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Characterics of the Sodic saline soils of the Duero Basin (Spain) a Review

AutorGallardo, Juan F. ; González Hernández, M. I.
Palabras claveDuero Basin
Semiarid soils
Saline soils
Sodic soils
Fecha de publicación1997
CitaciónInternational Symposium on Salt-affected Lagoon Ecosystems, ISSALE 95: 99-108 (1997)
ResumenThe distribution of the sodic saline soils of the Duero Basin (Provinces of Salamanca, Avila, Valladolid, Palencia and León) is reviewed. Although they are not very abundant in the area, the sodic saline soils can be mapped south of the River Duero (Province of Valladolid), patches also appearing in the area of surrounding the lakes of Villafáfila (Zamora). La Armuña (Salamanca), the Valle de Amblés (Avila) and in the dried, old lake of La Nava (Palencia). In general, they have been classified as Solonchaks (gleyic or sodic) and Solonetzs (sodic and gleyic); phenomena of solodization (such as in the Valle de Amblés) are rarely observed due to the frequent presence of carbonates. Regardless of the cartographic studies made in the region, overall the analytical data are mostly routine: pH, conductivity (salinity) or typology of clays. Accordingly, for a more complete knowledge of these soils more information concerning the exchange complex and soil solution is required. This should afford the possibility of a better classification and knowledge of the evolution of the soils. Nevertheless, it can be stated that the most important factors involved in the formation of these soils, apart from a semi-arid climate, is the topography (endorrheic zones), a high water level and the presence of soluble salts. The frequent presence of calcium carbonate limits the percentage of sodium ions in the cation exchange complex.
Descripción10 páginas, 2 figuras.-- Congreso celebrado en Valencia (Spain) 18-25 September 1995
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