UDC

582.477.2:581.522.4

Authors

Kishchenko Ivan Tarasovich
Petrozavodsk State University
Lenin ave, 33, Petrozavodsk, 185640, Russian Federation;
e-mail: ivanki@karelia.ru, botanika@psu.karelia.ru
Kravtsova Alisa Denisovna
Petrozavodsk State University
Lenin ave, 33, Petrozavodsk, 185640, Russian Federation;
е-mail: alisa.kravtcova@gmail.com, botanika@psu.karelia.ru

Abstract

Many species of the family Cupressaceae F. M. Neger. tolerate well the environmental pollution. Therefore, their introduction into the cities is very important. The aim of the study was to investigate the characteristics of growth and development of plants Thuja occidentalis L., growing in relatively clean environments (Botanical garden of Petrozavodsk State University) and in the urban environment (Petrozavodsk) (middle taiga subzone). The starting and the end time of growth of Thuja occidentalis plant shoots in the Botanical garden and in the city practically have no difference. Therefore, the duration of formation of plant shoots in clean and urban environment remains the same – 69–70 days. The length of the mature plant shoots growing in the Botanical garden was of 10 % higher than of the plants in the city. Meanwhile, all phenophases begin and end earlier in the plants growing in a relatively clean environment of the Botanical garden than in the plants in polluted urban environments. Air humidity and precipitation affect more on the growth of shoots in the city than in the Botanical garden. The dynamics of the solar radiation is weakly reflected in the growth of the plant shoots of T. occidentalis in both studied groups. The plants in the city have the higher indicators of winter hardiness and the regularity of growth of shoots than the plants in the Botanical garden. But the capacity for generative development and the propagation of plants in the city are reduced. Estimation of prospects of plants introduction (67–76 points) allows us to range T. occidentalis, growing in clean and contaminated conditions in the 2 perspective class – “deserving plants“. Thus, T. occidentalis is well adapted to the contaminated environment, and must be widely used for urban greening.

Keywords

seasonal growth, plant development, middle taiga, Thuja occidentalis, introduction of species

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