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"Hautes terres" : l'anthropisation des monts d’Aubrac et du Lévezou (Massif Central, France) durant l’holocène : approche palynologique des dynamiques socio-environnementales en moyenne montagne

Abstract : Based upon a multidisciplinary approach centered on palynology, the aim of our study was to better understand the long-term interaction in human/vegetation processes in the Aubrac and Levezou mountainous regions (Massif Central, France). In a first step, the relationships between present pollen deposition, vegetation and land-uses have been studied using a comparative approach. The main pollen taxa representative of human activities have been isolated and their spatial and functional representativeness have been assessed. Secondly, six sedimentary records, supported by 24 radiocarbon dates, have been studied with a multi-proxy approach combining pollen, macro charcoals, non-pollen palynomorphs, archeological and historical data. The analysis has allowed us to characterize vegetation history and local human impact on the landscape, in particular rhythms, breaks and thresholds concerning anthropisation’s dynamics According to our analysis, the first signs of human impact on the vegetation appear in Aubrac during the middle Neolithic period, while evidence of human activities seem to extent during the Late Neolithic. The Iron Age and early Antiquity periods are characterized by large scale deforestation correlated to the increase of the agro-pastoral pressure. Our analysis further suggests that the medieval and modern periods consolidate the types of landscape that have been created in earlier periods. The dynamics that have been highlighted in this study suggest an important degree of spatial variability of land use. The analyzed territories present common trends that correspond to colonization trajectories generally encountered in mountain areas. Relative to anthropisation’s dynamics, climate forcing seems to have not been a limiting factor for human settlements and may even have been a positive stimulus promoting the development of new adaptive land use strategies.
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Élodie Faure. "Hautes terres" : l'anthropisation des monts d’Aubrac et du Lévezou (Massif Central, France) durant l’holocène : approche palynologique des dynamiques socio-environnementales en moyenne montagne. Géographie. Université Toulouse le Mirail - Toulouse II, 2012. Français. ⟨NNT : 2012TOU20087⟩. ⟨tel-00921259⟩

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