Matushevych L. The productivity and aboveground biomass of birch in the stands of Ukrainian Polissia

Investigation object - processes of growth and productivity forming of Birch stands in Ukrainian Polissya.Investigation aim - theoretical basic and practical realization parameters evaluation of above ground phytomass of Birch trees and stands in Ukrainian Polissya.Investigation methods - theory of random variable distribution, regression analysis, quantity evaluation methods, modeling and testing of biometric parameters.Science novelty - for the first time investigation of dry and gravity density of stem wood and bark and crown branches for Birch trees have been conduct, mathematical models for their evaluation have been developed; quantitative evaluation of leaves shake in green crown and shake of dry matter in fresh leavers have been fulfilled and mathematical models of their dependence on tree biometrics parameters have been developed; mathematical models and standards for dynamic of aboveground tree and stand phytomass of Birch on their biometric parameters have been created; coefficients of ratio of Birch stands phytomass to growing stock in the bark have been calculated; standards for carbon evaluation in above-ground phytomass of Birch stands have been developed.Investigation results - follow results have been received: mathematical models for evaluation of dry and gravity density of stem wood and bark and crown branches of Birch trees; mathematical models for evaluation of leaves share in green crown and dry matter share in the fresh leaves of trees; mathematical models and standards for above ground tree and stand phytomass evaluation; coefficients of ratio of above ground Birch stand phytomass to their growing stem stock in bark; standards for evaluation of carbon in phytomass in Birch stands.Field - forestry.