[Influence of chemical pollutants on stability of forest soil microbiocenoses (natural model experiments)].

The influence of different concentrations (10, 30, 50, 100, 150, 300) of the maximum permissible concentrations of fluoride and sulfide pollutants (Na2SO4, NaF and Na2SO3 + NaF) on highly buffered soils of larch forest of Pogorelskii pine wood in Krasnoyarsk forest-steppe was studied. As a result of the influence of treatment with high concentrations of fluoride and sulfide compounds, the intensity of respiration of microorganisms and values of the microbe metabolic coefficient increased, and the biomass of microorganisms and enzymatic activity decreased compared to the control by 1.3-2.7 times. By the end of vegetation, the ecophysiological condition of microbiocenoses of the studied regions had stabilized.

[Microbial polymers as a degradable carrier for pesticide delivery].

The possibility of use of polyhydroxyalkanoates (PHAs), biodegradable microbial polyesters, as a carrier for pesticides (alpha-hexachlorocyclohexane and lindane) for targeted and controlled delivery of these compounds to soil was investigated. The kinetics of polymer degradation and the dynamics of pesticide release from the extended-release formulations was studied. It is shown that pesticides embedded in a degradable polymer (PHA) carrier are released gradually and slowly, without surges, as the polymer is degraded by the soil microflora. The microbial soil component actively responded to the addition of the polymer as an additional nutrient substrate: the latter was degraded and then utilized. The rate of the pesticide release to the soil can be regulated by varying the polymer-pesticide ratio.

[Evaluation of soil microbial communities in two types of Siberian forest ecosystems].

Microbial respiration and biomass were evaluated in soils of the Ermak Tree Nursery and Pogorel'skii Forest under different coniferous species. The degree of disturbance of each biocenosis was determined from the metabolic coefficient (qCO2). The microbial investigation demonstrated a lower resistance to ecological factors of the tree nursery biocenosis as compared to those of the Pogorel'skii Forest.

[Use of micromycetes Trichoderma for soil bioremediation in tree nurseries].

Data were obtained on the improvement of soil microbiocenoses in artificial ecosystems after the introduction of micromycetes Trichoderma. Application of biologically active substances released by some of aboriginal microbial strains can solve bioremediation problems in a given region at a low cost.