Evaluation of green area in the squares of Ulan-Ude city

Abstract

Research on green area in Ulan-Ude has not been carried out since the moment of planting in 1970. The researchers didn’t study hardy-shrub species and factors of their strengthening and weakening. The research aims at evaluation of green areas in the mini-parks of UlanUde. The authors assess green areas in all mini-parks of the city and define species composition of hardy-shrub species and their condition. The researchers found out 23 species of trees and shrubs used in landscaping of Ulan-Ude. The identified species belong to 12 families and 23 genera. The largest number of species belongs to Rosaceae-7 species, the smallest number of hardy-shrub species belong to Cornaceae, Adoxaceae, Oleaceae and Ulmaceae. The researchers observed hardy-shrub species and found out that trees predominate (56.3%) the shrubs (43.5 %). Dominating tree species in the mini-parks are the balsamifera (L.) and Ulmus pumila (L.). The bushes commonly observed are Caragana arborescens (Lam.). The vital state of tree and shrubbery plantings is generally characterized as medium-stable, damaged, ranging from stable, healthy to unstable, severely damaged. The range of tree and shrubbery plantings used in gardening of Ulan-Ude is completed. The conducted research revealed that the main factors of lower resistance of green area in the city mini parks are seen as damaged development of the crown and drying of branches, mechanical damages of a trunk; stripping of bark and small deformations and cracks in a trunk, damages in axial escape and the crown related to high density of landings, curvature of a trunk and break of boughs of trees and bushes as a result of influence of wind or anthropogenic activity; careless attitude to requirements of cutting trees and bushes; twisting of leaves, modification of shoots, colorful Gauls due to attacks on them aphids; the presence of bacterial diseases in balsamic poplar; infectious pathologies of trunks and leaves.