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Published online 7 November 2005
Published in J Environ Qual 34:2167-2173 (2005)
DOI: 10.2134/jeq2004.0406
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Right arrow Biogeochemical Processes
Right arrow Lysimeter/Rhizosphere Studies
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Rhizospheric Mobilization and Plant Uptake of Radiocesium from Weathered Micas

I. Influence of Potassium Depletion

A. Gommersa, Y. Thirya,* and B. Delvauxb

a Radiation Protection Research Unit, Radioecology Section, SCK•CEN, Foundation of Public Utility, Boeretang 200, 2400 Mol, Belgium
b Unité Sciences du Sol, Université catholique de Louvain, Place Croix du Sud 2/10, 1348 Louvain-la-Neuve, Belgium



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  		Fig. 1. Schematic representation of the experimental cropping device.

 


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  		Fig. 2. Variation of potassium concentrations in the percolates of the different treatments (left: P0, P0.05, P0.1; right: P0.4, P2) during the experimental period.

 


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  		Fig. 3. Net biomass (dry weight) produced by willow under varying potassium supply.

 


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  		Fig. 4. Average total potassium content of plants (left) and radiocesium transfer factor (TF) (right) for each treatment.

 


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  		Fig. 5. Comparison between the amount of potassium removed from the nutrient solution percolating in the lysimeter column (K-solution) and the amount of potassium exported by willow plant in the different treatments (K-plant).

 


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  		Fig. 6. X-ray diffraction (XRD) patterns of the rhizosphere phlogopite at different levels of external K supply (from P0 to P2). The XRD pattern of bulk phlogopite as observed in the different treatments is presented for comparison. The intensity ratio of the 1.4- to 1.0-nm reflection (I1.4/I1.0) for rhizosphere phlogopite are 0.00 in P2, 0.15 in P0.4, 0.26 in P0.1, 0.33 in P0.05, and 0.30 in P0.

 




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