Rybak O. Silvicultural and environmental features of pine stands involving red oak in the fresh pine sites of Kyiv Polissia

The thesis is devoted to the research of biological stability and productivity of Scotch pine stands with understory plantings of red oak in the fresh pine sites of Kyiv Polissia. The introduction of red oak in pine stands of improves water-physical, physicalchemical and agronomic properties of soils, leading to increased fertility. In the stands of red oak amount of humus in the humus-eluvia horizon has increased by 0,4 %, the proportion of intensive decomposition of litter increased by 2 times. The soil with leave fall annually receives more than 270 kg•ha-1 of mineral elements. Ash of leave fall of pine and red oak stands in three times higher than the pure pine stands, which is 3,1–3,2 % and 1,1–1,2 % respectively. Introduction of red oak under canopy of pine stands accelerated succession of useful and harmful mesofauna, led to a significant enrichment of the diversity of species composition micromycetes, macromycetes, including micotroph species. Intensity mycorrhizae forming Scotch pine in 1.3 times increased the control indices, which significantly affected the growth, development and the state of pine stands. Dynamics of growth of pine plantations on the main valuation indicators was simulated. Productivity of pine plantations with red oak consistently increases after 60 years age and until the age of maturity reaches Іb class productivity. The red oak plantations have a beneficial effect on the quality parameters of the merchant structure of pine stands. The output of timber reaches 92 %, while the share of small wood more than 5 times less than the normative data. Experimental plantations account for 23 % of timber of red oak understory. The overall indicator of total biological activity of the soil in forest stands of red oak tier 2,3 times the benchmark that shows the effectiveness of the introduction of the plantation under the canopy of pine stands in terms of fresh pine forests sites of Kyiv Polissya.