SIMULATION MODEL FOR DYNAMICS ESTIMATION OF SCOTS PINE BIOMASS

Abstract

The paper is aimed at the development of a simulation model for estimation of Scots Pine growth. The model features nine phase variables: stem mass (volume), biomass of branches, needles, tender and thick roots, bark, gross annual photosynthesis, carbohydrate reserve and increment. The growth rate of a woody plant depends on the total amount of carbohydrates synthesized by the tree throughout the vegetation period. This value is based on the level of soil fertility and humidity, density of the wood stand, tree position in the canopy which defines the level of crown shading. Individual characteristics of the growth rate arising as a result of hereditary properties are taken into consideration. These include height growth rate, biomass increment rate, etc. Conclusion. The model developed llows calculating biometric indicators and biomass of certain tree components aged from 2 to 120-150 years. Model verification was carried out using the data from 48 cut down pine trees aged from 37 to 145 years. The determination coefficient (R2) amounted 0.849 for stems, 0.714 for needles and 0.72 for branches. The model is well adaptable for other tree species.