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Dynamique des paysages végétaux depuis la fin du Petit Âge Glaciaire au Spitsberg (79°N). Analyse intégrée de la reconquête végétale des marges proglaciaires.

Abstract : As a result of global climatic changes that followed the Little Ice Age, most Arctic glaciers are retreating and more areas are becoming available for plant colonization. Such a process can be observed on Svalbard in the frontal areas of five glaciers, located on the north western coastline and in the central part of the island. To determine the relationship between retreating glacial fronts and plant colonization processes, systematic releves are normally utilized. The resulting data usually indicate that time since glacial retreat is the primarily determining of vegetation evolution in terms of physiognomy and floristic composition. Although the floristic sequence is the same from the early pioneer stages to later mature ones, we found that this process is neither homogeneous nor explicitly time dependent. For example, environmental position, such as changes in micro-topographic relief, may also be an important factor in determining variation in the colonization process and can interfere with the normal time dependent colonization process. Within one proglacial area we observed floristic variation between different micro-topographic environments utilizing releves and a digital elevation model with a 2 m spatial resolution. This allowed us to examine floristic changes along both temporal (time from glacial retreat) and spatial (micro-topographic relief) scales. Using a probabilistic model, we were able to map the temporal and spatial effects on plant colonization in these glacial forelands and produce new landscape nomenclature to describe them.
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https://tel.archives-ouvertes.fr/tel-00011178
Contributor : Myrtille Moreau <>
Submitted on : Wednesday, December 21, 2005 - 4:15:12 PM
Last modification on : Wednesday, March 4, 2020 - 12:22:19 PM
Document(s) archivé(s) le : Tuesday, April 6, 2010 - 4:26:26 PM

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  • HAL Id : tel-00011178, version 1

Citation

Myrtille Moreau. Dynamique des paysages végétaux depuis la fin du Petit Âge Glaciaire au Spitsberg (79°N). Analyse intégrée de la reconquête végétale des marges proglaciaires.. Géographie. Université Blaise Pascal - Clermont-Ferrand II, 2005. Français. ⟨tel-00011178⟩

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