Volume 37, Numéro C1, February 2002ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments
|Page(s)||C1-565 - C1-568|
|Publié en ligne||14 octobre 2009|
137Cs and 90Sr root uptake of pine saplings in a managed forest
STUK, Radiation and Nuclear Safety Authority, Research and Environmental Surveillance, P.O. Box 14, 00881 Helsinki, Finland
2 Finnish Forest Research Institute, METLA, Parkano Forest Research Station, Kaironiementie 52, 39700 Parkano, Finland
Effects of liming (4000 kg calcium-magnesium carbonate per hectare) and soil preparation (with a disc plow) on 137C sand Sr uptake of pine saplings (Pinus sylvestris) were studied in a dry heath forest in western Finland. Four treatments were studied: liming, soil preparation, liming followed by soil preparation, and control. The trees were planted in 1987 ; one year after the soil management, on a site contaminated by Chernobyl derived 137Cs. Sampling of various tree parts and soil was carried out in 1991. Soil preparation increased highly significantly dry mass of the whole tree and branches and needles of C and C+1 year classes, and significantly masses of roots, stem, and older branches and needles. In all these fractions the content of Sr increased significantly. The 137Cs concentrations in all tree fractions were highest in samples from the control plots, but Sr differed from this pattern. Soil preparation decreased significantly the 137Cs concentrations in roots and living needles. The changes in 137Cs and Sr contents in trees may partially be traced back to increased nutrient mobility and root mass and changed root distribution in soil, and also to different relations of Cs-K and Sr-Ca in uptake and translocation processes of trees.
© EDP Sciences, 2002
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