Динамика экосистем свежего бора центра Приволжской возвышенности

Abstract

The results of a study of the dynamics of a rather rare type of forest ecosystem for the central part of the Volga Upland – fresh pinery (A2) – are presented. The research was carried out on the territory of the Upper Sura section of the Volga Forest-Steppe Nature Reserve. The progress of the process was studied in an age series, identified in homogeneous forest conditions based on the principles of dynamic classification of forest types. As a result of processing forest taxation data, average values of taxation indicators of forest stands were obtained for each age class. At the same time, an analysis of changes in all components of the plantings was carried out. On its basis, the age series was divided into separate periods and phases. Trends in the share of participation of each forest-forming species in the forest stand at different age stages are described by nonlinear equations. The study showed that the resulting age series represents a series of transformation of forest communities. Disruption of the forest formation process led to a large-scale replacement of indigenous plantings with derivatives. After the start of clear-cutting, the area occupied by deciduous trees (primarily birch) constantly grew. A consequence of the large-scale use of intermediate, sanitary and voluntary selective fellings was the formation of thinned pine stands. At the same time, a transformation of the lower tiers of communities also occurred. These factors caused a deterioration in the conditions for natural regeneration of pine (Pinus sylvestris L.). As a result, to date, the possibility of forming pine stands through natural regeneration is almost completely excluded.