Nuevos índices cronológicos de evolución de los suelos en terrazas fluviales
DOI:
https://doi.org/10.3989/egeol.97531-2242Keywords:
Chronosequence, indices, clay content (CC), global clay content (GCC), illuviation (ILL), ageing (clay silt ratio, CS)Abstract
A soil chronosequence on fluvial terraces of the Tajo river (Aranjuez-Toledo sector, Central Spain) is studied in order to establish the variation of soil properties with time. Relative chronology of terraces has been established based on vertebrates fauna, lithic industry, geomorphic criteria, and by correlation with other terrace systems of the Tajo basin.
Sorne indices have been established as estimators of soil evolution degree: CC: clay content (%) in Bt horizon; OCC: global clay content, obtained by the product of thickness and clay percentage of Bt; CS: clay/silt ratio, which results from the division of clay percentage and silt percentage in Bt horizon, and constitutes an estimation of the soil ageing; ILL: illuviation index, or ratio between clay content in Bt horizon and clay content in the overlying horizon.
The study of correlations among the properties of argillic horizons and the aforementioned indices and the relative age of the soils have been carried out. The application of these indices to other similar chronosequences confirm their validity. The best results have been obtained for the CS index (ageing index), OCC and CC. Illuviation index shows a great variability, so its use as an evolution criterion is less precise, because it is affected by the total preservation or truncation of the upper part of the original profile.
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