Growth and regeneration of Siberian stone pine at the objects of forest drainage in the Northern pre-Urals of the Komi Republic

The purpose of the work is to study the growth and regeneration of Siberian stone pine at the objects of forest drainage in the Northern pre-Urals, which are of scientific interest in connection with the extreme eastern position of these objects in Europe and the presence of Siberian stone pine in the stands, classified as protected species and included in the Red Book of the Komi Republic. Research was carried out in the Nizhne-Omrinsky district forestry of the Troitsko-Pechorsky forestry. Drainage was performed in 1989. In carrying out the investigations, existing recommendations for accounting of forest drainage efficiency and traditional methods of forestry and inventory studies were used. In stands at the objects of study, spruce is the predominant species. The participation of Siberian stone pine is from 0.5 to 6 units of the composition of stands. According to observations at weather stations in Yekaterinburg and Troitsko- Pechorsk, a reliable increase in precipitation due to climate change had been observed over the past century. Under these conditions, it was the forest drainage that could be a factor in balancing the arrival and consumption of moisture. Spruce prevails at the objects of study as part of regeneration. The regeneration of Siberian stone pine was noted at 87.5% of sample plots. The participation of Siberian stone pine in areas with its presence varies from 1 to 4 units. The absolute density of the Siberian stone pine varies from 0.1 to 1.8 thousand pieces/ha. Drainage had a positive effect on the regeneration of Siberian stone pine. In 75% of cases, small Siberian stone pine regeneration prevails, which appeared mainly after drainage. The density of the regeneration of all species, including Siberian stone pine, increases as it approaches the channels. Average periodic radial increment over the five-year period preceding drainage, in the first and second five-year period after drainage correspond to 0.58; 0.66 and 0.78 cm. The increment for the first and second five-year period after drainage compared to the five-year period before drainage was of 14 and 35% respectively. From the second five-year period after drainage, the increment increases. The increment is higher for young trees and trees, that located close to the channels. It is proposed to perform forest drainage of small objects with Siberian stone pine, to limit themselves to talveg drainage, not necessarily to straight-line channels, to include recommendations on local forest drainage of areas with Siberian stone pine in technological maps of forest cuttings, as well as in projects and technical maps of cleaning cuttings.

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