Morozyuk O. Bioproductivity of Cherkassy region forests and its dynamics

Object - processes of accumulation of phytomass and deposited carbon in forests of Cherkassy region. Purpose is to study up the methodology of estimation of phytomass components and deposited carbon dynamics and to realize it in stands of main forest-forming tree species of Cherkassy region within the borders of state forest enterprises. Methods - theoretical investigation of this work is founded upon both general scientific (analysis, synthesis, observation, experiment and modeling) and specific cognition methods, which are developed for forest mensuration, forestry, vegetable physiology and other forestry-related branches of science. In order to solve certain specialized biometrical and mensurational tasks (finding form and tightness degree of coupling between mensurational indices, modeling of relations between these indices, estimating suitability and adequacy of models found), individual statistical methods (semigraphical, correlation and regression analyses etc.) were used within this study. Novelty - systematic retrospective analysis of dynamics of mensurational indices of stands of main forest-forming species within the borders of state forest enterprises of region is conducted; technical approaches to investigation of forests' bioproductivity is improved, making them, as opposed to existing ones, capable of calculating overall amounts of phytomass of regions' forests by groups of forest-forming species (coniferous, hardwood broadleaves and softwood broadleaves) and by age groups (young growth, middle-aged, premature, mature and overmature); qualitative and quantitative indices of ash trees' and stands' phytomass components were derived for the first time; coefficients for conversion of aboveground phytomass components of stands of region' main forest-forming species to their standing stock over bark were found; dynamics of overall phytomass and deposited carbon of stands within the borders of state forest enterprises of Cherkassy region was modeled; difference between anthropogenic emissions of CO2 and carbon deposition by stands of Cherkassy regional department of forestry and hunting; possible economical effect from carbon-depositing functions of forest stands of Cherkassy regional department of forestry and hunting is assessed. Results of researches - in order to increase forests' productivity and to attain complex use of forests; to solve a number of ecological, resource and production problems of forestry in the region of study as well as on the state level, the following is recommended for practical use: reference tables of dynamics of main phytomass components and deposited carbon; mathematical models for estimation of qualitative and quantitative indices of ash trees' and stands' phytomass components; coefficients for conversion of aboveground phytomass components to standing stock of stands and mathematical models for their estimation for main forest-forming species of region. Field - forestry.