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  • Title: Seasonal variations in radionuclide transfer in a Mediterranean grazing-land ecosystem.
    Author: Baeza A, Paniagua J, Rufo M, Guillén J, Sterling A.
    Journal: J Environ Radioact; 2001; 55(3):283-302. PubMed ID: 11430676.
    Abstract:
    We made quarterly determinations of the transfer coefficients and effective transfer coefficients for the radionuclides 137Cs, 90Sr, 40K, 226Ra, 228Ra and 228Th over a full annual cycle, in a Mediterranean grazing-land ecosystem. The input and output fluxes of the radionuclides between the different compartments of this ecosystem were quantified for the following processes: root uptake; variation in root and aerial biomass; pasture production; translocation; leaf fall; efflux due to grazing action; resuspension and subsequent aerial deposition of radionuclides. We observed there to be a marked seasonal variation for this type of ecosystem in both the transfer coefficients and the radionuclide fluxes, which impedes the soil-plant transfer being characterized on the basis of values that are constant with time.
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