Natural regeneration after partial logging in pine forests of Krasnoyarsk forest steppe

The results of the study of the quantity and state of understory of young’s regeneration after partial logging of 20 to 53 % logging intensity in mature pine forests of Pogorel’skiy pine forest are shown. Evaluation of logging operations showed that under the canopy of the remaining part of tree stands, forest site remain close in terms of the stands that are not logged. A comparative analysis of the number and life status of pine undergrowth has been carried out in pine­herbal­green moss and cowberry – herbal­green moss. Before logging, regeneration, taking into account the life condition of the undergrowth, was assessed as insufficient and partial renewal was required for regenerations. It was noted that after the first stage of partial logging in high­grade pine forests, a large number of viable young growth appeared. The number of undergrowth on the skidtaril was less compared to cut strips. However, in the runways, 4–5 years after cutting and self­seeding, there were 3 times more than in cut strips. Thus, at all 7 sites after cutting there is a sufficient number of conditionally large undergrowth, for 4 of them it exceeds the specified minimum several times. Even a weak cutting intensity of 20 % stimulated the regeneration process, but a high number of pine undergrowth is characterized by a weakened condition, which indicates a lack of lighting and the need for and the possibility of carrying out a second partial cutting. It is shown that the best preservation and subsequent renewal of pine after cutting are marked at a cutting intensity of 35 %. An increase in the intensity of cutting up to 53 % contributes to the appearance of a large number of shoots and self­seeding, while the small, medium, large undergrowth is highly damaged mechanically. We made a conclusion about the effectiveness of using the forestry measures that stimulate the forest renewal process.