On sustainability of dendrological collections of botanical gardens and arboretums parks in Russia

Dendrological collections, in the overwhelming majority of cases, are the basis of both collection funds of botanical gardens and dendrological parks, and their scientific and practical activities. They occupy most of the collection and demonstration sites, it takes more time to create them, and they are the most stable in time and space. This applies both to collections of closed soil and to open-source collections, and in the latter case they have a structure-forming significance. Fundamentals of the Strategy for the Stability of Dendrology Collections: 1. The composition of tree collections is determined by the optimal representation of the life forms of tree species, due to the soil and climatic features of the region or the design features of cultivation facilities, areas under dendro-collections and the focus of research activities. 2. The basis of stability dendrocollections is the correspondence of bio-ecological features of wood species to the main unremovable limiting factor, the absolute minimum of air temperature, while other limiting factors are disposable, local and have a differentiated effect on tree species. 3. The optimal quantitative representation of tree species in the composition of dendro-collections, expressed in collector numbers at the level of life forms, also contributes to their stability. 4. The level of agrotechnical measures for the care of collective plantations, including the care of plant crowns, should be high, and care itself regular. 5. Dendrological accounting is an important, albeit indirect, factor in the stability of dendrocollections.