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Un siècle de dynamiques paraglaciaires et végétales au Svalbard (Midre Lovénbreen, Spitsberg nord-occidental)

Myrtille Moreau 1 Denis Mercier 2 Dominique Laffly 3
2 LETG - Nantes - Littoral, Environnement, Télédétection, Géomatique
CNRS - Centre National de la Recherche Scientifique : UMR6554, EPHE - École pratique des hautes études, UNICAEN - Université de Caen Normandie, UBO - Université de Brest, UR2 - Université de Rennes 2, IGARUN - Institut de Géographie et d'Aménagement
Abstract : Climatic changes that took place since the end of the Little Ice Age have considerably disturbed environmental balances in the high latitudes. In Spitsbergen (79°N) (Svalbard archipelago) valley glaciers moved back ca. 1 km in one century. In the recently deglacia- ted areas, new paraglacial processes have been acting on the landscape. They are accompanied by plant colonisation, the dynamics of which correlate with the increase through time of plant cover andfloristic diversity. The paraglacial dynamics, however, contribute with gelifluction to the instability of the sedimentary deposits at different time and spatial scales and partly destroy the plant cover. There is thus a strong interactive link between postglacial morphogenic process and plant dynamics. The present studies were carried out in the Midre Lovénbreen foreland at Br0ggerhalv0ya in Spitsbergen during 2001 and 2002. They allowed us to establish a chronology of plant colonisation in deglaciated areas in relation to the level of instability of the geomorphic environments.
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Myrtille Moreau, Denis Mercier, Dominique Laffly. Un siècle de dynamiques paraglaciaires et végétales au Svalbard (Midre Lovénbreen, Spitsberg nord-occidental). Géomorphologie : relief, processus, environnement, Groupe français de géomorphologie (GFG), 2004, 10 (2), pp.157-168. ⟨10.3406/morfo.2004.1211⟩. ⟨halshs-00468688⟩



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