期刊名称：International Journal of Environmental Monitoring and Analysis
印刷版ISSN：2328-7659
电子版ISSN：2328-7667
出版年度：2019
卷号：7
期号：5
页码：93-102
DOI：10.11648/j.ijema.20190705.11
语种：English
出版社：Science Publishing Group
摘要：This study assessed the spatial distribution of carbon dioxide emanation in selected residential estates and the impact of landscaping in reducing their levels in Ibadan metropolis. The study was carried out in high, medium and low commercial activity areas characterized by population density and traffic congestion within Ibadan city. CO2 concentrations and temperature were measured at 4 hourly interval from 9am to 5pm for a period of seven consecutive days while numbers of trees/plants (biomass density) were counted, at 21 different points from seven areas each with high, medium and low commercial activities. Measurements were carried out with the aid of calibrated portable gas meters. The means CO2 (ppm) were 542±95, 415±11 and 376±14 at 1.00 pm in the high, medium and low commercial activity areas respectively. CO2 concentrations were generally higher than IPCC value, but highest in the afternoon. Temperature values were generally higher in the afternoon in high and medium commercial activity areas, but lower in the low commercial activity zones. Significantly, density of trees in low commercial activity areas (234.3±6.7) was higher compared to those in medium (22.8±0.5) and high (24.2±0.7) activity areas respectively. An inverse correlation was observed between CO2 concentration and the density of trees (r=-0.456; p=0.038). The spatial distribution of CO2 concentration in relation to landscaping revealed that CO2 concentration reduces northward away from the urban core areas where there were fewer trees. The areas with low commercial activities had large numbers of trees while temperature and CO2 flux were lower in these areas. Temperature and density of trees contribute significantly in explaining the CO2 concentration (p=0.015). CO2 concentrations and temperature were high in high commercial activities areas in Ibadan metropolis, few or no trees were observed in those areas. Increase in density of trees could be attributed to decrease in the CO2 concentration. Hence, tree planting needs to be encouraged in the urban core of Ibadan metropolis to reduce air pollution.
