Zaytceva I. Bioecological mechanisms of wood introducent's adaptation in steppe zone of Ukraine.

The thesis examines bioecological adaptation mechanisms of wood and shrub plants, being introduced into the steppe zone of Ukraine. The research aims to clarify directions of plants morphophysiological response to xerothermic conditions, as well as introducents' usage opportunities in cultural phytocenosis of steppe zone. It has been complex investigated the introduced plants as biosystems with used bioecology, morphologycal, physiolology-biochemical methods. Experimental investigation based on the fields visual inspections, biometrycal measuring, computers' skyne programs, photocolorimetric snd spectrophotometric methods, electrophoresis in polyacrylamid gel. It has been used mathematical methods of estimate at statistical parameters, correlation and regression analysis, mathematical modeling of constant and stress state plants' organism at the base of nonlinear dynamic models from author's elaboration. Growth biology, metabolic and physiological processes in wood and shrub plants are investigated in dendrology plantations of botanical gardens in different regions of steppe zone of Ukraine, introducents drought-resistance degree is ascertained. Plant introduction test results are integrally assessed, wood and shrub plants introduction success forecasting criteria are defined. Adaptive strategies directions are determined in the general range of modification variability under conditions of sreppe zone of Ukraine. From the system analysis perspective, biological machanisms of ecological-climatic adaptation of wood introducents in xerothermic conditions of steppe zone are revealed. Regularity of phenotype polymorphysm characteristics are found out at different levels of the plant organism functioning in the process of adaptation to steepe zone conditions. The model is suggested, which outlines interrelation of ecologic factors and plants' water cycle processes. The methodology of plant state integral parameters detection is elaborated, notable entropy and thermodynamic characteristics, defining structural and metabolic peculiarities of plant tissues in ecological-climatic adaptation process. Based on the suggested empirical and statistic mrthods, a new approach is worked out to assess both the complexity of structural and functional plant organization, and mechanisms of their adaptation to steppe zone unfavourable ecological factors complex. On the base of materials of scientific observation were worked out recommendations at estimate The recommendations at drought-resistance estimation of arboreal plants and it use for cultural phytocenosis of steppe zone of Ukraine has been developed on the base of observation results and introduced in according to scientific, landscape design and project State institutions.