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The role of helophytes in 137Cs migration into various components of aquatic ecosystems of different types was investigated. It has been found that 74-87% of 137Cs total storage in the phytomass was registered in the underground organs of Phragmites australis and 61-86% - in the underground organs of . As a result of dying away of the aboveground organs of helophytes, 5-11% of 137Cs total content in the phytomass can income into the water due to the release of the exchanged forms of the radionuclide. In this case, 8-31% of 137Cs will remain in the detritus. Annually as a result of dying away of the above-ground and underground organs of helophytes, 53-85% of 137Cs accumulated in the phytomass incomes into the bottom sediments. In this case, 9-19% of 137Cs remains in the wintering rhizomes. The activity of 137Cs accumulated in helophytes is not more than 6% of its content in bottom sediments occupied by plant communities. After helophytes dying away, secondary contamination of the water with 137Cs can attain 0.4% of its activity in bottom sediments occupied by plant communities, about 1.1% can income into the detritus, and 4.2% - into the bottom sediments. |
