Morphometric features of trees in the natural recreation complex “Sosnovy bor of Yagry island”

The research was carried out in pine plantations on Yagry Island in the Dvinsky Bay of the White Sea on the territory of the protected area “Sosnovy Bor of Yagry Island”. For the study, trial areas were laid out in typical pine forests for the island: blueberry, lingonberry and shrub-sphagnum. It has been established that in all types of forests, the predominant crown shapes are cone-shaped, ovate and spherical, and in shrubby-sphagnum pine forests and in blueberry and lingonberry pine forests, the cone-shaped crown prevails, accounting for 48 and 38 % of trees, respectively. Another important one is the ovoid shape in both cases, and the third one is spherical. The number of trees is decreasing by about 10 %. It is shown that the shape of acrons depends on age. As the age increases, the crown shape changes from cone-shaped to ovoid and then to spherical. Data on the relative height in different types of forest are presented. Their average value ranges from 48 to 70 cm/cm in different types of forests, and the weighted average value ranges from 47 to 64 cm/cm, while in pine forests on the mainland it is 116 cm/cm. The inverse dependence of the relative height on the diameter of the trees has been revealed, the correlation coefficients for different sample areas range from –0.76 to –0.86. It has been established that pine forests of different types are characterized as diverse in age. In the pine forests of the green moss group of forest types, trees from 20 to 160 years old are found, and in the shrubby sphagnum pine forests from 20 to 100 years old. 

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