Prediction of 137Сs accumulation by cranberry (Oxycoccus palustris Pers.) on the bogs of Zhytomyr Polissya in the modern period
Journal Title: Лісівництво і агролісомеліорація - Year 2013, Vol 122, Issue
Abstract
Introduction During the period after the Chernobyl catastrophe 137Cs accumulation by cranberry remains high in Zhytomyr Polissya. The latest study of radioactivity of cranberry was carried out in the region at 2007, so an analysis of contemporary intensivity of radionuclide accumulation by this berry plant as well as its substrata for growth has practical importance. Materials and Methods Analysis of 137Cs specific activity in berries and vegetative phytomass of cranberry as well as the radionuclide distribution among separate fractions of sphagnum cover (alive part, dead part and peat litter) was carried out on mezo-ombrotrophic and ombrotrophic bogs of Zhytomyr Polissya (Ukraine). Values of 137Cs concentration ratio in the system «fresh cranberry berries – air dry fraction of sphagnum cover» were calculated. Measurement of 137Cs specific activity was carried out gamma-spectrometrically in fresh cranberry berries and also in air-dry samples of all investigated components. Also dependence of 137Cs specific activity in fresh cranberry berries from the same index of 3 fractions of sphagnum cover was calculated. Results and Discussion As a result of study it was shown that 137Cs specific activity in cranberry berries was much more than in its vegetative phytomass. It was confirmed that during the vegetation period the distribution of 137Cs in fractions of sphagnum cover (growth substrata for cranberry) was especial. The highest values of 137Cs specific activity were observed in fraction of sphagnum alive, than – in sphagnum dead and peat litter. Conclusion 1. The mean values of 137Сs concentration ratio in the system «cranberry berries air-dry – cranberry shoots» varied on experimental plots in the range from 2,48 ± 0,16 on experimental plot №13 tо 0,70 ±0 ,002 on experimental plot №17. 2. The mean values of 137Сs concentration ratio in the system «fresh cranberry berries – sphagnum alive air-dry» had an amplitude from 1,10±0,07 on experimental plot №15 tо 0,62±0,05 on experimental plot №18; and in the system «cranberry berries air-dry – sphagnum dead air-dry» – from 1,87±0,28 on experimental plot №11 tо 0,67±0,05 on experimental plot №18. 3. The mean value of 137Сs concentration ratio in the system «fresh cranberry berries – sphagnum alive air-dry» in the whole data massif was 0,10 ± 0,01. 4. It was found close (r = 0,91–0,94) and reliable (р = 0,0000) linear relation between radionuclide content in fresh cranberry berries and each of 3 fractions of sphagnum cover. 5. Also it was calculated close (r = 0,92) and reliable (р = 0,0000) linear relation between radionuclide content in fresh cranberry berries and values of exposure dose of gamma-irradiation on the height 1 м, and also on the sphagnum cover which allows to use both equations on practice.
Authors and Affiliations
O. Orlov
Keywords
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