Stupnikova T.V., Kositsyna O.A., Kozlova A.B.

Quantitative participation of arboriflora species in various types of green plantations of the city of Blagoveschensk (Amur region)

The paper represents the generalized results of a long-term research on the arboriflora in the residential area of Blagoveshchensk. It studies the diversity of species composition in accordance with the type of green plantations and shows the qualitative participation of these species in urban landscaping. The research was carried out by trial area method and rout-eye observations. The species composition of general and limited use plantings are examined, as well as special purpose plantings. Each species is specified with an absolute occurrence value, i.e. ratio of accounting areas where the species is detected to the total area. Absolute occurrence gradation is given according to the classification of N. S. Shikhova (2008), while Latin taxonomy follows the international Plant List base. In the green plants of the city, the total of 127 representatives of arboriflora of 63 genera and 29 families are found. Native dendroflora of urban plantations accounts for 62 species, while introducers and cultivars account for 65 species. Single-species families, one and two species genera dominate in the number of species. The greatest genera are Prunus L. (10 species) and Sriraea L. (9 species). Significant variation of cultivars (varieties and forms) in urban landscaping is found in Rosa L., Spiraea japonica L. f., Dasifora fruticosa (L.) Rydb. Physocarpus opulifolius (L.) Maxim., Hydrangea paniculata Siebold. Urban plantations reveal 66 species of shrubs, 38 species of trees, 5 species of lianas, 1 species of half-shrubs. In urban environment, 17 species develop a tree-shrub life form. Limited use plantings show the most wide-ranging woody species assortment (122 species), which is characteristic of unorganized urban landscaping. They are followed by general plantings (94 species), and special purpose plantings (56 species). The group of most frequent species in all the types of urban plantations include two species of trees: Ulmus pumila L. and Populus balsamifera L. Another widespread group of trees (with the occurrence rate varying from 20,1% to 50%) includes Betula platyphylla Sukaczev, Acer negundo L., Prunus padus L., Fraxinus mandshurica Rupr., Ulmus davidiana var. japonica (Rehder) Nakai, Syringa oblata Lindl. and Crataegus dahurica Koehne ex C. K. Schneid. The group of moderately common taxa (with the occurrence rate of 5,1-20%) includes 27 species, mainly the native ones: Juglans mandshurica Maxim., Pinus sylvestris L., Picea obovata Ledeb., Phellodendron amurense Rupr., Tilia amurensis Rupr., Sorbus aucuparia L., Acer tataricum subsp. ginnala (Maxim.) Wesm., Cornus alba L., Euonymus maackii Rupr., Syringa villosa Vahl. Singular (occurrence less than 1%) and rare groups (occurrence 1-5%) account for about 70% of the total species composition of arboriflora. This group is dominated by introducers: Acer mandshuricum Maxim., A. platanoides L., Berberis koreana Palib., Celastrus orbiculatus Thunb., Crataegus mollis (Torr. et A. Gray) Scheele, species of the genus of Juniperus L., Forsythia Vahl, Spiraea L

Keywords:WOODY PLANTS, QUANTITATIVE PARTICIPATION, TYPES OF GREEN PLANTATIONS, URBAN LANDSCAPING