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Observations sur la présence de sols ferrallitiques dérivés de matériaux volcaniques aux Iles Canaries

Otros títulosObservations about the presence of ferrallitic soils derived from volcanic materials in the Canary Islands
AutorQuantin, Paul; Tejedor Salguero, M. L.; Fernández Caldas, E.
Fecha de publicación1978
EditorInstitut de recherche pour le développement (France)
CitaciónCahiers ORSTOM 16(2): pp. 155-175 (1978)
ResumenIn the perhumid climate belt of the Canary Islands and on plio-pleistocenic rocks, some unusual complex soils have been observed. These soils show : firstly in the depth, a very advanced weathering process, the characteristics of wich look like those of Ferrallitic Soils (Ultisols), secondly at the top, a humiferous soil, such as unsaturated Andosols (Dystrandepts). The authors deal successively with the ecological conditions, then their morphological, physico-chemical and mineralogical characteristics. Afterwards, they attempt to do an interpretation of data and to propose a classification of these soils in the french and american Systems. In cloncusion, they propose the hypthesis that the old alteration products have been probably processed in wetter and warmer climatic conditions than at the present time; however, they remark that the ferrallitization can proceed still now, bul discreetly, in the Andosols, especially by the processing of some gibbsite.
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