Features of post-fire renewal of pine in the mountain forests of Southern Siberia

Abstract

The results of the features of reforestation after fires in the pine forests of the southern taiga within the boundaries of the forest areas of the Krasnoyarsk Territory are presented. The objects of research were the areas covered by fires of different types and strengths, in stands of pine of an ordinary mixed-grass group of forest types representing the forest fund of the region, and fire-free cenoses. A slight pre-fire renewal of pine under the canopy of the mother stand was noted. The reason for this is the blocking of the growing processes of pine seedlings and – strong competition for young plants for the resources of the environment with grass cover, as a powerful soil blackener and a consumer of water and nutrients in the future.

The impact of fires on the nature of pine plantations in the areas exposed to fire has been established. The influence of the type and strength of fires that determine the level of destructive impact of fire on the phytocenosis, on the density and biometric indicators of self-seeding and undergrowth of pine at the initial stage of post-pyrogenic succession was revealed.

The average strength of the grass-roots fire contributes to the plantations of young pine plants on the conflagration, but retains the negative impact of the herbage, which, after burning, quickly regains its position. A strong grass-roots fire destroys the lower tier of phytocenosis, subthreshold woody vegetation, damages mature trees and creates a more comfortable environment for young plants localized in the windows of the tree canopy. Here the prerequisites for the formation of a complex vertical structure of planting are created.

After a riding fire, the landscape loses its forest appearance, losing the main element of the plant community – the stand of trees. Pine restoration is progressing at a good pace near the sources of seeding, but this process fades away as you move away from the borders of the forest, which may lead to changes in the woody type of vegetation to grass, which has less forestry and ecological value.