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Disparity in super(90)Sr and super(137)Cs uptake in Alpine plants: phylogenetic effect and Ca and K availability
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Disparity in super(90)Sr and super(137)Cs uptake in Alpine plants: phylogenetic effect and Ca and K availability
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Disparity in super(90)Sr and super(137)Cs uptake in Alpine plants: phylogenetic effect and Ca and K availability
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Journal Article
Disparity in super(90)Sr and super(137)Cs uptake in Alpine plants: phylogenetic effect and Ca and K availability
2012
Overview
Background and aims: Uptake of super(90)Sr and super(137)Cs in plants varies widely between soil types and between plant species. It is now recognized that the radionuclide uptake in plants is more influenced by site-specific and plant-specific parameters rather than the bulk radionuclide concentration in soil. We hypothesized that the stress which Alpine plants experience because of the short growing season may enhance the phylogenetic effect on the super(137)Cs and super(90)Sr transfer factors as well as the dependency of the uptake by plant to the concentrations of exchangeable Ca and K of soils. Methods: We carried out a field study on the super(90)Sr and super(137)Cs uptake by 11 species of Alpine plants growing on 6 undisturbed and geochemically different soils in the Alpine valley of Piora, Switzerland. Results: Results show that a strong correlation exists between the log TF and the log of exchangeable Ca or K of the soils. Conclusions: Cs uptake by Phleum rhaeticum (Poales) and Alchemilla xanthochlora (Rosales) is more sensitive to the amount of exchangeable K in the soil than the corresponding uptake by other orders. Moreover, the super(90)Sr results indicate a phylogenetic effect between Non-Eudicot and Eudicots: the order Poales (Phleum rhaeticum) concentrating much less super(90)Sr than Eudicots do.
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