Abstract

This study presents the results of a model experiment with Picea abies determining the role of root exudates in the intake of radiocaesium into soil solution. It has been established that the amount of consumed 137Cs depends on the weight of the root system, with the majority of the radionuclide presumably accumulating in the primary cortex of the root; i.e., it was not redistributed further between the structural components of the plant. The amount of 137Cs entering the aerial part is approximately 2.5% of its total storage in the plant. During the experiment (7 days), 37.4–53.8% of the radionuclide accumulated in the assimilating organs were transported into pure solution with root exudates and the radiocaesium storage transported into the solution exceeded that of the roots. The movement of 137Cs in the aqueous film on the surface of the root systems have not been recorded.

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