Мониторинг почвенной альгоцианофлоры на техногенной территории

Abstract

The results of monitoring higher vegetation and soil algocyanoflora on the territory of the self-overgrowing liquid waste storage facility after reclamation are presented. The species composition of higher plants and algocyanoflora on monitoring sites depends on the whole complex of soil formation factors: the initial heterogeneity of the substrate, topography, and moisture conditions. Reduced relief and excessive moisture contribute to development of moisture-loving species of higher plants, algae and cyanobacteria; the density of grass sod exacerbates the competitive relations of higher plants (monodominance) and contributes to decrease in the species diversity of microphototrophs. For the entire observation period from 2019 to 2022 66 species were identified on the territory of the backfilled tailing dump including: Cyanobacteria – 29; Chlorophyta – 20; Xanthophyta – 5; Eustigmatophyta – 3; Bacillariophyta – 9. Cyanobacteria (CB) dominate the algocyanoflora communities at all sites accounting for 43–47% of the species diversity. Few species of yellow-green and eustigmatophyte algae sensitive to technogenic pollution have been noted. The research did not reveal any regular relationship between soil pollution, vegetation species diversity and algocyanoflora composition. However, it can be assumed that the increased content of nitrates in soils in the low area under reed thickets may be the reason for the low species diversity of CB. Over time, increasing similarity of algocyanoflora on the monitoring sites was noted. The maximum difference in the species composition of algae and CB identified on the site under the monoassociation of common reed is conditioned by excessive soil moisture in the lowering of the relief.