Some features of trace element content in alluvial soils of the Desna River

The results of the study of the total amount and mobile forms of Cd, Pb, Zn, Cu, Ni, Co and Cr are presented. The studies were conducted in the Bryansk Region, Russia, in the landscapes of the Desna River floodplain. Soil samples were collected using the soil key method (92 soil pits). High variability of gross amount and mobile forms of cadmium, lead, zinc, copper, nickel, cobalt and chromium in alluvial soils of the Desna River is shown. The presence of a correlation between the gross content of trace elements in the soil and its granulometric composition is established. According to the concentration clarke value, the elements are grouped in a descending series: Cu > Pb > Zn > Co > Ni > Cr > Cd, similar to that in alluvial soils of other rivers in the region. A geochemical index of floodplain soils of the Desna River has been compiled, which allows one to judge the potential reserve of trace elements. The mobility series of trace elements Cd > Ni > Pb > Zn > Cu > Co > Cr has been established, similar to that in soils of a different genesis. A correlation has been established between the content of the mobile form of cadmium, copper, nickel and cobalt and the content of physical clay in the soil. The degree of zinc, copper and cobalt supply of floodplain soils of the Desna River is shown. The need for their additional amount when growing agricultural products is noted.