Soil adsorption complex of the meadow-chestnut soils at the Dzhanybek research station in the northern Caspian region |
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| Authors: | A V Kolesnikov T A Sokolova M L Sizemskaya |
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| Institution: | (1) Institute of Forestry, Russian Academy of Sciences, Uspenskoe, Moscow oblast, 143030, Russia;(2) Faculty of Soil Science, Moscow State University, Leninskie gory, Moscow, 119992, Russia |
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| Abstract: | Data on the composition and properties of soil adsorption complex in the virgin and ameliorated meadow-chestnut soils in the northern Caspian region are generalized. It is shown that the experimental values of the effective CEC in the A1 horizon are lower than those calculated on the basis of data on the organic matter content and the content and mineral composition of fine fractions. We explain this discrepancy by the interactions between the organic matter and clay minerals resulting in the blocking of a part of the exchangeable positions. In the BC horizon, the experimental values of the effective CEC are twice as high as those calculated from the data on the amount of labile clay minerals in fine fractions. This can be explained by the presence of sorption centers on poorly crystallized illites and chlorites in the clay fraction and by the partial aggregation of clay material into coarser fractions that cannot be destroyed upon the separation of clay fractions by the Aidinyan procedure, which leads to the underestimation of the clay content. |
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