Structural features of the main forest producers at the initial stages of ontogenesis

Abstract

Abstract Based on the analysis and generalization of the research results, the authors draw conclusions about the adaptive reactions of dark coniferous species of Siberian spruce (Picea obovata Ledeb.) and Siberian fir (Abies sibirica Ledeb.) during the forest formation process in the province of dark coniferous forests of the Southern Urals. Structural features are manifested in the modification of the xylorhizome, the duration of growth, the nature of rooting, and are a display of the mechanisms of morphological adaptation to ecological-coenotic conditions and to the influence of soil-ecological components of the substrate. The authors researched anatomical and morphological changes in xylotomic formations from juvenile to the beginning of the immature period of the adaptation process, leading to the viability of woody plants in contrasting natural conditions. Since the structural and functional organization of vegetative shoots, renewal is modified in the process of adaptation. It is shown that up to the moment of development of the trunk, differences in the lignified rhizome are more significant, based on anatomical sections, as well as the level of formation of plant tissues and the nature of age-related changes. The rates of formation of certain anatomical elements of wood as a whole are not the same for each species and depend on age-related changes, ecological plasticity, environmental conditions and many other internal and external factors