Initial Stages of Smectite Chloritization in the Humus-Eluvial Horizon of Podzolic Soil in the Model Field Experiment

摘要

A field experiment was conducted to study the initial stages of chloritization (aluminization) of smectite (fraction <1 mu m) with various composition of interlayers in the AELoa horizon of the podzolic soil in the course of current pedogenesis. Application of XRD analysis coupled with the simulation of experimental diffraction patterns led us to a conclusion that during one-year incubation in the soil, Na-smectite was chloritized, and the degree of Na-Al-smectite chloritization increased. Smectite chloritization results in the formation of a disordered mixed-layer mineral comprising smectite layers and layers with interlayer spaces partially filled with aluminum polyhydroxycations and Ca(2+)cations. A discrete phase of soil chlorite has not been formed during one year of the experiment.