Monitoring of algocyanobacterial communities on the technogenic territory

The paper considers soil phototrophic microorganisms communities which develop on substrates different in composition and properties and used for filling the pond of liquid chemical tailings. Algocyanofloral species composition depends on the properties of soils, the site relief, the degree of substrate contamination, and the degree of higher plant development. On the monitoring sites 63 species of soil microphototrophs were found; as for the number of species, cyanobacteria (CB) prevail, green algae species are the second in number. Only a few species of yellow-green and eustigmatophyte algae were found. Especially scarce species diversity is characteristic of gypsum scum. Gypsum weathering leads to growth of the number of species. For three years algocyanofloral species diversity on the level ground with sandy-loam substrate and short projective cover with higher vegetation has changed from 17 to 32 species. In micro-relief lowering with a similar granulometric soil composition, with lower alkalinity and a greater amount of coarse organic matter under the association of reed (Phragmites communis) 27 species were found, with absolute dominance of hydrophilous CB species. On two monitoring sites with gramineous association development (Calamagrostis epigeios (L.) Roth, Agropyron repens Beauv.) species diversity has drastically reduced. The diatomic alga Hantzschia amphioxys was stated among the dominating species, its adherence to sod grasses is conditioned by its need in the sufficient amount of silicon which is a constituent part of diatom frustules. Mild contamination of soils which are being formed on fill-up grounds shows itself in either a small amount or absence of species sensitive to contamination (in particular, of unicellular Xanthophyta) on the monitoring sites.