Водный режим древесных растений в условиях достаточного почвенного увлажнения на северо-западе России

A comparative study of daily and seasonal variations of water flow rates and their driving forces, water potential gradients, in a coniferous (Pinus sylvestris L.) and a deciduous (Betula pendula Roth) species growing under sufficient soil moisture conditions in Northwest Russia (southern Karelia) was carried out. The ranges within which water regime variables fluctuated within several growing seasons were determined, and their mean values over a growing season were calculated. The values of the investigated parameters in both species were constant over multiple-year periods. On the other hand, the two species differed in the water flow rate within a growing season. These distinctions were largely due to the structural-functional characteristics of the water conducting system specific to the coniferous and the deciduous species.