Biotite weathering in peaty-podzolic gleyic soil under conditions of a model field experiment |
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| Authors: | T A Sokolova I I Tolpeshta I V Topunova |
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| Institution: | 1.Faculty of Soil Science,Moscow State University,Moscow,Russia |
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| Abstract: | Changes in biotite (fraction 1–5 μm) after exposure in the T2, H, Eih, and E horizons of peatypodzolic gleyic soil under conditions
of a model field experiment were studied by X-ray diffraction. It was found that the main transformations of the biotite in
all horizons included the degradation of its crystal lattice into regularly interstratified biotite-vermiculite and randomly
interstratified biotite-smectite structures and vermiculite. The transformation intensity decreased down the profile simultaneously
with a reduction in the content of organic matter, roots, and microbiota population and activity. Chloritized structures were
also present among the biotite weathering products in the E horizon. The main identified products of biotite weathering formed
in horizons Eih and E over a five-year period of the model experiment were detected in the clay and fine silt fractions of
these horizons and in native peaty-podzolic gleyic soils. This suggests that vermiculite and soil chlorite in the soils studied
are products of soil functioning. It follows from the results, with consideration for literature data, that the weathering
of biotite results in the formation of a potassium-buffering system. |
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