The thesis is devoted to study of ecological and biological specifics and conditions of park-orchard stands in urban landscapes of old city. Historical-style genesis of urban landscapes and park-orchard stands system formation in Lviv city have been analyzed. Their phytocoenotic peculiarities - especially phloristic, three-dimensional, ecological and population structure, systematical organization, vital-ity, visual-aesthetical and decorative qualities, sanitary state and reclamation func-tions - have been researched and summarized. Urban peculiarities of city soils, their genetic and agrochemical specifications, degradation changes, conditions of soil cover of gardens and orchards have been studied; total pollution index of urban edaphotops with mobile types of heavy metals have been studied. For the first time, stability of groupings of soil microorganisms in phytocoenosises with differ-ent urbanization degrees has been evaluated using the metabolic index and micro-bial respiration index. Influence of three-dimensional structure of urban stands on their vitality and aesthetics has been examined. Also, the scale of aesthetic and ecology-phytocoenotical values of urbophytocoenosises has been modified; rec-ommendations on improvement of phyto-reclamation effectivity of park-orchard stands for the complex city green zones have been developed.The main outcome of research is development of ecological fundamentals and principles of introduction and phyto-reclamation of as a scientific and practical basis for urban green zone creation and ecosystem optimization means.1. Structural organization of park-orchard stand system in historical part of the city which remains in incomplete form in UNESCO protection zone has to be developed according to radial-circle scheme with using modern city park management elements: rocariums, orchards on roofs, vertical green orchards creation.2. Phytocoenotic structure of park-orchard stands in City Complex Green Zones (CCGZ) to a certain measure is determined by degree of anthropo-genic influence which intensiveness can be noticed from periphery of his-torical kernel towards the center, or from the first to fourth phytocoenotic belts. Species and forms diversity of park-orchard phytocoenoses in his-torical part of the city has been analyzed, and specific features of ecological and three-dimensional structure of stands have been characterized.3. Taking into account bio-ecological peculiarities of park-orchard stands, and considering also their decorativeness and aesthetics we recommend to use the proposed specific and formal content for the forming of park-orchard phytocoenoses, biogroups, row stands, solitaires, green fences, vertical green orchards creation, with use of wood and bushy exotic species appro-bated in our conditions.4. It has been determined that the landscape-aesthetic value of landscape groups can be decreased with the homogeneity and age of edaphicators. Considering the constantly increasing socio-cultural meaning of park stands, it is important to ensure formation ofphytocoenoses which would correspond to sanitary-hygienic and aesthetic needs, and - as self-regulated biological systems - would more effectively counteract to unfavorable im-pact of urbanization. Versions of landscape groups with high visual-aesthetic and decorative characteristics have been developed. 5. The single management of all stands systems has to increase in level of per-fection of relevant organization structures of CCGZ. Urban planners jointly with ecologists have to develop the system of green stands phytomoni-toring which might be used as a basis for new General plans for urban de-velopment and has to ensure the sustainable development of pzrk-orchard objects.
