Volume 37, Number C1, February 2002ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments
|C1-31 - C1-36
|14 October 2009
General process, dynamics and modelling of radiocaesium cycling in contaminated forest: A whole-ecosystem approach
CEN-SCK, Radiation Protection Research Department, Boeretang 200, 2400 Mol, Belgium
We used a chronosequence approach to compare the distribution of 137Cs and potassium (K) in the different compartments of three Scots pine stands. The cycling dynamic of both element was assessed as a function of stand development with emphasis on 137Cs immobilisation in wood. 137Cs and K redistribute rather similarly between tree components, by circulating through the same pathways. 137Cs immobilization in wood is, however, more important than for K, especially in old stands. Although the old stand accumulated more 137Cs from the Chernobyl event than the young stand, a much less limited pool of 137Cs characterises its current annual cycling when compared to K. Differences in the current 137Cs content between young and old stands most likely reflect divergences occurred during the early redistribution rates after the fallout connected with differences in 137Cs interception rate. The WIP approach (combining 137Cs radial pattern and biomass increment) was then preferred to the TF coefficient concept to quantify the actual 137Cs immobilization in wood of each stand due to root uptake. Independently of the stand age, higher WIP values were related with the higher bio-availability of the 137Cs located in organic layers.
© EDP Sciences, 2002
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