ИСТИНА

Research of the investigated territory (~ 400 Ha) with the method of soil pits excavation and profile description as well as horizontal electric profiling (HEP) with portable geophysical device (LandMapper ERM02), have revealed specific lithological and geomorphological features at adjacent geomorphological levels. Parent materials for the soils of the area were two-layer deposits (ancient lake sandy loams underlain by lake glacial clays and silty loams) located at I-II levels with elevation a.s.l.= 130–160 m and silty loams located at top (III-V) levels with elevation up to a.s.l.=230 m. Agrozems and plow Albelufisols are dominating components of soil cover. Electrical profiling to the depth of 0.3 m (plow horizons) precisely isolated sandy deposits (fine sand) within I level, which had electrical resistivity (ER) of 200-300 Ohm m from more silty sandy loams (II level), which has lower ER=100–150 Ohm m. Within III level fine sandy silty loams (ER = 200–300 Ohm m) dominated, which were replaced at IV-V levels (a.s.l. 175–230 m) by silty loams with ER=50–150 Ohm m. Deeper horizontal electrical profiling (up to 0.5 m) outlined electrical resistivity under plow horizon, in subsoil of anthropogenic transformed soils. Precise submeridional narrow areas with sharp increase in resistivity up to 200–300 Ohm m were revealed within the limits of IV level with HEP. They corresponded to occurrence of sandy deposits within silty loams, which were deposited during degradation of wide extraglacial lakes existed within the study area during Late Pleistocene. Within the limits of the V level ER at depth 0.3 and 0.5 m are similar and equal 50–100 Ohm m. Thus, it is possible to approve, that by using methods of soil field electrophysics various thin features of ancient lakes deposits and anthropogenic transformed soils within the investigated area are successfully identified.