The diameter structure of forests disturbed by the four-eyed fir bark beetle (Polygraph proximus Blandford)

Abstract

This article presents a study of disturbed fir stands in the foothills of the Eastern Sayan. The research was conducted through field surveys on temporary research plots. The data obtained were used to establish the distribution pattern of trees based on natural diameter classes. A comparative analysis of the data was carried out with standard series of distribution of the number of trees of fir forests by Falaleev. The study revealed variations in tree distribution, which could be attributed to dissimilarities in data collection techniques, as well as the condition of the forest stand following pest invasion.