Development of standards based on the materials of the state forest inventory

The completed first cycle of the state forest inventory revealed discrepancies in wood stocks with forest management data. One of the reasons for these deviations is laid down in the current regulations. First of all, these are standard tables of sums of cross sections and stocks. The methodology of their construction is based on growth progress tables, compiled by different methods with unknown accuracy. Therefore, it is necessary to check the current standardized norms on homogeneous experimental material collected with a given accuracy. Such materials are data from the state forest inventory. In this work, based on the materials of the SFI in the Far Eastern taiga forest region, using the example of Daurian larch, a standard table of sums of cross-sectional areas and reserves was checked. Initially, a growth progress table was developed. Then, on its basis, a check of the standard table of sums of cross-sectional areas and stocks was performed. The use of the SFI database for the development of forest taxation standards is an understudied area. Firstly, there is no methodology for constructing such standards based on SFI materials, and secondly, temporary test areas or materials of ocular taxation are traditionally used to build growth progress tables. The number of permanent test areas of the SFI allows to determine the stock of plantings in a forest area with 5 % accuracy. The mass experimental material was initially used to build a growth progress table. The array of model trees was processed by statistical methods. The corresponding regression equations were selected for the averaged lines of height and diameter. A good approximation to the experimental data was shown by the logarithmic equation. The number of trunks per hectare is determined using a thinning constant. Other taxation indicators are found according to well-known formulas and ratios. The stock of the developed growth progress table deviates slightly (+7.6 %) from the stock of normal stands of larch of the third class of bonitet. A slight height deviation was established with the current discharge scale of larch volumes. The developed growth progress table characterizes the average values of larch taxation indicators in the Far Eastern taiga region, regardless of forest types and bonus classes. The standard table of sums of cross-sectional areas and reserves based on it differs from the current one. The line of sums of cross-section areas cuts diagonally the standard table of sums of cross-section areas and stocks developed earlier on the basis of growth progress tables.

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