Specific aspects of resin production in pine (Pinus sylvestris L.) stands of different stand composition and commodity structure in the blueberry forest type

The relevance of research on this issue today is of particular importance, because in connection with the current situation the issue of import substitution of products of harvesting and processing of oleoresin is quite acute. Oleoresin extraction is based, as a rule, on the exploitation of pine stands, and during its realization the trees with increased ability to produce oleoresin mass are of great interest. According to the current rules of oleoresin harvesting in the Russian Federation, the following forest stands can be transferred for exploitation: forest stands with the share of pine in the stand composition of not less than 40% of the total wood stock of the forest stand. In connection with the above-mentioned, the purpose of this study was to determine the resin productivity of pine in stands with different shares of pine (Pinus sylvestris L.). Experimental objects for the study were mature stands of pine with the share of its participation from 50 to 100% on permanent sample plots in the Leningrad region. To determine the resin productivity of pine trees, the micro-wounding method was used followed by flow measurement after 10 hours. The study showed that the influence of stand composition on pine resin productivity is not unambiguous. In some cases, no clear differences were found between pine-dominated stands and stands with a lower proportion of pine. Probably, the influence of quantitative representation of trees by size categories is a more significant factor in resin productivity in stands with a different proportion of pine. In general, there is a tendency for greater oleoresin extraction as the proportion of pine in the stand increases with increasing trunk diameter class. For the permanent sample plots, in pure pine stands, no differences in oleoresin extraction were found between the control section and the section with integrated management. However, a significant difference was observed between the other variants, which is related, as well as in mixed pine stands, to the different proportion of tree representation by size stages.

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