UDC

582.475.2:581.522

Authors

Ivan T. Kishchenko*, Elena S. Ol’khina**
*Petrozavodsk State University (Petrozavodsk, Russian Federation)
**Petrozavodsk Forestry Technical School (Petrozavodsk, Russian Federation)
Corresponding author: Ivan Kishchenko, address: prosp. Lenina, 33, Petrozavodsk, Republic of Karelia, 185640, Russian Federation; e-mail: ivanki@karelia.ru, botanika@psu.karelia.ru

Abstract

The paper presents the studies of peculiarities of growth processes of P. abies trees in 2001–2006 in the city (urban environment) and suburban forests (adjacent to the city boundaries, recreational impact). The undisturbed stands located 5 km to the south of Petrozavodsk (forest green zones) served as control. The objects of research in the suburban forests and forests of the green zone were the maturing (70–90 years old) communities of a sorrel spruce forest, a bilberry scrub forest, a spruce grove near the brook, and a grass spruce forest, pure in composition. Phenological observations were carried out every 3 days. The phenophase was considered to have occurred if it was observed in no less than 30 % of shoots of all species of record trees in certain growing conditions. The studies established that the sequence in the passage of P. abies phenological stages in the urbanized environment and in undisturbed forest stands did not differ. The phenodate variability by years in urban environment was 1.5–1.8 times higher than in suburban forests. The greatest stability of the phenophase occurrence was characteristic for P. abies in the forests of the green zone. The phenophases occurrence time of P. abies under various growth conditions depended largely on the current air temperature regime, as well as the air temperature for the several preceding days. The timing of the beginning and end of the vegetative organs formation in P. abies trees did not differ significantly in the forest green zones and suburban forests.

Keywords

phenology of Picea abies, South Karelia, urban forest, suburban forest, forest green zones

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