Variabialité spatio-temporelle des émissions de GES dans une tourbière à Sphaignes : effets sur le bilan carbone

Abstract : Peatlands cover only 2 to 3% of the land area but store between 10 and 25% of the soil carbon. The outcome of the anthropic and climatic pressure on these ecosystems is uncertain regarding their functions and storage. A better understanding of these ecosystems is needed to determine the factors and their interactions on greenhouse gas (GHG) emission. This work consist in monitoring GHG emissions and controlling factors in a Sphagnum peatland to estimate its carbon balance. Experimentation on mesocosms were carried out to explore the effect of hydrology on the fluxes and a monitoring on 4 sites was made to study the daily variability. Results show that La Guette peatland was a carbon source (-220 ± 33 gC m-2 an-1) in spite of the high water table level. The importance of the spatial variability measured in the site was also demonstrate. The hydrology effect was confirmed by the mesocosms experiments and high water table level shows that gas transport might have an effect. Finally the study of the daily variability show that the temperature sensitivity of the respiration might be different between day and night and that synchronizing soil temperatures and respiration can improve the respiration representation.
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Benoît d'Angelo. Variabialité spatio-temporelle des émissions de GES dans une tourbière à Sphaignes : effets sur le bilan carbone. Sciences de la Terre. Université d'Orléans, 2015. Français. ⟨NNT : 2015ORLE2058⟩. ⟨tel-01304452⟩

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