Comparative Analysis of Pine Resin Productivity in Different Forest Site Types
2018
Pastukhova, N.O. | Gorkin, A.I. | Lebedeva, O.P.
Pinus sylvestris L. has always been in the highlight of scientists and researchers due to its high resin productivity. The ability to allocate a certain amount of turpentine depends pr imarily on the forest type and stand growth conditions. For the comparative analysis of pine resin productivity in different forest growth conditions the authors established permanent sample plots in the middle-aged pine stands of the II-IV site quality classes of the myrtillustype forest, shrub and sphagnous drained and waterlogged growth conditions. In the course of the studies, the pine resin productivity was determined by the length of the turpentine flow by the four wounds method in the cardinal directions, which allowed obtaining reliable results within the shortest period of time. We identified the category of resin productivity for each tree. The influence of growth conditions on resin productivity was determined by the dispersion analysis and the percentage ratio of pine trees under different growth conditions. In favorable conditions for the growth and development of the stand, when surface runoff drainage and lowering the groundwater level, the pine resin productivity and the proportion of trees suitable for tapping increased. Hydrotechnical melioration allowed increasing the number of medium- and highly resin-productive pines by a factor of 3. Optimal conditions for the production of resin were provided only in the myrtillus-type pine forest. The dispersion analysis reliably confirmed the influence of growing conditions on the resin productivity of Scots pine.
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