Changes in the complex of heterotrophic microorganisms in soddy-podzolic soil polluted by lead

摘要

Artificial pollution of soddy-podzolic soil by lead (>500 mg Pb/kg soil) caused a decrease in the species diversity of soil micromycetes and streptomycetes and in the population density of azotobacter, replacement of dominant species participating in decomposition of different substrates, and an increase in the abundance of phytotoxic micromycetes. The bacteria of genus Bacillus demonstrated a high resistance to soil contamination by lead. High concentrations of lead were even found in the topsoil layer 15 years after the pollution.