FORESTRY INVESTIGATION OF OPTIMAL PLANTING DENSITY OF FOREST CULTURES OF EUROPEAN SPRUCE

UDC 630*232.4:631.543.2

  • Gvozdev Valery Kirillovich − PhD (Agriculture), Associate Professor, Assistant Professor, the Department of Forest Cultures and Soil Science. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: gvozdev@belstu.by

  • Volkovich Aleksandr Petrovich − PhD (Agriculture), Associate Professor, Assistant Professor, the Department of Forest Cultures and Soil Science. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: volkovich@belstu.by

DOI: https://doi.org/10.52065/2519-402X-2021-246-8-66–72

Key words: European spruce, planting density, radial growth, phytomass growing stock, forest mensuration indexes, growth success.

For citation: Gvozdev V. K., Volkovich A. P. Forestry investigation of optimal planting density of forest cultures of European spruce. Proceeding of BSTU, issue 1, Forestry. Nature Management. Processing of Renewable Resources, 2021, no. 2 (246), pp. 66–72 (In Russian). DOI: https://doi.org/10.52065/2519-402X-2021-246-8-66–72.

Abstract

The research was carried out in forest cultures of European spruce, created in 1985 by 4-year-old seedlings with different planting density – 3 300, 5 000, 6 700 and 15 600 pcs/ha. The research grounding is given for using the value of radial growth, as well as the growing stock and structure of aboveground phytomass, as an indicator of an objective assessment of the success of plant growth during various forestry activities.

It was found that the value of radial growth at all age stages of the formation of plantings is significantly higher in forest cultures with an initial density of 3300 pcs/ha. On average, in comparison with dense cultures (15 600 pcs/ha), this indicator is higher by 30–50%, and in some years – more than 2 times. For the entire period of growth of forest cultures, depending on the trends of changes in annual growth, three periods of changes in annual growth in diameter are distinguished, which are characterized by their own trends in formation.

Data on the growing stock and structure of phytomass for all variants of the experiment are given. It was found that at the stage of exacerbation of intraspecific competition and intensive tree mortality, the growing stock of aboveground phytomass, including stem wood, are significantly higher in rare cultures (3 300 pcs/ha) and amount to 340.5 t/ha, which is 2.3 times higher than the same indicator for dense cultures. As the resulting indicators of the success of the growth of spruce forest cultures of different planting densities, the main forest mensuration indexes of forest stands have been analyzed.

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15.03.2021