广州绿地空气负离子水平及其影响因子

Air negative ion concentrations and their affecting factors in greenbelts of Guangzhou

研究了广州城市绿地空气负离子水平以及绿地类型、水体状态、海拔高度、天气阴晴、人类活动等因子对空气负离子浓度的影响。结果表明:广州城市绿地空气负离子浓度在103～3367个·cm-3,平均为426个·cm-3,与上海、深圳等地接近。所测定的几种绿地类型空气负离子浓度大小顺序为竹林>小叶竹柏林>花卉区>隆缘桉林>苗圃和草坪>住宅区;阔叶林>针阔混交林>针叶林。动态水的空气负离子浓度显著高于静态水;在本研究观测范围内,离动态水越远,负离子浓度越低。随着海拔高度增加,空气负离子浓度呈下降趋势。晴天的空气负离子浓度显著高于阴天。人流量和车流量与空气负离子浓度呈显著负相关。

By using DLY-3G air ion meter, this paper measured the air negative ion concentrations （ANIC） in the greenbelts of Guangzhou, and investigated their relations to the vegetation type, water body status, elevation above sea level, weather conditions, and human activities. The results revealed that the ANIC in Guangzhou greenbelts ranged from 103 to 3 367 ions · cm^-3 , with an average of 426 ions · cm^-3 and close to those reported from Shanghai and Shenzhen. The ANIC in test greenbelts decreased in the order of bamboo plantation 〉 Podocarpus nagi plantation 〉 flower plantation 〉 Eucalyptus exserta plantation 〉 nursery ≥ turf meadow 〉 residential area, and of broadleaved stand 〉 coniferous and broadleaved mixed stand 〉 coniferous stand. ANIC was higher at the places near running water than near still water, and decreased significantly with increasing distance from running water. It also had an increasing trend with the increase of elevation above sea level. Sunny days had significantly higher ANIC than cloudy ones. Both the number of passers-by and that of vehicles showed significant negative correlations with ANIC.