六种城市绿地内夏季空气负离子与颗粒物  

Air-borne anions and particulate matter in six urban green spaces during the summer

作　　者：吴志萍[1] 王成[1] 许积年[2] 胡立香[1] 

机构地区：[1]中国林业科学研究院林业研究所城市林业研究室,北京100091 [2]清华大学绿色大学办公室,北京100084

出　　处：《清华大学学报（自然科学版）》2007年第12期2153-2157,共5页Journal of Tsinghua University(Science and Technology)

基　　金：科技部科研院所社会公益研究专项资助(2004DIB1J031)

摘　　要：为合理规划城市绿地、有益于人们户外活动,研究了6种类型城市绿地空气负离子和颗粒物浓度的日变化、空气质量的差异,分析了负离子与不同粒径颗粒物之间的关系。结果表明:空气负离子和颗粒物浓度日变化均较明显;不同类型绿地空气负离子浓度存在显著差异,其浓度从大到小的顺序为阔叶乔草、乔灌草、阔叶乔木、篱草、针叶乔草、草坪;不同类型绿地空气颗粒物浓度没有显著差异。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。总体上空气负离子与颗粒物的相关关系不显著,相比之下,空气负离子对细颗粒物的中和能力较强。Air-borne anions, particulate matter concentrations and air quality were analyzed during the summer in six urban green spaces to evaluate the effect of urban green spaces and then effect on outdoor human activity. The results show that the anion and particulate matter concentrations varys markedly with time and the anion concentrations differ significantly among the six green spaces. The anion concentrations decreased from high to low in the deciduous tree-herb, arbor-shrub-herb, deciduous tree, greenbelt -herb, evergreen tree-herb, and herb. The Particulate matter concentration did not significantly differ among the 6 green spaces. The anion concentration was higher and the air quality was better in forests dominated by trees than by other vegetations. The anions effectivety neutralize PM2.5 particulates.

关 键 词：城市绿地 空气负离子 空气颗粒物 空气质量 

分 类 号：X173[环境科学与工程—环境科学]