Gonchar V. Silvicultural principles of forming highly birch and pine stands of Western Polissia.

Object of study - birch and pine forest stands of Western Polissya. The purpose of the work - to identify forestry taxations features growth birch and pine forest stands, the impact of deciduous trees on the forest floor formation, redistribution of nutrients in the soil and mycological structure of soil, develop a system of forest management on growing high performance birch and pine forest stands in Western Polissya. Methods - forestry taxations; comparative ecology; agrochemical; biological; mathematics and statistics. Scientific innovation. Found that the admixture of Betula pendula in the composition of pine tree stands increases the light (to 13.4%) in the forest canopy, increasing humus contents in the upper layer of soil, decrease (from 3.5 to 3.9) soil acidity (up to 1.89 %), reduction contents of alkaline hydrolyzed nitrogen in the surface layer of soil (up to 56 mg / kg), growth of average volume pine trees up to 6 meters of birch trees and creating conditions for appearance under the tent tree stands seedlings of oak. It is noted that in Western Polissya in the North used forestry subdistrict the most common is wet hihrotopy (45.4%) and pine forests trophotopes (51.3%), within the Central forest subdistrict dominated by fresh hihrotopy (40.3%) and upland trophotopes ( 46.1), and forestry in southern subdistrict most represented are fresh hihrotopy (50.4%) and pine forests trophotopes (54.2%). Determined the presence of moderate and strong correlation (0,30-0,96) between the proportion of stocks elementary parts of birch and pine stands and their potential performance. The smallest share of the pine (33%) is concentrated in mixed stands of the 1st to the 6th and largest of the 7 th to 10 th deciles. Studied that growth share Betula pendula as a part of mixed tree stands 20% promotes transition forest floor and reduce its stock of 24 t/ha in pure (10Sz) tree stands up to 13.2 t/ha in mixed (8Sz2Bp) forest stands. Established a set of standard types micromycetes that form the structure of mycological soil in tree stands of different composition. Practical meaning. The peculiarities of Betula pendula impacts on the formation of the forest floor, redistribution of nutrients in the soil, mycological soil structure, changes in growth pine in birch and pine stands in Western Polissya. The results of studies besides theoretical have applied meaning and aimed at introducing a system forestry measures of high-performance mixed birch and pine stands in terms of fresh oak of West Polissya. Research results used to develop recommendations on measures for the cultivation of high-performance mixed pine stands in the forestry of "Bereznovsky forestry" and working "Order of play and formation of birch and pine forests stands in the West Polissya". Areas of application - forestry.