[Microscopic soil fungi - bioindicators organisms contaminated soil].

In the paper there are considered methodological issues for the evaluation of soil biota in terms of oil pollution. Experimental studies have shown that under the exposure of a various levels of oil pollution meeting certain gradations of the state and optimal alteration in microbocenosis in sod-podzolic soils, there is occurred a transformation of structure of the complex of micromycetes and the accumulation of toxic species, hardly typical for podzolic soils - primarily represantatives of the genus Aspergillus (A.niger and A.

[Hygienic evaluation of the effect of petroleum hydrocarbons on the soils of megapolises].

The paper gives the results of studying the quantity of petroleum hydrocarbons in the Moscow soil, as well as the latter's hygienic evaluation by the changes in acidity (pH) and redox potential and by the sanitary state (the levels of Escherichia coli and viable helminthic eggs). The study has ascertained that the petroleum-polluted soils show changes in medium pH and redox conditions that determine the biological activity of the substances and the trend in their disintegration processes and revealed a relationship of thy sanitary state of Moscow soils to their level of petroleum hydrocarbons.