Study of larch plant growth processes using retrospective method

The methodology of construction of the growth progress table for a separate tree stand belonging to the category of single-age and highly productive is considered. The usual methods of studying the course of growth in this case cannot be applied. The exception is the historical method. In the absence of long-term observations, the dendrochronological method was used. According to the analysis of age cores, the growth course in diameter was restored. Through the diameter and number of barrels, the sum of the cross sections is determined. The number of barrels is calculated through a cutting constant. For larch, it is determined from the tables of the growth of normal larch plantations, for spruce. The species number is taken from the directory of the taxator of the Far East. This indicator is not characterized by high variability. The height growth course is determined by the analysis of the trunk for the growth course of two model trees. The remaining indicators were calculated according to commonly known formulas of forest taxation. For cores, the association of radial growth of 30 years with radial growth at other ages is determined. On one trial area, this connection can be traced to 90 years, on the other – to 60 years. After 110 years, the diameter increase in spruce is higher than in larch. In the future, it is possible to change the plantation to the dark coniferous formation. For another trial area, growth features were not studied due to the not high age of planting. The first structural restructuring of the larch occurred at the age of 20. The reason was the active natural decimation of lagging larch trees. Indirectly, this is confirmed by the change of asymmetry signs in larch after this age. Spruce in the process of optimizing the number of larch trunks took an indirect part, being in the stage of undergrowth. It did not have such a transition. Due to the preservation of the long building time, the tree has achieved maximum productivity in diameter, close to the optimal. The maximum average growth in woodland was recorded at the age of 90 years. Per year, it grew to 9.3 m3ha–1. Quantitative ripeness in larch occurred at the age of 90, in spruce – at 130. For two breeds, the maximum average increase in total productivity is observed at 90 years, and separately for larch – at 70 years. The woodland is characterized by a tendency to change the rock structure towards the dark-tailed taiga. This is also indicated by the lack of undergrowth of larch. Increased closeness in the woodland was maintained until the age of quantitative ripeness. After this age, the tree moved to the climax stage, which for larch will end at 190 years old.

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