摘要
带状绿地是城市绿地系统中的重要组成部分,其对城市绿地的建设和城市生态环境的改善起着重要的作用。选择北京市西四环旁侧6块不同宽度带状绿地作为研究对象,分析城市带状绿地宽度与负离子浓度、空气含菌量之间的关系,为城市带状绿地空气质量评价提供科学依据。研究表明：1）当城市绿地宽度为6~27m时,绿地内部的负离子浓度效应不明显;当宽度超过34m时,绿地内部的负离子浓度效应明显;当宽度为80m时,绿地内部的负离子浓度效应显著。通过Duncan＇S两两比较（P=0.05）,认为城市带状绿地可以明显发挥负离子浓度效应的绿地宽度关键值为34m左右（绿化覆盖率约80%）;2）当城市带状绿地宽度为6~27m时,绿地内部含菌量高于对照,抑菌作用不明显;当宽度大于34m时,绿地的抑菌作用明显且趋于恒定;通过Duncan＇S两两比较（P=0.05）,认为城市带状绿地可以明显发挥抑菌效应的绿地宽度关键值为34m左右（绿化覆盖率约80%）。
As a very important part of urban green space system, green belt plays an irreplaceable role in the construction of green space and improvement of ecological environment. In order to provide scientific basis for the construction of urban green belts, the effects of the different width of urban green belts on the air quality were analyzed. In this paper, six-green belts with different width including 6m, 16m, 27m, 34m, 42m, and 80m along the West Fourth Ring Road of Beijing were investigated in July of 2009. The results show that： 1） The green belts of 6-27m width have little effect on the increase of air anion concentration; an obvious effect with the width of more than 34m; an extremely obvious effect with the width of 80m. Based on Duncan＇S Post Hoc Tests （P=0.05）, it can be concluded that the critical width of urban green belt for the obvious effect on the increase of air anion concentration is around 34m （green cover percentage must be about 80%）; 2） The green belts of 6-27m width have an unobvious effect on the decrease of bacteria rate, and there are a more bacteria rate in plot 1, plot 2 and plot 3 than the control group; an extremely obvious and stable effect with the width of more than 34m. Based on Duncan＇S Post Hoc Tests （P=0.05）, it can be concluded that the critical width of urban green belt for the obvious effect on the decrease of bacteria rate is around 34m （green cover percentage must be about 80%）.
出处
《中国园林》
北大核心
2010年第12期20-24,共5页
Chinese Landscape Architecture
基金
国家自然科学基金(编号30972416)资助
关键词
风景园林
带状绿地
宽度
负离子浓度
含菌量
landscape architecture
green belt
width
air anion concentration
bacteria rate
