Influence of the main physiological groups of microorganisms on the bioavailability of ¹³⁷Cs and its entry from peaty-gley soil into the biomass of Avena sativa L.

The influence of the main physiological groups of soil microorganisms on transfer of ¹³⁷Cs from the peaty-gley soil into the biomass of oats (Avena sativa L.) are analyzed in the article. The soil contaminated with radioisotopes after the Chernobyl nuclear power plant accident. The impact of these groups of microorganisms on the content of stable isotopes K, Ca, Sr, Cs in bioavailable forms in the soil are is presented as well. 1 It was established that the introduction of phosphate-mobilizing bacteria and spore-forming ammonifiers into peaty-gley soil did not change the level of ¹³⁷Cs accumulation in the aboveground biomass of oats. However, both groups of soil microorganisms significantly (by 44‒84 %) increase the content of radioactive and stable isotopes of cesium in water-soluble form in the soil.

Against this background, the introduction of phosphate-mobilizing bacteria into peaty-gley soil reduces the accumulation of radionuclide in the roots of the plant by 30.5 %. The absence of increased accumulation of ¹³⁷Cs in oats with increase in the content of radionuclide in water-soluble form is explained primarily by an increase in the content of К in bioavailable form in peaty-gley soil when phosphate-mobilizing bacteria and spore-forming ammonifiers are added to it.

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