français. ⟨NNT : 2021SORUS240⟩. ⟨tel-03705124⟩

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