The effect of pollution with oil and oil products on the biological status of ordinary chernozems

The effect of pollution of an ordinary chernozem with oil and oil products depends on the nature and concentration of the pollutants, their distribution in the soil profile, and the period of the pollution. The soil contamination causes a rise in the number of microorganisms and changes in their species composition: a decrease in the diversity of micromycetes and an increase in the diversity of bacteria. In most cases, it inhibits the activity of soil enzymes. Oxidoreductases are more sensitive to oil pollution than hydrolases. The soil ecological functions are disturbed under the impact of contamination.