Home – Home – Jornals – Siberian Journal of Forest Science 2018 number 1

Long-term studies in deciduous-coniferous forest, which has arisen during secondary regenerative succession on the felled area of the middle-aged bilberry spruce forest of the middle taiga of the Komi Republic, were carried out. Real data on changing morphological parameters and phytomass of structural tree organs of the birch Betula pendula Roth., B. pubescens Ehrh., spruce Picea obovata Ledeb., aspen Populus tremula L. and common pine Pinus sylvestris L. during development phytocoenosis are presented. The estimate of biometric characteristics of the forest stand was conducted by standard methods of forest valuation, the method of model trees was applied for the determination of the stock of organic substances. Allometric equations, interlinking morphometric and productional tree metrics, which were used hereinafter for determination of total budget of phytomass of aboveground tree organs of the stand, are ascertained. The underground phytomass was estimated using a theoretical model of distribution of resource along tree factions. Analysis of phytomass dynamics was carried out. It is shown that there is an intensive accumulation of forest stand phytomass at transition of the middle-aged deciduous-coniferous stand to age of ripening and maturity. It is ascertained that accumulation of organic substance by the forest stand in this period changes from 173 to 364 t/ha. Comparative analysis revealed that at favorable site-specific conditions of growth, the efficiency of deciduous-coniferous forest stands of middle taiga can reach values which are typical for forest stands of southern regions of the forest zone.