中文摘要：

以北京市西四环旁侧城市带状绿地作为研究对象,采用小尺度测定的方法,分析城市带状绿地空气负离子水平及其影响因子。结果表明：城市带状绿地空气负离子浓度的日变化与季节变化均较明显;清晨时段负离子浓度较高,中午时段空气负离子浓度较低;7月空气负离子浓度最高,12月最低;空气负离子浓度与温度分别呈显著负相关（4、7月）、显著正相关（12月）,与相对湿度呈显著正相关,与空气含菌量呈显著负相关（P〈0.05）。

英文摘要：

Taking green belts along the sides of the West Fourth Ring Road of Beijing as test objects,and by using small-scale quantitative measurement method,the air anion concentration and the affecting factors were studied for the urban green belts in Beijing.The results showed that there was an obvious diurnal and seasonal variation in the air negative ion concentration,being higher in early morning and lower in mid-day,and being the highest in summer and the lowest in winter.The air negative ion concentration was significantly negatively correlated with air temperature（April and July） and air bacteria rate,and positively correlated with air temperature（December） and air relative humidity.