Specifics of accumulation of 137CS in phytomass of species of grass-dwarf-shrub layer of oligotrophic and mesotrophic bogs of Western Polissya of Ukraine
DOI:
https://doi.org/10.31548/biologiya2019.03.092Keywords:
137Cs, oligotrophic bog, mesotrophic bog, grass-dwarf-shrub layer, transfer factorAbstract
The article presents results of research of the accumulation of 137Cs by the species of grass-dwarf-shrub layer of oligotrophic and mesotrophic bogs in the territory of Western Polissya of Ukraine. The research was carried out during 2004-2012 in the north of Rivne Oblast for 15 experimental sites situated in different types of oligotrophic and mesotrophic bogs. In the experimental sites, the density of pollution of radionuclide of peat soils was investigated, the specific activity of 137Cs in vascular plant species was determined, and the transfer factors (Tf) for each species were determined.
The ranked series of species based on Tf in different types of bogs have been constructed. It was revealed that a significant fluctuation of the specific activity of radionuclide in the investigated species was observed on each experimental site.
It was determined that for oligotrophic bogs, the highest levels of radionuclide accumulation were peculiar by water holes' species and species of the Cyperaceae family. The lowest values of the Tf for these habitats are marked in Ericaceae dwarf-shrubs which grow on microhills. For mesotrophic bogs, the highest values of Tf are determined for ferns, Cyperaceae and water holes' species, as well as for some species of dwarf-shrubs; the smallest values were characterized by shortgrowing willows. It has been shown that species of plants of one family or genus may have wide amplitude of accumulation of 137Cs.
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