Pedochronological Rows of Medieval Burial Mounds, Pskov Region

The soils buried under the early medieval mounds of the 9th and early 11th centuries have been studied. The reconstruction of the influence of natural changes in the natural environment on the dynamics of soil formation processes was carried out on the basis of a comparative analysis of the properties of soils buried under mounds of different ages, day (background) and newly formed on mound structures; supplemented with data on the time of soil formation on sandy soil-forming rocks in the taiga zone. The study area belongs to the Baltic province of soddy-podzolic soils of the southern taiga subzone. Soils buried under mound structures during periods with different climatic conditions are described. Soils that developed before burial in a cool and humid climate of the 8th-9th centuries. AD, are characterized by the mobility of iron forms along the profile and a morphologically pronounced accumulation of bleached quartz grains in its upper part. The influence of the warm and dry climate of the X century. AD on the processes of soil formation is manifested in the lower mobility of iron compounds and more active humus accumulation, less clarification of mineral grains. The time of formation of the profile of soddy podbur in the material of mound structures is estimated at 1 thousand years. The construction of the mound structures consisted in successive filling of the shaft from the edges to the center of the site, in which the material of the middle horizons of the original soil turned out to be in the upper part of the mound.