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Lesnoy Zhurnal

The Effect of Thinning on the Radial Increment of Scotch Pine

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O.N. Tyukavina, A.S. Il'intsev, R.A. Ershov

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UDС

630*238

DOI:

10.17238/issn0536-1036.2017.4.34

Abstract

Thinning is labor-consuming and costly. Therefore, a felling program linked with the terms, intensity, periodicity, which will allow intensifying forestry, should be formed. The theoretical basis of thinning for target and economic functions is to study the mechanisms of natural tree growth of different categories of development. The radial increment is the main indicator of the reaction of trees to the “social” position in the forest stand, climatic factors, economic activities. The goal research was the evaluation of the effect of thinning on the pine radial increment in the middle-aged forest stands. Thinning was carried out in 1993 according to the traditional crown thinning technology. Discount areas were established near the skid road and in the cutting center. The cores of model trees were selected at a height of 1.3 m perpendicular to the cut narrow strips (in the west-east direction). The productivity classes were determined by the relative diameter. The categories of tree growth were distinguished by the radial growth indices. After thinning, we did not observe significant change in radial growth, although some positive dynamics, especially in trees near the skidding trails, was noted. All investigated trees lowered the productivity class. 20 years after the cutting, a part of trees near the skidding trails moved to a higher productivity class, except for the 5th grade trees. The lack of response in trees belonging to different categories of growth was due to the fact that thinning was started relatively late, in the 50-year-old stands. The lack of thinning of the forest stand led to the presence of 12 % deadness and depression in radial growth. As a result, the improvement thinning became only a technical preparation for further sampling of trees.

Authors

O.N. Tyukavina, Candidate of Agricultural Sciences, Associate Professor A.S. Il'intsev, Postgraduate Student R.A. Ershov, Postgraduate Student

Affiliation

Northern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russian Federation; e-mail: olga-tukavina@yandex.ru

Keywords

thinning, myrtillus pine forest, radial increment, productivity class, category of growth.

For citation

For citation: Tyukavina O.N., Il'intsev A.S., Ershov R.A. The Effect of Thinning on the Radial Increment of Scotch Pine. Lesnoy zhurnal [Forestry journal], 2017, no. 4, pp. 34–44. 10.17238/issn0536-1036.2017.4.34

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Received on November 14, 2016

The Effect of Thinning on the Radial Increment of Scotch Pine

 

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