Plant uptake of radiocaesium from artificially contaminated soil monoliths covering major European soil types

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• 作者：Nadia Waegeneers ; Teresa Sauras-Yera ; Yves Thiry ; V. Ramó ; n Vallejo ; Erik Smolders ; Chantal Madoz-Esc ; e ; Franç ; ois Bré ; chignac
• 关键词：Radiocaesium ; Potassium ; Soil-to-plant transfer ; Soil solution ; Undisturbed soil monoliths
• 刊名：Journal of Environmental Radioactivity
• 出版年：2009
• 出版时间：June 2009
• 年：2009
• 卷：100
• 期：6
• 页码：439-444
• 全文大小：206 K

文摘

Uptake of ¹³⁷Cs was measured in different agricultural plant species (beans, lettuce, barley and ryegrass) grown in 5 undisturbed soil monoliths covering major European soil types. The first cultivation was made three years after soil contamination and plants were grown during 3 successive years. The plant–soil ¹³⁷Cs transfer factors varied maximally 12-fold among soils and 35-fold among species when grown on the same soil. Single correlations between transfer factors and soil properties were found, but they varied widely with plant type and can hardly be used as a predictive tool because of the few soils used. The variation of ¹³⁷Cs concentrations in plants among soils was related to differences in soil solution ¹³⁷Cs and K concentrations, consistent with previous observations in hydroponics and pot trials. Absolute values of transfer factors could not be predicted based on a model validated for pot trials. The ¹³⁷Cs activity concentration in soil solution decreased significantly (11- to 250-fold) for most soils in the 1997–1999 period and is partly explained by decreasing K in soil solution. Transfer factors of lettuce showed both increasing and decreasing trends between 2 consecutive years depending on soil type. The trends could be explained by the variation in ¹³⁷Cs and K concentrations in soil solution. It is concluded that differences in ¹³⁷Cs transfer factors among soils and trends in transfer factors as a function of time can be explained from soil solution composition, as shown previously for pot trials, although absolute values of transfer factors could not be predicted.