Volume 37, Number C1, February 2002ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments
|Page(s)||C1-415 - C1-419|
|Published online||14 October 2009|
137Cs content and distribution in understorey spruces
Radiation and Nuclear Safety Authority (STUK), Research and Environmental Surveillance, P.O. Box 14, 00881 Helsinki, Finland
Understorey spruces (Picea abies) grown after the Chernobyl accident were studied in Finland in 1998. Ten trees were sampled from three pine forests on unmanaged mineral soil. 137Cs contamination of the ground, estimated from soil samples, varied from 24 to 66 kBq m-2. Contents and distributions of 137Cs and dry matter were compared by trees of varying age and size. Stemwood contained 19-36 % of the dry mass but only 4-7 % of the radiocaesium. Needles contained 21-48 % of the dry mass and 37-60 % of the 137Cs. Roots contributed to the dry mass more than to the 137Cs content of a tree. Activity concentrations in needles and branches were highest in current year growth, and in upper parts of the trees. Also wood and bark had higher 137Cs concentration in upper parts of the stems than in lower parts. Concentrations per unit deposition (m2 kg-1 dry weight) were calculated for comparison of uptake by trees from different sites. They varied by the stage of growth in several tree parts. For instance, in current year needles they were on average 0.098 for older trees and 0.13 m2 kg-1 for younger trees.
© EDP Sciences, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.