不同类型城市绿地空气质量研究

A Study on Air Quality of Different Types of Urban Green Lands

为合理规划城市绿地,有益于人们户外活动,研究了不同类型城市绿地空气负离子浓度的日变化,不同类型城市绿地空气负离子浓度、温度、湿度、可吸入颗粒物、氮氧化物、二氧化硫、噪声的差异。结果表明:空气负离子浓度日变化均较明显,不同类型绿地空气负离子浓度、温度、湿度存在显著差异,生物群落越丰富、树龄越大、植被郁闭度越高则空气负离子浓度、湿度越高,温度越低;由枝叶茂盛的高大乔木组成的林地,其空气负离子水平和空气质量较好。空气可吸入颗粒物、氮氧化物、二氧化硫及噪声污染与植被有一定的相关性,相关关系不显著。

Diurnal variation of air anions,and differences of air anions concentration,temperature,humidity,respirable particulate matter,nitrogen oxides,sulfur dioxide and noise were analyzed among different urban green lands to evaluate their impacts on human outdoor activities.The results showed significant diurnal variation of air anions.Air anions concentration,temperature and humidity were significantly different among different types of green lands.With increase of diversity of plant communities,tree age and vegetation closure,the air anions concentration and the humidity increase,while the temperature decreases.The air quality was better in forests composed of arbor trees with dense branches and leaves.Respirable particulates,nitrogen oxides,sulfur dioxide and noise did not significantly relate to vegetation types.