forest stand, stock, pine, birch, yield class, middle age, type of forest vegetation conditions, relative completeness, structure, tax and biometric indicators
Abstract
The results of stationary research in birch-pine stands are presented. The research has shown that the presence of birch-pine stands also acts as a powerful stabilizing and soil-cleansing factor. Swine conditions, according to forest regeneration theory, are interpreted as the most extreme for the growth of woody vegetation. In the analyzed type of forest vegetation conditions, which is one of the most common within the Western Polissia, forest stands are formed with the participation of two of the least demanding tree species regarding soil – pine and birch. Soils in these conditions change sequentially from pine sands in dry and fresh forests to sandy-podzolic in moist conditions, gleysol-podzolic in humid forests, and peat-gleysol sphagnum bogs. It is understandable that here the diversity of tree species suitable for afforestation is limited. Taxation and biometric assessment of forest elements are provided on research sample plots. The results of research on the impact of intensity of inspection cuts on the formation of taxation indicators of birch-pine forests have been analyzed. The peculiarities of changes in taxation indicators of forest stands at the age of cleanings have been studied. After the conduct of care cuts in the stands on the investigated stationary, taxation indicators significantly changed, the number of trees per unit area decreased, and the nourishing area of the trees that remained after silvicultural measures increased. Signs of wood stock accumulation are differentiated by equal parts. It has been established that thinning of various intensities significantly influences the structure of forest stand stock. An increase in the average age of tree condition also contributes to an increase in the share of stocks in the upper equal parts of the distribution. This means more accumulation of large pines. The obtained generalizations allow for an objective approach to the design of forestry measures in birch-pine stands of fresh forests in the process of economic activity.
Author Biographies
V. M. Sukhovych, National Forestry University of Ukraine, Lviv
Post-graduate Student
L. I. Kopiі, National Forestry University of Ukraine, Lviv
Doctor of Agricultural Sciences, Professor
I. V. Fizyk, National Forestry University of Ukraine, Lviv
Candidate of Agricultural Sciences (Ph.D.), Postdoctoral Fellow
S. L. Kopiі, National Forestry University of Ukraine, Lviv
Candidate of Agricultural Sciences (Ph.D.), Associate Professor
А. А. Novak, National Forestry University of Ukraine, Lviv
Candidate of Agricultural Sciences (Ph.D.), Associate Professor
M. L. Kopiі, National Forestry University of Ukraine, Lviv
Candidate of Agricultural Sciences (Ph.D.), Assistant
О. О. Meleshchuk, Branch of Kostopil Forest Enterprise "State Enterprise Forests of Ukraine"
Candidate of Agricultural Sciences (Ph.D.), Director
V. M. Honchar, National University of Water and Environmental Engineering, Rivne
Candidate of Agricultural Sciences (Ph.D.), Associate Professor
