STRUCTURE AND GROWTH OF THE STANDS, FORMED IN BURNS AND CUTTINGS IN KRASNOYARSK PRIANGAR’E
I. A. Tselitan, V. A. Sokolov, I. M. Danilin
V. N. Sukachev Institute of Forest, Russian Academy of Science, Siberian Branch Federal Research Center Krasnoyarsk Scientific Center, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation
Keywords: pine stands, progressive successions, structure, growth, biological productivity, Krasnoyarsk Krai
Abstract
The features of post-fire and post-felling formation of pure in composition and mixed pine stands in Krasnoyarsk Priangarye are considered. The structure, growth and biological productivity of forest regeneration successions are analyzed. The highest value of the phytomess of pine stands was 312 ton/ha in terms of absolutely dry matter. Structurally, the ratio of the phytomass fractions of forest stands naturally changes with an increase in their average age and density. At the early stages of development, the relative proportion of the mass of needles and crown wood is much higher than in older tree stands, and varies from 8-10 % at the age of 30-35 to 3-4 % at the age 100-120 years. The maximum biological growth potential in terms of the current increase in phytomass (in terms of total productivity) is realized by the pine stands at the level of 10.2 ton/ha/year of absolutely dry matter at the age of 56 years. At the same time, net primary production is 494 ton С/ha/year. The total phytomass of the pine forest at the age of 120 years reaches 1085 ton/ha. Natural restoration of forest cover in clearings by bedrock and the formation of pine stands is an ecologically positive process, since post-felling and post-fire young stands and middle-aged pine stands have high growth energy and phytomass production rates, more than two times higher than mature stands in the amount of fixed carbon atmosphere and have positive values of carbon balance and total destruction of organic matter according to the parameters «input-output».
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