COMPARISON OF THE SEDIMENTATION METHODAND THE LASER-DIFFRACTION ANALYSIS DURING DETERMINATIONOF SOIL TEXTURE OF NATURAL AND TECHNOGENIC LANDSCAPES

Comparison of the standard sieve-pipette method and the laser-diffraction analysis (SALD-201V, Shimadzu, Japan) during determination of soil texture of natural mountain-taiga and forest-steppe zones and technogenic landscapes of the Western Siberia is carried out as well as the convergence of obtained results is evaluated. It was determined that in soils of natural landscapes the obviously lower content of clay and the larger content of fine and medium silt were obtained with laser-diffraction in comparison with sedimentometry. At the same time in the young soils of technogenic landscapes the less content of the same fractions was revealed which is due to the nature of the organic matter in these soils. Little difference in results during determining of the integrated physical clay fraction in natural soils by two methods was obtained, in contrast to its constituent individual fractions. In general, promising use of laser diffractometers for the study of particle-size composition of soils was shown.

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