Assessment of medium quality by fluctuating asymmetry of Betula pendula Roth., Padus avium Mill. and Crataegus sanguinea Pall. in the floodplain of the Karatuz river (Krasnoyarsk region)

The assessment of the state of atmospheric air quality is presented with the use of indicators of fluctuating asymmetry of Betula pendula, Padus avium and Crataegus sanduinea sheet plastics. The study was carried out at the junction of the Western spurs of the Eastern Sayan and Minusinsk basin between the rivers Sissim, Syda and their tributaries. Leaf samples were taken from four sites. Leaf collection was carried out at the end of the growing season in 2017, during the stop of leaf growth by the method of V. M. Zakharov (2000). The sample of leaves from one site is 30 pieces, a total of 120 leaves are processed. The results were processed according to the method of S. I. Marchenko (2008). The indicator "width of the left and right halves of the leaf" is variable according to the results of the study. The size of the left and right halves of the leaves varies in Crataegus sanguinea within 0.65 mm, for Betula pendula the width of the leaf blades varies in the range of 0.45 mm, for Padus avium the width of the leaf blades varies by 0.15 mm. the Sample from the forest is characterized by low integral indices of asymmetry. The nature of environmental quality is characterized as an initial deviation from the norm. Pesticides and carbon dioxide emissions from vehicles are likely to be stress factors for the environment in the study area. The ecological condition of the natural area is characterized on average as satisfactory.