VARIETY AND AGE STRUCTURE OF WOODY PLANTS IN THE STREET PLANTATIONS OF THE CITY OF POKROVSK

Ye.P. Suslova

Abstract


Improvement of urban environment is an urgent and acute problem as pollution caused by industrial and vehicle emissions has become of globally dangerous character nowadays. The paper presents some results of research of woody plants in the street plantations of the city of Pokrovsk. The purpose of the work is to determine species composition, representativeness of species and the age structure of the street plantings in an industrial city in the south-easten part of Ukraine to provide information about the prospects of their growth and evolution in the urban environment. Trees were the objects of research of street plantings of the city of Pokrovsk, Donetsk region. At inventory of the trees we consider their quantity, age, height, and trunk diameter. We have estimated that 51 species and cultivar of woody plants of 33 genus and 20 families grow in street plantations. The most numerous families by the amount of species and cultivars are Rosaceae Juss. – 8 species, Salicaceae Mirb., Aceraceae Juss., Cupressaceae Bartling. – 5 species. Other families are represented by species which amount doesn't exceed three species. By species composition the most numerous are generic complexes Acer L. – 4 species, one form and Populus L. – 4 species. In the street plantations, among the bushes, are represented Syringa vulgaris L. (2.4 %), Spiraea vanhouttei (Briot) Zab (2 %), Philadelphus coronaries L. (1 %). The fast growing species predominate in the composition of the street plantations (48 % of the total amount of identified species). Species with a moderate growth rate are about 30 %. Slowly growing species amount 22 % (Armeniaca vulgaris Lam., Acer platanoides L. f. globosum). In street plantations there are trees at age from 10 to 60 years, bushes – from 5 to 30 years. Trees that are more than 60 year old form just 3 %. The most numerous age group in the age structure of the woody plantations is a group from 31 to 40 years (30 % from the total amount of the trees). A significant number of the trees (21 %) enter into the age group of 21-30 years. The analysis of the age structure of the bushes allowed to estimate that the largest number of plants is the age of 6-10 years (33 %); the considerable amount of the plants –11-15 years (27 %). We have come to conclusion, that woody plantations along the roads are represented by different age trees and bushes. Rapidly growing middle aged trees dominate in the structure of the street plantations (21-30 and 31-40 years), which form 51 % of the total amount of trees.

Keywords


street plantations; representativity; growth rates; age structure

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References


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DOI: https://doi.org/10.15421/40270418

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