Ключевое слово: «heavy metals»

This article presents the results of studies of fluctuating asymmetry and chemical composition of poplar leaves Populus nigra L. in Sibai. The city is a major industrial center for the extraction and processing of copper-pyrite ores in the Trans-Urals of the Republic of Bashkortostan. Bioindication methods are used to assess the ecological state of the studied territory. In the course of the conducted studies, it was found that the average value of the fluctuating asymmetry characterizes the strong, extreme pollution of the Sibai environment. The content of chemical elements in poplar leaves exceeds regulation on maximum permissible limits by several times, with the exception of nickel and cadmium. According to V.V. Dobrovolsky, the concentrations of heavy metals are many times higher than in Clark plants. The ecological state of the city is characterized as an ecological catastrophe and an ecological crisis. The data obtained can be used in conducting comprehensive monitoring studies of urbanized territories.