摘要
通过对街区中茂密行道树对空气污染物扩散的利弊进行理论分析的基础上,以CO为自然示踪气体,对西安市几个典型街道中的气态污染物浓度分布做了实测。实测结果指出,道路车流量的大小是行道树树冠的净化功能和对污染物扩散的阻碍作用所占权重的主要影响因素,行道树对污染物扩散的阻碍作用主要受控于树木郁闭度而非绿量,指出城市道路绿化不应盲目追求绿量的提高,并据此提出在街道绿化中应根据车流量的大小采取不同绿化方案的建议。
The advantages and disadvantages of shade trees for pollutants absorption are analyzed theoretically,and the concentration distribution of gaseous pollutant is monitored and analyzed in Xi'an city by using CO as a natural environmental tracer.The result shows that the traffic density is the main factor affecting the weight of the cleaning effect and restricting effect of the canopies.The reason for the hindrance of pollutant diffusion in streets is the coverage level but not the green quantity,thus over increase in green quantity is of nobenefit in urban road planting,and some ideas for green planting in urban street is recommended.
出处
《城市环境与城市生态》
CAS
CSSCI
CSCD
北大核心
2003年第6期7-9,共3页
Urban Environment & Urban Ecology
基金
国家杰出青年基金资助项目(50125821)
关键词
城市
街道
空气质量
道路
绿化
污染物扩散
郁闭度
车流量
urban road planting
pollutant dispersion
coverage level of shadetrees
traffic desity
