UDC

581.522:4:582.475.2:582.632

Authors

Kishchenko Ivan Tarasovich
Petrozavodsk State University Lenin ave., 33, Petrozavodsk, 185640, Russian Federation;
e-mail: botanika@psu.karelia.ru, ivanki@karelia.ru

Abstract

The studies were conducted in the Botanical Garden of Petrozavodsk State University, located on the northern shore of Petrozavodsk Bay of the Lake Onega (in the middle taiga subzone). Two species of Tilia were considered as the objects of the research: Tilia cordata Mill. and Amur linden Tilia amurensis Rupr. The growth of shoots and leaves of the studied species begins in May, and of Tilia cordata 3 days earlier than of Tilia amurensis. The shoot growth of Tilia amurensis stops 11 days earlier, but the leaves growth stops 19 days later than of Tilia cordata. The length of shoots of Tilia cordata (18.5 cm) is 3 times longer, and the leaf area is 1.5 times smaller (240 mm²) than of Tilia amurensis. The maximum daily growth of shoots of Tilia cordata (19.6 mm) is almost 4 times higher than that of Tilia amurensis. As for the leaves these differences are absent. The positive dependence of intensity of shoot growth and leaves on the dynamics of temperature and solar radiation is revealed. The development of the vegetative phase of Tilia cordata is faster than that of Tilia amurensis, indicating its greater adaptation to the new conditions of the area of introduction. The reason is that Tilia cordata needs much lesser amount of positive temperatures to start the growth of shoots and leaves than Tilia amurensis. Stopping the growth of these species is due to their photoperiod, the value of which is fixed genetically. The highest degree of promising introductions (71 points) is specific for Tilia cordata. This fact allows us to recommend it for landscaping work in the taiga zone.

Keywords

Tilia cordata, Tilia amurensis, introduced species in Karelia

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