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MODELISATION DE LA RELATION ENTRE PLUIE POLLINIQUE ACTUELLE, VEGETATION ET PRATIQUES PASTORALES EN MOYENNE MONTAGNE (PYRENEES ET JURA)

Application pour l'interprétation des données polliniques fossiles

Abstract : The reliability of pollen analysis as a tool for the reconstruction of past vegetation and landscape depends on our knowledge of modern ecosystems. These reconstructions involve precise understanding of modern plant communities and how they are reflected in pollen assemblages.
The calibration between present pollen deposition and vegetation has been studied with two approaches in pastoral areas of middle range mountains. In Pays Basque, the comparative approach differentiated well dispersed pollen taxa and a pool of pollen which indicates local grazing activities. These results were used to reconstruct local pastoral activity from fossil pollen records for the last 2000 years. Multiscale interpretation of pollen assemblages, use of multiproxy (pollen and non pollen palynomorphs) and complementary information from other fields (pastoral archaeology, history) give a better understanding of spatial dimensions and intensity of pastoral activities. In the Jura Mountains, Extended R-value model was used to estimate the relevant source area of pollen assemblages deposited in moss polsters (Radius of 300 m). Pollen productivity estimates were calculated for several taxa characteristics of woodland pasture landscape. This set of data is the first step for quantitative reconstruction of past landscape.
These approaches aim to assess the structure and the composition of past landscape and to evaluate pastoral impact on past ecosystems. They will provide useful information for predictive models in various disciplines (climate modeling, nature conservancy...)
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https://tel.archives-ouvertes.fr/tel-00123869
Contributor : Florence Mazier <>
Submitted on : Thursday, January 11, 2007 - 11:47:51 AM
Last modification on : Wednesday, December 2, 2020 - 10:06:02 AM
Long-term archiving on: : Friday, September 21, 2012 - 10:01:27 AM

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  • HAL Id : tel-00123869, version 1

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Florence Mazier. MODELISATION DE LA RELATION ENTRE PLUIE POLLINIQUE ACTUELLE, VEGETATION ET PRATIQUES PASTORALES EN MOYENNE MONTAGNE (PYRENEES ET JURA)

Application pour l'interprétation des données polliniques fossiles. Ecologie, Environnement. Université de Franche-Comté; Université de Neuchâtel, 2006. Français. ⟨tel-00123869⟩

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