Redistribution of the Cs Stock in the Heather Pine Forest Biogeocenosis after a Crown Fire in the Chernobyl Nuclear Power Plant Exclusion Zone

An assessment of the distribution of the Cs stock in the elements of the biogeocenosis of heather pine forest and on the burning formed in its place after a steady crown fire in the exclusion zone of the Chernobyl nuclear power plant was carried out. A year and a half after the pyrogenic effect, a decrease in the content of radionuclide in the wood of a dead pine stand, forest litter and the emerging living ground cover and an increase in its activity in the bark and natural renewal of woody and shrubby plants was established. During this time, the forest litter has restored the functions of the main radionuclide depot in the biogeocenosis and the biogeochemical barrier on the way of its vertical migration. The stock of Cs in the mineral part of the soil has increased. A significant redistribution of the radionuclide occurred in its upper 200 mm thickness. No significant change in the total activity of Cs in the transformed biogeocenosis after a steady crown fire has been established.