Relation between the development of the early age and thickness of trees and their branchiness in Scots pine stands in Finland

Heiskanen, Veijo

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Veijo Heiskanen

Puiden paksuuden ja nuoruuden kehityksen sekä oksaisuuden ja sahapuulaadun välisistä suhteista männiköissä

Heiskanen V. (1965). Puiden paksuuden ja nuoruuden kehityksen sekä oksaisuuden ja sahapuulaadun välisistä suhteista männiköissä. Acta Forestalia Fennica vol. 80 no. 2 article id 7164. https://doi.org/10.14214/aff.7164

English title: Relation between the development of the early age and thickness of trees and their branchiness in Scots pine stands in Finland

Abstract

The objective of the study was to establish the influence of the founding density of a stand and the intensity of intermediate cutting on the quality of pine saw logs stems, primarily on their branchiness. Measurements were carried out in 68 Myrtillus-type and 32 Vaccinium-type Scots pine (Pinus sylvestris L.) stands. The quality of 1,982 sample trees was assessed.

According to the results, the branchless part of the stem is longest in the older age classes of trees. In all age classes the percentage of the branchless part is highest in medium sized stems. The relative height of the crown limit is greatest in small diameter classes and continues as the thickness of the tree increases. The crown is longer in the thicker tree. The grade of the butt log is on average highest in medium sized stems. Knottiness of a log made it unsuitable for a saw log only among the thickest stems. The relative share of the u/s grade decreased as the thickness of the trees increased.

From the point of view of early development of the trees it was concluded that in all age classes the branchless part is the shorter the faster the tree has grown in diameter when it was young. Also, branches of the butt log are the bigger the faster the tree has developed when it was young. The grade of the butt log improves as the thickness of the annual rings diminishes.

To produce good quality sawn timber, the pine stands should be established dense, and the first thinnings should be delayed as much as possible. The best time for the thinning would be when the diameter of the dominant trees at stump height is 12–15 cm and when all the branches have died on the length of the butt log. After the first thinning, comparatively intense intermediate thinning may be applied.

The PDF includes a summary in English.

Original keywords
tiheys; mänty; laatupuu; tyvitukki; oksaisuus; kasvatustiheys; laatukasvatus

English keywords
Pinus sylvestris; Scots pine; density; quality; stand density; branchiness; knottiness; butt log; quality timber

Published in 1965

Available at https://doi.org/10.14214/aff.7164 | Download PDF

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