WOODLAND: DYNAMICS OF AVERAGE DIAMETERS OF CONIFEROUS TREE STANDS OF THE PRINCIPAL FOREST TYPES
R. A. Ziganshin
V. N. Sukachev Institute of Forest, Russian Academy of Sciences, Siberian Branch, Akademgorodok, 50/28, Krasnoyarsk, 660036 Russian Federation
Keywords: лесной массив, хвойные древостои, ведущие типы леса, средние диаметры, возрастная динамика, текущий и средний приросты, Высокогорный Хамар-Дабан, Юго-Восточное Прибайкалье, woodland, coniferous tree stands, principal forest types, average diameters, age dynamics, current and average increment, Highland Khamar-Daban, South-East Baikal Lake region
Abstract
The analysis of age dynamics of average diameters of deciduous tree stands of different forest types at Highland Khamar-Daban (natural woodland in South-East Baikal Lake region) has been done. The aggregate data of average tree, the analysis of age dynamics of average diameters of a deciduous tree stands of stand diameters by age classes, as well as tree stand current periodic and overall average increment are presented and discussed in the paper. Forest management appraisal is done. The most representative forest types have been selected to be analyzed. There were nine of them including three Siberian stone pine Pinus sibirica Du Tour stands, three Siberian fir Abies sibirica Ledeb. stands, one Siberian spruce Picea obovata Ledeb. stand, and two dwarf Siberian pine Pinus pumila (Pallas) Regel stands. The whole high-altitude range of mountain taiga has been evaluated. Mathematical and statistic indicators have been calculated for every forest type. Stone pine stands are the largest. Dynamics of mean diameters of forest stands have been examined by dominant species for every forest type. Quite a number of interesting facts have been elicited. Generally, all species have maximal values of periodic annual increment that is typical for young stands, but further decrease of increment is going on differently and connects to the different lifetime of wood species. It is curious that annual increment of the dwarf Siberian pine stands almost does not decrease with aging. As for mean annual increment, it is more stable than periodic annual increment. From the fifth age class (age of stand approaching maturity) mean annual increment of cedar stands varies from 0.20 to 0.24 cm per year; from 0.12-0.15 to 0.18-0.21 cm per year - in fir stands; from 0.18 to 0.24 cm per year - in spruce stands; and from 0.02-0.03 to 0.05-0.06 cm per year - in draft pine stands. Mean annual increment of dwarf Siberian pine increases with aging and increment of other species holds up almost the same, but decreases slightly with aging.
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