UDC

582.475.2:581.52

Authors

Ivan T. Kishchenko*
*Petrozavodsk State University (Petrozavodsk, Russian Federation)

Abstract

The paper presents the results of the studies carried out in 1986–2012 in the Botanic Garden of Petrozavodsk State University (South Karelia, middle taiga subzone). Objects of research were three types of introduced species Padus Mill.: Prunus Maak (P. maackii (Rupr.) Kom.), Prunus virginiana (P. virginiana (L.) Mill.), Prunus pensylvanica (P. pensylvanica (L. f.) Sok.). Phenological observations were conducted every 3 days. A phenophase was deemed to have occurred if it is marked by at least 30 % of the shoots of all investigated species. The studied species Padus Mill. can be divided into 2 groups according to the features of the seasonal development rhythm: species early starting and early finishing the development of the vegetative sphere (P. maackii), and species late starting and late finishing the development of the vegetative sphere (P. pensylvanica, P. virginiana). Among the environmental factors the air temperature has the most significant impact on the development dynamics of species Padus in terms of South Karelia. The direction and strength of this effect are based on a plant species and phenophase specificity. The daily average air humidity affects the timing of phenophases of studied species quite low. Air humidity has a moderate positive impact only on the finishing phases of shoot growth and their lignification, end of flowering and fruit setting (r = + 0.5 ... + 0.6). All studied introduced species Padus are highly promising for introduction (84–99 points), and can be successfully applied in landscaping works. The findings suggest to consider the species P. maackii as the most adapted to the new conditions and therefore promising for the introduction in South Karelia.

Keywords

development of introduced species, Padus, phenological observation, South Karelia

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