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Andosolisation dans les Hautes Vosges : conditions de développement et comparaison avec les autres processus de pédogenèse

Abstract : During the last few years, the Andosol concept has undergone significant modifications leading to the setting up of new definition and classification rules by the international commissions. In the Vosges mountains, where some soils with andic features have been studied in the past, the use of these criteria coupled with a field survey shows the presence of Andosols. The limiting factors and the necessary conditions for andosolisation in the Vosges, where brunification and podzolisation usually prevail, have been established by a precise characterisation of these soils, a study of the processes occuring within them and a comparison with other soils from the Vosges or with Andosols from other areas. Andosols from the Vosges have low contents of allophanes and high amounts of stable and immobile organo-metallic complexes, but they show a weak stage of development and the y cover only a small area. Andosol formation needs the union of favourable climatic conditions and parent rock: the former can only be found in the highest parts of the moutains, where humid conditions allow mineral weathering and cold temperatures reduce the mineralisation of organic matter by biological activity. In such environments, andosolisation needs basic rocks with high amounts of weatherable mineraIs. The chemical composition of the parent rock appears to be the main factor governing pedogenesis. The development stage of the process is mainly governed by the rock's texture, mineralogy and compactness. The absence of loose pyroclastic materials rich in glass can explain some particularities of this andosolisation : weak development and absence of allophanes.
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Submitted on : Thursday, March 29, 2018 - 11:43:26 AM
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Delphine Aran. Andosolisation dans les Hautes Vosges : conditions de développement et comparaison avec les autres processus de pédogenèse. Science des sols. Université Henri Poincaré - Nancy 1, 1998. Français. ⟨NNT : 1998NAN10086⟩. ⟨tel-01748625⟩



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