Abstract
A study was made to determine to what extent the mineralogical composition of the clay fraction can be related to the total surface area (So) as well as the cation exchange capacity (CEC) values of Gleysolic soils. Eleven soil profiles were sampled in the regions of Montreal, Quebec and Lake St-Jean. Mineralogical composition, surface area and exchange capacity of the clay fraction, and surface area and exchange capacity of the soils were determined. Results showed good agreement between the experimental measurements of surface area and exchange capacity and the calculated figures obtained by using mineralogical composition and theoretical values of So and CEC of each mineral. The variations in the mineralogical composition of the clay fraction were related to the difference in the degree of evolution of the soils in the three regions.
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