Rates of 137Cs leaching by various crop plants

S. M. Pakshina, N. M. Belous, V. F. Shapovalov, E. V. Smolskiy, D. M. Sitnov

Abstract


We studied the main reasons caused the agricultural crop variety regards 137Cs uptake and translocation from the soil. The cereal grains - oats (Avena sativa L.), Sudan grass (Sorghum vulgare L.), and millet seed (Panicum milaceum L.); grain legume – yellow lupine (Lupinus luteus L.), and fodder crop - annual ryegrass (Lutium multiflorum Lam) were considered in our research. The transpiration, transpiration coefficient, relative transpiration, multiplicity of decrease in the specific activity of 137Cs in phytomass towards experimental variants and control, the intensity of the bioleaching process of 137Cs, the specific surfaces of rhizosphere, the rhizosphere surface density of root charges, and constants of roots and soil ion conductivity were used to calculate the 137Cs leaching from the soil by different crops. We used special model that considered the effect of double electrostatic fields of the rhizosphere and soil on the ion flux to calculate the 137Cs bioleaching from the soil by various crops. We suggested that the conductivity of the root-soil interface was the main reason of specific variation in the 137Cs leaching from the soil. We ranged the studied crops according to the decrease of 137Cs leaching from sod-podzolic sandy soil: yellow lupine, sultan grass – oats seed – millet seed – perennial ryegrass.


Keywords


bioleaching model; 137Cs; rhizosphere; specific surface; surface charge density; bioleaching intensity; soil and rhizosphere electrical conductivity

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DOI: http://dx.doi.org/10.15421/2017_35

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