^<137>Cs Soil-to-plant Transfer for Individual Species in a Semi-natural Grassland. Influence of Potassium Soil Content

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In the present study we assessed the radiocaesium uptake by plants in order to piece together information on factors affecting the uptake processes, particularly K supply and plant species differences. Vegetation uptake from soil contaminated by the Chernobyl accident was compared at two semi-natural grasslands. The Cs/K discrimination factor (DF), which is often used to evaluate a plant's efficiency in absorbing nutrients from soil, was estimated. The obtained DF values (0.01 to 0.8) vary with K soil concentrations and plant species, indicating that the ^<40>K is more efficiently absorbed than ^<137>Cs. The soil-to-plant relationship was evaluated by means of the transfer factor (TF). The ^<137>Cs TF_<sp> values obtained from separated plant species varied within the range of 0.016 to 0.400 (site 1) and 0.017 to 0.171 (site 2). When mixed grass samples were considered a large variation was observed, mainly for site 1. The ^<137>Cs TF_<mix> ranges were: 0.018 to 0.250 for site 1 and 0.017 to 0.167 for site 2. These values fall within the range of TFs commonly reported (0.0001-1). Our present data suggest that these pastures are apt for forage use. Different plant species presented different individual behavior regarding their ^<137>Cs TF_<sp> when the ^<40>K soil activity concentration was taken in account. For most of the species analyzed, we observed a gradual decrease in the individual ^<137>Cs TF_<sp> when the ^<40>K soil activity concentration was increased, with the exception of Taraxacum officinale at one of the sampling sites.
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^<137>Cs Soil-to-plant Transfer for Individual Species in a Semi-natural Grassland. Influence of Potassium Soil Content

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