Particle size composition features of automorphic soils in north-and mid-taiga subzones of Karelia

Characteristic features of the particle size composition of automorphic soils in the north- and mid-taiga subzones of Karelia are considered. The content of sand, silt, and clay in the genetic horizon of forest soils in pine and spruce forests is reported based on the vast experimental material. Distribution patterns of the set of particles of varying size across the averaged automorphic soil profile were identified. The data were processed statistically with the use of Student's t-test. The zonal differences in the content of different grain size fractions in soil horizons were found to be reliable.