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Variabilité intra-annuelle de l’efficacité de production de biomasse aérienne (aBPE) d’une forêt : comparaison avec une prairie soumise aux mêmes conditions climatiques

Abstract : The study of the carbon (C) cycle is important in terrestrial ecosystems (forest, grassland) in order to understand their behavior, their role in the C cycle and also the impact of climate change on them. The general study of this thesis which is to monitor the intra-annual allocation of C into different terrestrial ecosystem (forest and grassland), lays within this context. Firstly we calculated aboveground biomass production efficiencies (aBPE, ratio between the quantity of C stored into the aboveground biomass and absorbed) intra-annually, weekly or monthly depending on the ecosystem (grassland and forest respectively). Secondly a more precise assessment of the C allocation in forest was made by analyzing the formation of structural C compounds (hemicelluloses and cellulose + lignins). A possible link between the variability of these allocations and climate was studied. The corresponding efficiencies were then calculated monthly in order to have a better idea of the sustainable C storage in this ecosystem. A comparison with a grassland in term of aBPE was then realized in order to analyze the adaptation capacity of each ecosystem to climate change and to play a role in the mitigation of GHG. Two neighboring ecosystems located in Montiers-sur-Saulx and Osne-le-Val were equipped, as part of the Observatoire Pérenne de l’Environnement (OPE), to measure continuously the CO2 exchange between land cover and atmosphere and the micrometeorological conditions in which these exchanges happen. A regular monitoring of those ecosystems development (biomass, leaves area, senescence) was also made
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Submitted on : Tuesday, July 10, 2018 - 3:42:07 PM
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Laura Heid. Variabilité intra-annuelle de l’efficacité de production de biomasse aérienne (aBPE) d’une forêt : comparaison avec une prairie soumise aux mêmes conditions climatiques. Biologie végétale. Université de Lorraine, 2017. Français. ⟨NNT : 2017LORR0318⟩. ⟨tel-01834474⟩

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