Micro arthropods population reduced with increase in the amount of oil in chernozem. The same pattern was observed up to a certain concentration of lead in the soil (background + 250 mg kg-1) and then at high doses (+500 and +1000 mg kg-1) an increase in microarthropods abundance was recorded. Gamazid mites and acaroid-trombidi form complex mites proved to be more resistant to contamination with lead and on the contrary armored mites and springtails proved to be more resistant to contamination with oil.
