Soil algocyanoflora specificity under anthropogenic pressure

Algocyanoflora is an important component of soil microbiota. Anthopogenic pressure causes considerable transformation of natural microbiological communities. Thus there are certain negative consequences. We compare the microphototroph species content in soils differ in the character of the anthropogenic pressure: site 1 – nature reserve soils; site 2 – technogenic soils; site 3 – soils used in agricultural holdings, farms. As a result the richest microphototrophic species composition was in nature reserve soils. Soil management and heavy fertilizing with swine manure slurry decreased microphototrophic biodiversity by 30%. Technogenic pressure decreased biodiversity almost by 50%. Leptolyngbya angustissima, Nostoc punctiforme (Cyanobacteria), Chlamydomonas gloeogama, Ch. minutissima, Chlorococcum infusionum, Chlorella vulgaris, Chloroplana terricola, Klebsormidium flaccidum, Kl. nitens (Chlorophyta), and Hantzschia amphioxys (Bacillariophyta) are the most tolerant to anthropogenic pressure. Ochrophyte microalgae species are the least tolerant to anthropogenic pressure, while green algae are most tolerant ones. Technogenic factor greatly affects the soil microphototrophic communities. At the technogenically stressed site microphototroph species diversity is almost two times lower compared to the control site (nature reserve). The microphototroph biodiversity in nutrient-rich agrozems is just a bit less than in nature reserve (35 and 49 spesies, respectively). Algoindiaction according to algae and cyanobacteria communities is an informative and sensitive quick-test in assessing the soil status. Changes in the species composition and aboudance of microphototrophs are a response to changes in environmental conditions.