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Title

STUDYING SOME OF PHYSIOLOGICAL CHARACTERS OF COMMON TREES AND SHRUBS IN URBAN GREEN SPACES

Pages

 Start Page 505 | End Page 517

Abstract

 Knowledge of the physiological characteristic of tree and shrubs species and their adaptability to environmental factors is an important issue in SPECIES SELECTING for tree planting projects in water scarcity regions. Therefore, this investigation try to examine the CHLOROPHYLL content and STOMATAL CONDUCTIVITY in various species of trees and shrubs. The effects of environmental factors are also evaluated. The statistical population consisted of 12 trees and shrubs species that their CHLOROPHYLL content was measured by using “CHLOROPHYLL Content Meter” and STOMATAL CONDUCTIVITY was measured in 10 days by using “Porometer”device. Air temperature and wind speeds were recorded at each measurement with a portable “Testo”. Environmental data correlation with vegetation parameters were analyzed by multivariate data analysis. The results revealed that CHLOROPHYLL content and STOMATAL CONDUCTIVITY in different common species in urban green space have a widespread range.Nerium has the highest CHLOROPHYLL content and Ceasalpinia has the lowest CHLOROPHYLL content. Likewise, Fraxinus and Ceasalpinia have the highest and lowest STOMATAL CONDUCTIVITY. STOMATAL CONDUCTIVITY rate in the morning is higher than any other time in a day. While, Ceasalpiniaand Nerium show the highest negative correlation with temperature, Albizia and Cersis show the highest positive correlation. Wind increase STOMATAL CONDUCTIVITY in Pyrocantha and Robinia and decrease in Olea and Morus. It has less effect on other species.

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