Resumo

VILLEGAS, D.C.; PEREYRA, F.X.  e  FERRER, J.A.. Soils, soil forming factors and pedogenetic processes of a sectorin the central-western Santa Cruz province. Rev. Asoc. Geol. Argent. [online]. 2007, vol.62, n.3, pp.366-374. ISSN 0004-4822.

The study area is located in centralwestern Santa Cruz including El Chaltén town between 49°00' and 49°36'S - 73°30' and 72°00'W. Environmental variability, relief, parent material, altitude, climate, vegetation and soils were recognized. According to characteristics of the soils, it is possible to differentiate three sectors: western, central and eastern. Inceptisols, Spodosols and Andisols dominate in the first, meanwhile in Central area the main soils are Molisolls and Entisols. Aridisols and aridic Entisols dominate in the Eastern sector. A west-east variation trend, in relation to soil features could be established: an increase in pH, CEC, exchangeable bases and % of CaCO3. Inversely there is an increase % C, pHNaF (in udic regime soils) and divalent/monovalent cations relationship.

Palavras-chave : Soils; Soil forming factors; Pedogenetic proceses; El Chaltén; Santa Cruz province.

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