In this chapter, activity concentration of 90Sr in the soil and plants from different types of ecosystems in the Belarussian sector of the exclusion zone of Chernobyl NPP after three decades of accident is shown. Lateral migration of 90Sr and variability of its activity in the topsoil in different forest types are discussed here. Influence of soil properties and peculiarities of species in plant communities on the accumulation of the radioisotope in the main compartments of ecosystems is presented. The obtained results may be actuals for designing of mathematical landscape models intended for the forecast of space-time redistribution of radioisotopes after emergency emissions. The authors proved that soil litter is an integral indicator of affinity the living parts of an ecosystem regarding the radioisotope.
