The study, which covers the period between 2014 and 2018, was carried out in the city of Naberezhnye Chelny, Republic of Tatarstan, Russia. The aim of the study was to examine the biochemical response of maple trees growing in the anthropogenic environments. Leaf samples from 600 trees ( Acer platanoides L. and Acer negundo L.) were collected at monthly intervals from June through August. Sampling was performed early in the morning (11 a.m.) in the middle of the month. The study offers statistical data on the tannin content, determined via permanganometry; the ascorbic acid concentration, found via titration with 2.6-dichlorophenolindophenol; the ascorbate oxidase activity determined by absorbance at 265 nm; and the polyphenol oxidase activity, found by the spectrophotometric method. Relatively higher ascorbate oxidase activity was detected in August among ash-leaved Acer platanoides L. and Acer negundo L. in areas with strong anthropogenic impact. Due to increased air pollution, maple trees were found to exhibit an increase of polyphenol oxidase activities. The condensed tannin content in Norway maple trees dropped over time: by 1.24 in July (avenue); by 0.94 (buffer area) and 0.76 (avenue) in August. The condensed tannin content in the ash-leaved maple trees also decreased: by 0.69 (buffer area) and 0.22 (avenue) in July; by 0.37 (buffer area) and 0.61(avenue) in August.

The helicopter borne time-domain VTEM system has been in constant development since 2002 through complex and multicomponent technical improvements in an effort to satisfy exploration and mining industry requirements. Progress in the geoelectrical informational level of data obtained with different VTEM systems is illustrated with the results of test surveys over the Caber VMS deposit. Forward plate modeling with different systems for the Caber deposit geometry target with changing conductance, as well as resistivity-depth transforms of the real data, both serve to illustrate significant broadening of the conductance aperture and increasing depth of investigation over time. Most of all the increasing sensitivity of the VTEM system is highlighted.

The results of studies of the characteristics of the biochemical composition of acutifolia in the conditions of a large industrial center of Naberezhnye Chelny (Republic of Tatarstan) are presented. Under condi-tions of intense technogenic load, the maple has a higher ascorbate oxidase activity at the initial stages of active vegetation and lower at the end of the vegetation. The content of ascorbic acid decreases during the growing season in man-made stands. Under conditions of a high content of pollutants in the air, acutifolia maple was distinguished by an increase in the activity of polyphenol oxidase as compared to control plantings. An increase in the activity of polyphenol oxidase is accompanied by a decrease in the content of tannins. In maple acutifolia, under the conditions of the most intense load of the main plantations, in July the peroxidase activity in the leaves is lower than in the ZAK plantations, and in August it is higher than in the control.

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.

The process of forest death covers the entire boreal zone of the Northern Hemisphere. Due to the deterioration of the sanitary condition of forest areas, harmful organisms are becoming more active, where the most dangerous pest is Ips typographus. The aim of the work was to study the chemical structure of spruce wood in samples of various living conditions in the zones of active reproduction of bark beetles.The research studies the biochemical composition of Píceao bovata wood within the places of Ips typographus development (bythe example of the Udmurt Republic). The research was carried out within the European part of the Russian Federation, the Udmurt Republic region. The republic area is 42 thousand km2. A total of 15 sample plots were laid out and more than 8,000 trees were analyzed. It was revealed that in the subtaiga zone, the processes of death of spruce stands are observed.