Home – Home – Jornals – Siberian Journal of Forest Science 2022 number 6

The article presents for the first time data on the composition and structure of algae groupings in gray forest soils of the town of Usolʼe-Sibirskoe and its surrounding territories, exposed to technogenic pollution. Samples from 19 locations, mainly forest stands, located on the territory of the town (12 locations) and its surroundings (7 locations) were studied. Using culture-dependent methods, 77 species from five divisions of Cyanoprokaryota (22 % of the total number of species), Bacillariophyta (5 %), Ochrophyta (9 %), green algae (Chlorophyta) (61 %), Charophyta (3 %) were registered. The largest number of species are represented by green algae, which is typical for forest soils. A variety of Cyanoprokaryota species was noted in the soils of the town, which are characterized by lower acidity, increased content of exchangeable calcium, sodium, sulfur, and a lower content of total nitrogen compared to the background. In the studied forest stands on the territory of the town, the diversity of algae groupings was higher (the average number of species was 11.7) than in its surroundings (an average of 9.9 species). Composition and structure of algogroups of the studied forest soils of Usolʼe-Sibirskoe testifies to their preservation of common features characteristic of such soils of natural biogeocenoses. According to the number of species, the distribution of species in the departments, the soil algocomplex of forest stands in the town of Usolʼe-Sibirskoe and its surrounding territories is similar to those of other industrial centers of Irkutsk Oblast: Sayansk, Shelekhov, and Irkutsk.