Accumulation of 90Sr by Plants of Different Taxonomic Groups from the Soils at the East Ural Radioactive Trace
The East Ural Radioactive Trace (EURT) is a result of the accident at the “Mayak” Production Association (PA) in 1957 (the so-called Kyshtym accident). Among the long-lived radionuclides, 90Sr was the primary emission contaminant at the time of the accident. At present, the density of soil contamination within the EURT varies over a wide range (10–70,000 kBq m−2); the spatial distribution of 90Sr with increasing distance from the epicenter of the accident is satisfactorily approximated by an exponential function. The essential amount of this radionuclide is located in the 15–20-cm layer of the soil. We estimated the content of 90Sr in plants growing at sites with different levels of soil contamination. The densities of soil contamination mainly determined the absorption of 90Sr by plants.
We investigated 90Sr accumulation by plants of major taxonomic groups, which included tree species, herbaceous plants, mosses and lichens. The results showed that the maximum concentrations of 90Sr were found in surface mosses and in the leaves of woody plants; the large branches of trees, herbaceous plants and epiphytic lichens accumulated 2–4 times less 90Sr, and the content of 90Sr in fungi was minimal. We evaluated the contribution of the species specificity of herbaceous plants to 90Sr accumulation using the Fabaceae family as an example. The variability of the accumulation capacity of most species of this family was small.
Keywords90Sr Transition coefficient East ural radioactive trace Kyshtym accident Plants Radionuclide accumulation Soils Taxonomic groups
This research was carried out partially with financial support from Program of Basic Scientific Researches at Ural Branch of RAS, project No 15-2-4-21.
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