As a result of nuclear weapons tests and accidents of nuclear power plant which has occurred during the recent history, a radiocaesium (137Cs) was released to the environment. Considering the half-life, radiocaesium has been still presented and detected in the components of the Czech environment, especially in forest ecosystem. Radiocaesium content and transfer was studied in the individual biotic component of forest ecosystem using the bilberry plants (Vaccinium myrtillus L.) which excel in effective radiocaesium accumulation ability. During the last three years, the collection more than 350 samples was conducted. The samples of vegetative and generative parts of bilberries and soil samples were collected from mountain area of interest which were severely contaminated with radiocaesium. Average surface activity of radiocaesium was 4007 Bq.m-2 for Jeseníky, 2807 Bq.m-2 for Orlické hory and 1783 Bq.m-2 for Krkonoše. Depending on the soil properties of the sample locality, the aggregated transfer factor (TF-AG) was established. The aggregated transfer factor for radiocaesium reached values ranging from 4,42E-03 to 3,25E-01 m2.kg-1. The values of aggregated transfer factor demonstrated slight but statistically highly significant negative correlations with content of clay particles. The weak but statistically significant positive correlation between aggregated transfer factor and content of humus was determined. The slight but statistically significant negative correlation between aggregated transfer factor and active soil reaction was also identified. The correlation between TF-AG and altitude was not proven. However, based on the multivariate analysis the Generalized Linear Model (GLM procedure), only content of clay particles and active pH had highly significant effect on the aggregated transfer factor. Effect of other tested factors was not established. Radiocaesium translocation analyses demonstrated the significant seasonal variation of 137Cs in bilberry plant. Radiocaesium percentage representation was identified in the individual parts of bilberry plant as follows. Stems of bilberry demonstrated the lowest content of radiocaesium, then fruits, subsequently leaves and the root kept the highest content of radiocesium. Consumption of herbal bilberry tea and bilberry fresh fruit does not endanger the health of the Czech population and the contribution to total radiation dose is negligible.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:425007 |
| Date | January 2017 |
| Creators | Šoukalová, Červinkov |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/doctoralThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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