Natural regeneration in the pine forests of the Novichikhinsky forest district in the Altai krai following regeneration felling

The influence of regeneration felling on the younger generation of forests in the pine plantations of the Novichikhinsky forest district in the Altai Krai has been studied. The age of felling is 19-21 years; the intensity of felling varies from 30 to 60%. The regeneration felling was carried out by evenly thinning the older generations of pine trees. The taxation characteristics of stands and undergrowth before and after felling are given. The current height increases are determined. The number and stock of dead trees on the studied plots are estimated. The study shows that in the conditions of fresh forest and dry forest on gentle slopes, the felling allowed rejuvenating pine plantations and accumulating a sufficient amount of undergrowth in them for successful forest regeneration. In the conditions of the grassy forest, the regeneration felling negatively affected the undergrowth and the forest stand. The study proves that the younger generation in pine plantations subjected to regeneration felling is formed mainly due to pre-generation undergrowth. The study revealed that after regeneration felling in the conditions of fresh forest and dry forest on gentle slopes, the undergrowth of pine trees shows a similar growth dynamics in height. It has been established that after regeneration felling, the current height gains of the pregeneration undergrowth increase over a period of 10-14 years, after which they begin to decrease. It is recommended to carry out the final regeneration felling on three studied plots; on one plot, it is recommended to cut down single trees and take care of young ones; on another plot, measures are needed to promote natural regeneration and subsequent regeneration felling, or to carry out interlaced gradual felling and the creation of forest crops in the cut-down strips.

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