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Shoot and Needle Growth in Pinus Sylvestris as Related to Temperature in Northern Fennoscandia

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Abstract:

Shoot and needle growth of 20-year-old Pinus sylvestris trees was studied in relation to the temperature of the current and previous seasons at three localities in Northern Fennoscandia over a 10-year period. Leader length and the number of needle fascicles per leader had highly significant positive correlation coefficients with the mean June-August temperature of the previous season. A low number of needle fascicles per leader was associated with a high frequency of fascicles with three needles. Needle length showed a significant positive correlation with the mean temperature of the current growing season, particularly June-August temperature. Use of heat sums or respiration equivalents instead of mean temperatures did not significantly improve correlation coefficients. A highly significant positive correlation was also found between needle length and next year's leader growth. Forest Sci. 27:423-430.

Keywords: Scotch pine; elongation growth

Document Type: Journal Article

Affiliations: Professor of Botany, Department of Botany, Agricultural University of Norway, N-1432 ├ůs-NLH, Norway

Publication date: September 1, 1981

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