Effect of Contamination with Heavy Metals and Oil on the Biological Properties of Leached Vertic Chernozem

摘要

It was found that the contamination of vertic chernozem with Cr, Cu, Ni, Pb, and oil resulted in a decrease in the number of bacteria of the genus Azotobacter; the activity of catalase, dehydrogenase, and dehydrogenase; and cellulylotic capacity and an increase in the phytotoxicity of soil. It was concluded that heavy metals form the following series in accordance with their negative effect: Cr > Pb >= Cu >= Ni. Regional norms were proposed for the contents of Cr, Cu, Ni, Pb, and oil in vertic chemozems.