Predicting radiocaesium root uptake based on potassium uptake parameters. A mechanistic approach

This paper describes the application of a mechanistic model in the study of radionuclide soil-plant transfer and the obtainment of predictive estimates of radionuclide plant contamination. Soil-plant K and ¹³⁴Cs transfer rates were measured and compared with those predicted by the Barber-Cushman mod...

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Bibliographic Details
Published in:Plant and soil 2000-01, Vol.222 (1/2), p.35-49
Main Authors: Jove, M C, Roca, Calzada, V R, Vallejo
Format: Article
Language:English
Subjects:
Absorption
Absorption. Translocation of ions and substances. Permeability
Agronomy. Soil science and plant productions
Biological and medical sciences
Economic plant physiology
Fructification
Fundamental and applied biological sciences. Psychology
Modeling
Non agrochemicals pollutants
Nutrition. Photosynthesis. Respiration. Metabolism
Phytopathology. Animal pests. Plant and forest protection
Plant physiology and development
Plant roots
Plants
Pollution effects and side effects of agrochemicals on crop plants and forest trees. Other anthropogenic factors
Pollution effects. Side effects of agrochemicals
Potassium
Radioisotopes
Seedlings
Soil pollution
Soil samples
Soil solution
Soil types
Soil water
Soils
Water and solutes. Absorption, translocation and permeability
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Summary:This paper describes the application of a mechanistic model in the study of radionuclide soil-plant transfer and the obtainment of predictive estimates of radionuclide plant contamination. Soil-plant K and ¹³⁴Cs transfer rates were measured and compared with those predicted by the Barber-Cushman model. The experiment was performed on pea plants grown in pots and in two different types of soil (Calcic Luvisol and Fluvisol). For K, model predictions proved valid for all development stages sampled; for ¹³⁴Cs, the quality of the prediction depended on the plant stage. In both, parameter estimates varied depending on plant age and soil type. The model was also run for ¹³⁴Cs using the Michaelis-Menten parameters obtained for K. In this case, the predicted values were significantly correlated with those measured, but about three times higher. Thus, a positive plant discrimination of K versus ¹³⁴Cs in plant absorption is observed for the types of soil studied. As regression proved to be significant, K absorption rates may be used to estimate ¹³⁴Cs absorption in determining radiocaesium plant uptake.
ISSN:0032-079X
1573-5036
DOI:10.1023/A:1004719711931