城市森林结构对空气负离子水平的影响

选择在吉林市具有代表性的城市森林类型作为研究对象，对不同结构类型城市森林中的空气正负离子浓度进行了测定，并对观测数据进行方差分析。结果表明，不同结构城市森林空气负离子水平差异极显，以乔灌草结构的复层林中空气负离子水平最高，空气质量最佳，空气清洁度等级最高，而草坪的各项指标最低，说明高大乔木对提高空气质量起到主导作用。

Effects of Structure of Urban Forestry on Aero-anion Concentration

To study the effects of structure on aero-anion concentration at urban forestry,the concentrations of aero-cation and aero-anion were measured on typical urban forestry,in Jilin city.The data were analyzed with variance-comparing statistical methods.The results are as follows:the concentration is significantly affected by structures of urban forestry.The level of aero-anion concentration and air quality grade is highest in multistratal forest that comprises arbor,brush and lawn,while the lowest is on lawn.The rests show that arbors have a dominant effect on the improvement of air quality.