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Research article - Peer-reviewed, 2010

The distribution of Cs-137, K, Rb and Cs in plants in a Sphagnum-dominated peatland in eastern central Sweden

Vinichuk, Mykhailo; Johanson, Karl Johan; Rydin, H.; Rosén, Klas


We record the distribution of Cs-137, K, Rb and Cs within individual Sphagnum plants (down to 20 cm depth) as well as Cs-137 in vascular plants growing on a peatland in eastern central Sweden. In Calluna vulgaris Cs-137 was mainly located within the green parts, whereas Andromeda polifolia. Eriophorum vaginatum and Vaccinium oxycoccos showed higher Cs-137 activity in roots. Carex rostrata and Menyanthes trifoliata showed variable distribution of Cs-137 within the plants. The patterns of Cs-137 activity concentration distribution as well as K, Rb and Cs concentrations within individual Sphagnum plants were rather similar and were usually highest in the capitula and/or in the subapical segments and lowest in the lower dead segments, which suggests continuous relocation of those elements to the actively growing apical part. The Cs-137 and K showed relatively weak correlations, especially in capitula and living green segments (0-10 cm) of the plant (r = 0.50). The strongest correlations were revealed between Cs-137 and Rb (r = 0.89), and between Cs-137 and stable Cs (r = 0.84). This suggests similarities between Cs-137 and Rb in uptake and relocation within the Sphagnum, but that Cs-137 differs from K. (C) 2009 Elsevier Ltd. All rights reserved.


Fen; Sphagnum; Uptake; Vascular plant

Published in

Journal of Environmental Radioactivity
2010, Volume: 101, number: 2, pages: 170-176