Abstract
The article provides data on phenology, on the content of ascorbic acid in Betula pendula Roth., growing in the conditions of the industrial city of Naberezhnye Chelny in the Republic of Tatarstan, which is a region of the Russian Federation. It is noted that natural phytocenoses are characterized by lower air temperatures in comparison with plantations of sanitary protection zones of industrial enterprises and highway plantings. According to phenological data, in urban plantings, there was observed an increase in defects, a decrease in the vital state, which is associated with severe damage to leaf blades, the formation of leaf necrosis, a decrease in the living area of leaves, which is a consequence of an intense technogenic load on woody plants. It was revealed that the content of ascorbic acid in birch leaves depends on the vegetation stage.
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