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Master Thesis

Étude de l’impact des changements climatiques et d’utilisation du sol sur l’évolution de la forêt et de sa limite supérieure dans le massif du Mont-­Blanc entre 1952 et 2006

Abstract : Thermal rising and agricultural decrease are well-­known phenomenon affecting plant communities especially in mountainous regions. Thus, it seems pretty important to look upon the effects of global change on alpine ecosystems to be able to ensure the preservation of societies and of the environment. Yet it appears that there is a lack of ecological and biogeographical studies in the Mont-Blanc massif. In this study, we tried to emphasize the respective influence of climate change and landuse modifications on the forest evolution of this emblematic range that is the Mont-Blanc. We also tried to understand the variations of the regional climatic treeline and the factors involved in its evolution. Thanks to the use of remote sensing and Geographical Information Systems, it has been possible to observe the great expansions of the forest cover that took place between 1952 and 2006 on the Swiss, Italian and French sides of the mountain. Indeed, the forest cover has increased by 60% and has rose significantly during the study period, mainly because of land abandonment. However, the influence of climate cannot be ignored, especially as an explaining factor of the major rise of the treeline of about 59m recorded since the middle of the 20th century. Though these results are quiet interesting, they still need further analysis to emphasize the actual rôle of land use, climate or geomorphology on plant dynamics in the Alps.
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https://dumas.ccsd.cnrs.fr/dumas-01112578
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Submitted on : Tuesday, February 3, 2015 - 11:34:28 AM
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  • HAL Id : dumas-01112578, version 1

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François-Marie Martin. Étude de l’impact des changements climatiques et d’utilisation du sol sur l’évolution de la forêt et de sa limite supérieure dans le massif du Mont-­Blanc entre 1952 et 2006. Milieux et Changements globaux. 2014. ⟨dumas-01112578⟩

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