Рост древостоев разных пород в одинаковых условиях местопроизрастания на Большом Соловецком острове

Abstract

A study of forest stands consisting of five different tree species, both native and introduced ones, on Big Solovetsky Island is presented. On the territory of an uncared nursery (established in 1927 by sowing seeds) there exist plantations of Scots pine (Pinus selvestris L.), Siberian stone pine (cedar) (Pinus sibirica Du Tour), Douglas fir (Pseudotsuga menziesii Mirb.), Norway spruce (Picea abies L.), and Siberian larch (Larix sibirica Ledeb.). The purpose of our research was to study the growth of different species of the same age in the same growing conditions among blueberry plants. It has been established that the density in stands of different species ranged from 370 to 2970 pieces/ha, while only 4 specimens of Douglas fir survived. The heights and diameters of existing trees were analyzed, as well as the radial growth of 10 accounting trees from each stand on cores (wood samples) taken with an age auger. Radial growth was measured using an MBS-1 microscope with an accuracy of ±0,05 mm. It was found that at the time of the study, stands of different species were 80 years old. All of them had a height within 17,7 ... 18,9 m,and only the Siberian pine was clearly lagging behind in growth. On the contrary, the average diameter differed markedly which was the largest in Siberian larch (20,7 cm), the smallest in Siberian pine (15,8 cm). The Douglas fir has an average diameter of 27 cm, but only 4 specimens of this species have survived and therefore it can be assumed that such a high average diameter is due to the so-called light increment. It is shown that the width of the annual ring on average for the studied period ranged from 0,59 to 1,66 mm. All introduced species (Douglas fir, larch, Siberian pine) had a width of the annual ring greater than native species of pine and spruce. The greatest differences in radial growth were observed at the initial stage of growth. All tree species tend to decrease in radial growth with age. Changes in growth over time are synchronous in Scots pine and Siberian pine; asynchronous changes in spruce and pseudo-hemlock and spruce and larch.