Holocene land-use evolution and associated soil erosion in the French Prealps inferred from Lake Paladru sediments and archaeological evidences |
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| Authors: | A Simonneau E Doyen E Chapron L Millet B Vannière C Di Giovanni N Bossard K Tachikawa E Bard P Albéric M Desmet G Roux P Lajeunesse JF Berger F Arnaud |
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| Institution: | 1. ISTO, UMR 7327 CNRS, Univ. Orléans, BRGM, 1A rue de la Férollerie, 45071 Orléans Cedex 2, France;2. Laboratoire de Chrono-Environnement, UMR 6249 CNRS, UFR des Sciences et Techniques, 16 route de Gray, 25030 Besançon, France;3. CEREGE, Université Aix-Marseille, CNRS, IRD, Collège de France, Technopole de l''Arbois, BP80, 13545 Aix en Provence, France;4. E.A. 6293 GéHCO, GéoHydrosystème COntinentaux, Université F. Rabelais de Tours, Département Géosciences-environnement, Faculté des Sciences et Techniques, Parc de Grandmont, 37200 Tours, France;5. Université Lyon 1, UMR 5023 Ecologie des Hydrosystèmes Naturels et Anthropisés, ENTPE, CNRS, 3, Rue Maurice Audin, 69518 Vaulx-en-Velin, France;6. Centre d''étude nordiques et Département de Géographie, Univ. Laval, Québec, QC, Canada;g UMR 5600 EVS du CNRS, Université Lyon 2, Faculté Ghhat, 5 Avenue Pierre Mendès-France, 69676 BRON Cedex, France;h EDYTEM, Université de Savoie, CNRS Pôle Montagne, 73376 Le Bourget du Lac, France |
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| Abstract: | A source-to-sink multi-proxy approach has been performed within Lake Paladru (492 m a.s.l., French Prealps) catchment and a 6-m long sediment sequence retrieved from the central lacustrine basin. The combination of minerogenic signal, specific organic markers of autochthonous and allochthonous supply and archaeological data allows the reconstruction of a continuous record of past human disturbances. Over the last 10,000 years, the lacustrine sedimentation was dominated by autochthonous carbonates and the watershed was mostly forest-covered. However, seven phases of higher accumulation rate, soil erosion, algal productivity and landscape disturbances have been identified and dated from 8400 to 7900, 6000 to 4800, 4500 to 3200, 2700 to 2050 cal BP as well as AD 350–850, AD 1250–1850 and after AD 1970. Before 5200 cal BP, soil erosion is interpreted as resulting from climatic deterioration phases towards cooler and wetter conditions. During the Mid-Late Holocene period, erosion fluxes and landscape disturbances are always associated with prehistorical and historical human activities and amplified by climatic oscillations. Such changes in human land-used led to increasing minerogenic supply and nutrients loading that affected lacustrine trophic levels, especially during the last 1600 years. In addition, organic and molecular markers document previously unknown human settlements around Lake Paladru during the Bronze and the Iron Ages. |
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| Keywords: | French Prealps Holocene Lake sediment Organic geochemistry Land-use Soil erosion |
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