Modeling of the aboveground part of Scots pine trees components primary productions at the Eastern Polissya of Ukraine

The net primary productions of the aboveground phytomass components (tree trunks and crowns) are estimated for Scots pine trees, which grow mainly in pure and mixed (admixture from 1 to 3 units) pine plantations of artificial origin of the Eastern Polissya of Ukraine. Plantations are characterized as highly productive (II, I, Ia and above classes of quality), medium and high-density stands whcih grow in fresh forests (A2), subors (B2) and sogruds (C2). 80 temporary test plots (TTP) used, which were planted in pine stands of Sumy (36 TTP) and Chernihiv (44 TTP) regions, where 900 model trees (MT) of Scots pine were cut down and measured, of which 226 MT with fractional assessment of aboveground phytomass components and 674 MT assessment of crown phytomass. Measurement of models and calculations of aboveground phytomass components of Scots pine trees net primary productions was performed using improved applicable methods and developed algorithm. The set of values of the experimental material in natural quantities is characterized by the normal distribution of values by age, diameter, and height of trees and relative density of stands. The closeness of the connection exists between all the studied indicators of model pine trees (from moderate; -0.31