Some indicators of biological cycle of <sup>137</sup>Cs and <sup>39</sup>K in forest ecosystems of Bryansk woodland in the remote period after Chernobyl fallouts
On the example of ecosystems of Bryansk woodland we are looking at the specialties of a biological cycle of 137Cs and 39К in а long period after Chernobyl fallouts. It is shown that in investigated phytocenoses reserves of 137Cs in general biomass are concentrated in wood, minimal - in the outer layers of the core, in the yearly production, in assimilating organs and outer layers of the core respectively. The distribution of K reserves in overall biomass and yearly production almost identical to 137Cs. For now new arrival of 137Cs into the soil with litter in pine and birch forests is estimated as about 50% from BK capacity. Most of all 137Cs comes with assimilating organs (needles and leaves). In pine forests the return of K into the soil with litter is almost the same as for 137Cs.