Studies of the increment rhythm of Scots pine and Norway spruce plants
The report gives simultaneous measurements of leading-shoot length, stem diameter and meteorological factors. The height and stem increment in pines is described during two growing seasons in the field at 67" N and during two months in climate chamber (pine and spruce plants). The daily increment rhythm, which was regular during fair weather days, varied during the season. The stem increment of the pines in the field started at almost the same time during the day (at noon and early in the morning during early and late growing seasons respectively). The continued growth was individual. Changes in the weather resulted in changes in the daily increment rhythm as well as regards the total diurnal growth. Stem-diameter variations, typical of hydration changes, have not been registred and the influence of dead tissue was inconsiderable.
Scots pine; Norway spruce; increment rhythm; climate chambers
Studia Forestalia Suecica
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