Поглощение радиоактивных и стабильных изотопов Со и Zn растениями ячменя при смешанном радиоактивном и химическом загрязнении почв
2010
Kruglov, S.V. | Lavrent'eva, G.V. | Pivovarova, Yu.A. | Anisimov, V.S., All-Russia Research and Development Inst. of Agricultural Radiology and Agroecology, Kaluga Region (Russian Federation)
A root uptake of heavy metals (stable and radioactive isotopes of Co and Zn) by barley plants was studied in the conditions of soil pollution. Samples of podzol (PZ) and chernozem (CZ) soils from arable layers had combined radioactive (Co-60 and Zn-65) and chemical pollution. Seven doses of heavy metals from 0 to 500-750 mg/kg of soil were used at indoor experiments. In the samples the content of alphitite was 23 and 42%, humus – 1.7 and 4.7%, the capacity of exchangeable cations - 9.3 and 34.3 mg-eq/100g, respectively. The control is the variant with radionuclide entering the soil against the background of natural content of metals. In the experiments with PZ soils the concentration of heavy metals was determined in 14-day-old plantlets and adult plants, in the experiments with CZ - in 14-day-old plantlets only. The uptake of Co-60 increased at increasing of the total content in the soil. In the 14-day-old plantlets the concentration did nonlinearly at raising of soil pollution by stable isotopes of Co. In contrast the uptake of Zn-65 lowered at raising of PZ soil pollution by Zn-65. It was concluded that under combined soil contamination by radioactive and stable isotopes Co and Zn the transition of radioactive isotopes into plants was determined by a value of the mobile reserve of stable isotope in soil and a capability of the solid soil phase of giving the ions into a soil solution, as well by a requirement of plants in the studied elements and by absorption intensity of the ions by roots from the solution.
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