Effect of Climatic Factors on the Growth of Representatives of the Genus Pinus (Pinaceae) under Conditions of Introduction

Four introduced and one aboriginal species of the genus Pinus L. have been studied in the middle taiga subzone of southern Karelia. Significant interspecific differences in the dates of onset, cessation, and peak of the growth of shoots and needles have been revealed. It has been shown that their annual increment depends on the rate of growth, rather than on its duration. The dynamics of shoot and needle growth in introduced and aboriginal species, though largely similar, differ in some respects. These differences reflect species-specific responses to hydrothermal conditions in a certain growing season.     

Effect of ecological factors on the seasonal growth of Alnus incana (L.) moench trees in Northern Karelia

Studies on speckled alder trees in an alder forest of grass-herb type in the northern taiga subzone of Northern Karelia have shown that specific features of the seasonal growth of shoots, leaves, and stems in these trees depend on a number of ecological factors, with air temperature playing the main role.     

Effects of environmental factors on the seasonal growth of <Emphasis Type="Italic">Picea abies</Emphasis> L. (Karst.) in northern Karelia

The seasonal growth of shoots, needles, and the trunk in the Norway spruce has been studied in a bilberry spruce forest in the middle taiga subzone of Karelia. The results show that the growth of vegetative organs in this tree species depends mainly on the air temperature regime, whereas the effect of variations in factors such as the period of sunshine, precipitation, and air humidity is relatively weak.