Microaggregate composition of alluvial soils of floodplain of Western Bug river

Abstract

The study of the microaggregative composition of soils of the floodplain of the Western Bug River has been carried out. The microstructure of these soils is characterized by considerable strength, especially in the transition horizons. In the alluvial sod short-profile soils, the fraction of fine sand prevails. The microaggregate fractions dominant in alluvial turf typical soils are micro aggregates in the size of 0,05-0,01 mm. Alluvial meadow soils are characterized by the lack of a clear distribution of microaggregates by profile. In the humus horizon of these soils dominated particles in the size of 0,05-0,01 mm. In alluvial meadow and wetland soils, there is an even distribution of the profile of microaggregates of all fractions. For the in-depth assessment of the results of the microaggregate analysis, a number of indicators have been calculated that assess the potential soil potential for microstructure formation: the Kachinsky dispersion factor (K, %), the Fageler structural factor (Kc , %), the degree of aggregation by Baver and Roathers (Ka , %), the microstructure rate for Dimo (Kd , %) and the number of aggregation for Pustovoitov (Kp , %). Consequently, the study of the microorganic composition of alluvial soils in the floodplain of the Western Bug River has shown that they are characterized by an extremely stable microstructure of the soil, high water resistance of microaggregates. The highest values of these indicators are alluvial turf and meadow soils, and somewhat lower – alluvial turf short-profile soils. Key words: microaggregate composition, alluvial soils, stability of microstructure.