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Bulletin de la Societe Geologique de France; January 2002; v. 173; no. 1; p. 77-86; DOI: 10.2113/173.1.77
© 2002 Societe Geologique de France
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Nature and genesis of spodic horizons characterized by inverted color and organic content in a subalpine podzolic soil (Pyrenees Mountains, France)

Mireille Remaury1, Priscia Oliva2, Bernard Guillet3, François Martin2, Francois Toutain4, Joseph Dagnac5, Jean-Marc Belet1, Bernard Dupré2 and Thierry Gauquelin1

1 UMR 5552, LET, Université Paul Sabatier, 39 allées Jules Guesde, F-31062 Toulouse cedex, France.
2 UMR 5563, LMTG, Université Paul Sabatier, 38 rue des 36 ponts, F-31400 Toulouse, France.
3 URA-CNRS 724, LGO, Université d’Orléans, BP 6759, 45067 Orléans, France.
4 UPR 6831 du CNRS associé á l’Université Henri Poincaré, BP 54501 Vandoeuvre-les-Nancy cedex, France.
5 UMR C 5576, Université Paul Sabatier, 118 route de Narbonne, F-31062 Toulouse cedex, France.

Abstract

Podzolic soils showing an inverted sequence between Bh and Bs horizons have been recently described in the French Pyrenees. This paper deals with the spodic characters of two inverted podzol profiles found in the granitic Estibère valley. Taking into consideration a coherent genesis of these soils, we perform this study through a multidisciplinary approach (e.g., pedology, mineralogy). We describe the evolution of the different forms of free iron and aluminum in relation to organic constituents and the mineralogical characteristics of the soil. Spodic criteria indicate that those soils could be classified as podzolic soils. The study of the spodic horizons show the existence of an ochrous horizon "BP1", rich in immobilized forms of iron (i.e., amorphous and partially crystallized forms). It overlies a darker chocolate colored horizon "BP2" rich in organic-complexed aluminum, aluminosilicate gels and humic constituents, particularly humic acids. We explain the organic accumulation in the deep "BP2" as the result of particular seasonal hydrologic processes related to the geomorphologic and climatogenic situations of the soils profiles.

Key Words: Podzolic soils • Subalpine level • Organic accumulation • Weathering processes • Pyrenees






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