UDC

Authors

Abstract

The paper analyzes the needle span of life and biometrics in the pine plantations of the Solovetsky Islands as well as their variability under the influence of various factors. The needle span of life is up to 6 years. The main part of needles (up to 90 %) is of the current year and of the age of 1–3 years. The needles span of life depends on the position in the crown and on the inventory parameters of a tree: the needles of the greatest longevity are in the middle of the crown; an increase in age, height and diameter of a tree decreases the needles span of life. The average values are calculated: the area of needles is 109.51±1.70 square mm, the length is 29.20±0.32 mm. Needles in the crown become smaller from top downward. The growth of a tree causes the increase of the needle sizes. Illumination is the main reason of the variation of needle span of life and biometrics: with its increasing (higher rates of photosynthesis) the longevity becomes shorter, but the sizes grow. Long-term dynamics of needle sizes is determined by the weather conditions: an increase of temperatures leads to a reduction of the needle biometrics; an increase of precipitation up to a certain extent leads to the increase of these parameters. The reasons are the relatively dry soil conditions and “draining” as a result of thawing in the winter. The biggest influence on the change in needle size has the warm season. Most of the changes in the needles span of life and biometrics are non linear. The index of needle surface in the studied pine forests corresponds to the lower limit for the boreal pine forests (4.5 ha/ha), which is due to more severe environmental conditions.

Keywords

References

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