Record ID No. |
2641 |
Author(s) |
Vinichuk M., Taylor A F S., Rosen K., Johanson K J. , 2010 |
Affiliation |
Department of Soil and Environment, Swedish University of Agricultural Sciences, P.O. Box 7014, SE-750 07, Uppsala, Sweden. Mykhailo.Vinichuk@mark.slu.se |
Title |
Accumulation of potassium, rubidium and caesium (133Cs and 137Cs) in various fractions of soil and fungi in a Swedish forest |
Source. Vol.(no):Page |
Science of the Total Environment. 408(12): 2543-2548.p |
Categories |
Mycorrhiza General |
Subjects |
Soil plant relations |
Sub-subjects |
Heavy Metals |
Host |
Plants |
Organism |
Fungi |
Country |
Sweden, Europe |
Abstracts |
Radiocaesium (137Cs) was widely deposited over large areas of forest in Sweden as a result of the Chernobyl accident in 1986 and many people in Sweden eat wild fungi and game obtained from these contaminated forests. In terms of radioisotope accumulation in the food chain, it is well known that fungal sporocarps efficiently accumulate radiocaesium (137Cs), as well as the alkali metals potassium (K), rubidium (Rb) and caesium (Cs). The fungi then enhance uptake of these elements into host plants. This study compared the accumulation of these three alkali metals in bulk soil, rhizosphere, soil-root interface, fungal mycelium and sporocarps of mycorrhizal fungi in a Swedish forest. The soil-root interface was found to be distinctly enriched in K and Rb compared with the bulk soil. Potassium concentrations increased in the order: bulk soil 137Cs could be prevented by providing additional Rb or K at contaminated sites. The levels of K, Rb, and Cs found in sporocarps were at least one order of magnitude higher than those in fungal mycelium. These results provide new insights into the use of transfer factors or concentration ratios. The final step, the transfer of alkali metals from fungal mycelium to sporocarps, raised some specific questions about possible mechanisms. |