Patterns of growth of spruce stands in the far eastern taiga forest area

The article describes an algorithm for constructing a table of the course of growth of modal spruce plantations growing in the Far Eastern taiga forest region. A feature of the technique is that it is based on the use of bulk material from permanent sample plots laid down during the state forest inventory. This mass material was spruce model trees. The analysis includes trees belonging to the category of business, semi-business and woody. The relationship of height, diameter, commodity with age was studied using model trees, the parameters of the regression equations of the relationship were found, the percentages of output of industrial and firewood were established. The attraction of mass material excluded the selection of the natural series of development. It is replaced with averaged lines of heights and diameters. These two indicators are basic in determining the productivity of plantings of any species. The number of trunks was determined through a constant thinning established according to V. V. Zagreeva and average diameter. The remaining indicators are determined by the formulas known in the taxation. The method of constructing a growth progress table is essentially similar to the method of constructing bit scales of volumes. The difference is that the discharge scales of volumes characterize the dynamics of individual trees by thickness steps, and the table of the course of growth of many trees, but by age classes. The table shows the dynamics of the commodity structure of stands, the maximum of the average growth of business wood is determined, on the basis of which it is concluded that it is advisable to increase the age of felling in spruce stands to 160 years. Based on the growth progress table, a standard table of the sums of cross-section areas and stocks has been developed. A comparison with known standards has been made. The developed standard table practically coincides with a similar standard table constructed for normal spruce plantations of the III class of bonitet growing in the European part of the country. It is concluded that mass inventory materials allowed to reveal a general pattern in the formation of productivity of spruce plantations.

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