THE INFLUENCE OF CHEMICAL TREATMENT OF YOUNG STANDS ON PINE LAYER IN FORMED MIDDLE-AGED MIXED FOREST STANDS
The long-term impact of earlier conducted silvicultural treatments on the parameters of the growing stock and the timber density of pine in mixed conifer stands in blueberry-cranberry forest type is observed. At the experimental plots due to chemical treatment at the stage of young stand and subsequent thinning forests of different composition and growing stock were formed to the present time. On the control plot without any measures conifers are not currently exist. The relationship between indicators of macro structure of pine xylem with wood density is given. Depending on the current stand composition at the experimental plots a different degree of relationship of wood density with the share of late and early xylem in annual ring is observed. More close correlation between these parameters is observed at the object with a chemical treatment of stand combining with thinning operations. The share of late wood increases with age from a larger size pine trees. The conducted study showed that the density of pine wood has a higher correlation with the width of the annual rings on the object with collaborative treatment than just using chemical treatment only. The density of pine wood has a tendency of growth from smaller to big degrees of thickness of stands on all experimental objects. At this section where the only chemical cleaning of deciduous layer was done, the current density of pine wood below of the average for the region of study to present time. At the experimental plot with the combined treatments, formed wood density of pine is at the level of average data for the study area.