Manyuk V. Structure, typology, dynamic and restoration of oak-forests of Dnipro-Orelsky nature reserve.

Objects are the oak biogeocenoses of Dnieper valley in Dnieprovsko-Orelsky nature reserve and its out-skirts. The aim is to study of biogeocenotic structure and ecological role of oak-tree formation in formation of a vegetative cover of Dnieprovsko-Orelsky nature reserve to carry out their detailed typology and to define the basic ways of succession's development. Methods are the ecomorphical analysis, population analysis, geobotanical descriptions, bioecological mapping, phitoindication. Boundary of contemporary distribution of oak-tree formation (Querceta roborii) in Steppe part of Dnieper valley was ascertained, and the significance of Dnieprovsko-Orelsky nature reserve for saving of syntaxonomic biodiversity of flood-plain oak forest appreciated. There is suggested the improved and supplemented scheme of oak-tree forests typology for the conditions of Steppe part of valley of Dniepre based on the study of hydro-edaphotopes, ecological analysis of flora, biometric parameters of biogeocenosis and with using of postulates of theory of forest typology of O.Belgard. The reconstruction of natural area of oak-tree forests in above-rapids part of Dnieper is accomplished, the causes and scope of changes in their dimensions and structure are analysed. Proposal to inclusion of flood-plain oak-tree associations in the list of rare plant communities of Ukraine is substantiated. Forms of dynamic of oak-tree biogeocenosis (seasonal and fluctuating, cyclic and one-way successions) are considered, there are suggested the ways for their conservation, and also recommendations for management plan of Dneprovsko-Orelsky nature reserve and to planning of ecological net are given. Spheres of use are silvics, reserved business and training courses.