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Géodynamique, colonisation végétale et phytodiversité des talus d'éboulis dans le massif de la Grande Chartreuse (Préalpes françaises du Nord). Caractéristiques géo-écologiques et sensibilité aux changements environnementaux.

Abstract : Due to their rich ecosystems and great plant diversity, the talus slopes of the Grande Chartreuse massif have been designated by the European Directive on Habitats, Fauna and Flora, as sites of community interest. The plant diversity on these talus slopes seems to be a function of the mosaic landscape structure, whose complex dynamics are determined by the interaction of topo-climatic, edaphic, geomorphologic, geodynamic and biological factors, that act at several spatio-temporal scales. The plants colonization noted on some talus slopes may be at the origin of a change in the phytodiversity. On talus slopes exposed in the past to only limited anthropic pressure, this phenomenon may be interpreted as a consequence of frequency and intensity deceleration of niveo-periglacial processes due to climatic change. This study is based on a geo-ecological approach of talus slopes mosaics. The methodology used enabled us to characterize the structure and the functionning of talus slopes mosaics but also define their evolution over the last century. Furthermore, this study underscores the richness of these habitats, wich could become observatories of choice for monitoring phytodiversity evolution under the effects of current environmental changes.
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https://tel.archives-ouvertes.fr/tel-00011509
Contributor : Sylvie Arques <>
Submitted on : Wednesday, February 1, 2006 - 5:08:21 AM
Last modification on : Friday, November 6, 2020 - 3:49:07 AM
Long-term archiving on: : Monday, September 17, 2012 - 11:40:18 AM

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  • HAL Id : tel-00011509, version 1

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Sylvie Arques. Géodynamique, colonisation végétale et phytodiversité des talus d'éboulis dans le massif de la Grande Chartreuse (Préalpes françaises du Nord). Caractéristiques géo-écologiques et sensibilité aux changements environnementaux.. Sciences de l'Homme et Société. Université Joseph-Fourier - Grenoble I, 2005. Français. ⟨tel-00011509⟩

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