Seasonal growth of needles in some introduced species of the genus Picea (Pinaceae).

摘要

Five species of the genus Picea were studied in the Botanical garden of the Petrozavodsk University in a subzone of the middle taiga. The species were P. pungens, P. canadensis [P. glauca], P. mariana, P. obovata and P. abies. Differences were foundbetween species in dynamics of shoot growth. The value of the annual increase in shoot length is determined primarily by the rate rather than duration of growth. There were differences in dynamics of shoot growth between native and introduced species. The pattern of the seasonal growth increment of shoots is dependent on the temperature regime and to a lesser extent on the humidity and precipitation.