Seasonal development and perspectivity of introduced species Pinus L. in the taiga area (Karelia)

Abstract

The results of studies carried out in 1988–2016 are presented, from April to October in the Botanical Garden of Petrozavodsk State University (South Karelia, middle taiga subzone).  The objects of research were representatives of 4 introduced species of the genus Pinus: P. strobus L., P. montana Mill., P. pumila (Pall.) Regel., P. sibirica Du Tour. The timing of the onset of almost all phenophases in the species of the species Pinus under study largely depends on the current temperature regime of the air, the state of the environment for several days prior to the beginning of a particular phenophase, and also on the values – of the main environmental factors during the formation of wintering buds of the last year. A straightforward correlation was found between the dynamics of the studied environmental factors and the timing of the onset of phenophases. The earliest dates of the onset and end of phenophases were noted in P. pumila, and the latest in P. strobus. A comprehensive assessment of the prospects of the studied species made it possible to establish that P. sibirica, P. montana, and P. pumila (58–65 points) are quite promising, and P. strobus are promising (57 points). These species can be recommended for introduction into cultural communities and landscaping of settlements with a low degree of pollution by pollutants.