PRODUCTIVITY OF MIXED AND PURE SPRUCE, BIRCH FORESTS IN TYPICAL GROWTH AREAS, MATURE AGE

Abstract

The data used in the study were collected from the workplace while working in the private forest sector for three years. The research objects are located in all regions of Lithuania. About 180 plots, covering an area of about 150 ha, were excavated and measured. The aim of the article is to analyze the volumes of spruce and birch stands growing in typical habitats at a mature age. To find out what effect of stand mixing on productivity. During the research, the species composition of stands, average tree diameter, average tree height, age, stand, salinity, number of trees (units) were determined. The following tools were used for the study: sword, busole, altimeter, thread meter, electronic scissors.

After analyzing the data, it was found that the most productive stands were pure spruce stands, with an average volume of 312.5 m3 / ha in fertile areas with temporary excess or normal humidity. With the emergence of birch in the spruce forests, productivity decreased. The most productive birch forests were temporarily in excessively or normal humidity, in fertile habitats with an average volume of 257.7 m3 / ha. In all habitats, the lowest productivity was in pure birch forests, but in contrast to spruce forests, productivity increased in birch forests with the appearance of spruce parts.