城市绿地对空气负离子的影响

在南昌市选择有典型特征的城市绿地,对其在不同环境状况下的空气正、负离子浓度进行监测。研究结果表明:(1)城市绿地能有效提高空气负离子数量;(2)乔、灌、草3种不同类型的绿地中,以乔木林对提高空气负离子浓度和改善空气质量的作用最为显著;(3)在城市环境下,不同林分结构类型的乔木片林对空气负离子水平以及空气质量指数(CI)的影响差异不显著;(4)天气条件对绿地的空气负离子水平存在显著影响;(5)喷泉对空气负离子有显著影响。喷泉周围空气负离子浓度节律性振荡周期与喷泉的喷水变化周期相吻合。喷泉对空气负离子浓度以及CI的影响随着距离的增加而迅速减小。

Relationship between Air Anions and Urban Green Spaces

The concentrations of air anions and positive ions in typical urban green space in Nanchang,Jiangxi Province,China were measured in the different environments.The results indicated:(1) Urban green space could increase the amount of air anions effectively;(2)Among arbores,bushes and lawns,the concentration of air anions and air clean index(CI) in the arbores were biggest in the same environment;(3)In the city ecology environment,the concentration of air anions and CI had no significant differences when the stand structure of arbores were different;(4)The concentration of air anions and CI in urban green space had significant difference between different weather: snow > rain >cloud > sun;(5)Fountain had great effect on air anion concentration.