RESEARCH OF THE STATE OF WOODY AND BRUSHWOOD PLANTS UNDER ANTHROPOGENIC STRESS CONDITIONS

Objective. The study of anthropogenic impact on environmental components, primarily on woody and shrub plants, which are the main medium-forming element in natural and artificial ecosystems, is relevant. The subject of this study was the ecological and biological state of plants under conditions of technogenic stress. Materials and methods. The article presents the results of a study of the life state of woody plants. For this, test plots were laid on the territory of sanitary protection zones of industrial enterprises and in the plantings of main plantings. The quantitative content of tannins and polyphenol oxidase in plant leaves during the active growing season was determined by spectrophotometry and titrimetric analysis. Results. Vitality decreases in the following order: Betula pendula Roth.> Sorbus aucuparia L.> Rosa majalis Herrn.> Acer negundo L.> Tilia cordata Mill. In plantations of technogenic territories, an increase in damage to the leaf blade is noted, a greater number of dry branches appear in the crown of a tree, compared to the control zone. Thus, in the study area, the lowest life state scores were recorded in Tilia cordata Mill., And the highest vital state scores were recorded in silver birch. In mountain ash, wild rose and American maple, the vital state is average. The increase in the activity of polyphenol oxidase was observed in plantations of technogenic territories, which is a consequence of intensive anthropogenic load on woody plants. Increased activity of polyphenol oxidase helps to decrease the content of tannins in plant leaves. Betula pendula Roth. Sorbus aucuparia L. in the SPZ of industrial enterprises in July, the accumulation of tannins is more intense than in the control plantations. Conclusion. Betula pendula Roth., Sorbus aucuparia L. in the SPZ of industrial enterprises in July, the accumulation of tannins is more intense than in the control plantations. Spectrophotometric determination of activity helps to understand the reasons why the content of tannins increases or decreases. This fact indicates the participation of tannins in the complex of adaptive reactions of plants, which are associated with protection from aerogenic pollutants. As a result of the study, the most resistant to anthropogenic stress plant species were identified: silver birch, cinnamon rose, and rowan tree.