Abstract
The influence of thallium (Tl) pollution on the activity of enzymes of carbon, nitrogen and phosphorus cycles in ordinary chernozem, brown forest soil and seropeski was studied. Thallium was introduced into the soil in the form of oxide (Tl2O3) and a solution of thallium nitrate (Tl(NO3)3) in 0.5, 1, 3, 10, 30 conditionally permissible concentrations. Incubation was carried out for 10 days. As a result of the study, it was found that contamination of the studied soils with Tl compounds leads to a decrease in the activity of enzymes involved in the carbon, nitrogen and phosphorus cycles. The change in enzyme activity depends on the chemical form (oxide or nitrate) of Tl and the concentration of the element in the soil. Phosphatase activity has the greatest sensitivity to contamination by thallium compounds. Ordinary chernozem showed the greatest resistance to thallium contamination, and seropeski showed the least.
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