PLANT BIODIVERSITY CHANGES AT THE TERRITORY OF ELECTRIC MAINS IN THE BOUNDARIES OF THE REGIONAL RESERVE "UPOROVSKIY"
This article presents the results of assessing the biodiversity of natural and anthropogenic ecosystems (power lines) of the regional reserve «Uporovsky» territory (Uporovsky district, Tyumen region). Analysis of the identified floristic composition shows the affiliation of the plant communities of the investigated area to forest formations of the taiga natural zone. The expansion of power lines network is associated with an increasing multi-factor impact on natural ecosystems. It was revealed that the flora of the studied area of the reserve's territory within the transect includes 112 species of vascular plants, combined into 24 families, 46 species of which were found on site E1 (natural), 29 species – on site A2 (anthropogenic), the remaining 37 species were common to both sites. The degree of participation of certain species in the herbage was determined by taking into account their relative abundance. We used the Drude scale, in which different degrees of abundance are indicated by points based on the values of the smallest distances between individuals of the species and their occurrence. When conducting power lines on the territory of the allotment, the biodiversity of the flora decreases due to the loss of a number of species. Due to the violation of the indigenous communities integrity in the area of the power line distribution line, synanthropic species settle, forming ruderal associations with the dominant species Vicia sepium L., Polygonum aviculare L., Cirsium vulgare (Savi) Ten. The abundance of species in indigenous communities in the right of way decreases. A number of species, primarily light-loving, oppressed in indigenous communities, in open areas of the right of way, increase their abundance in the following ways: solitaries → sparsae; solitaries → copiosa; sparsae → copiosa.