城市绿地植物群落空气负离子浓度及影响要素研究

Study on the Concentration of Negative Air Ions and the Influential Factors in Different Urban Plant Communities

通过对上海市6种典型城市绿地植物群落夏、秋两季空气负离子浓度的测定,分析了季节因素和群落因素对空气负离子浓度的影响关系,并重点进行了群落因素对空气负离子浓度影响的定量分析研究.研究结果表明:(1)城市绿地植物群落空气负离子浓度受到季节和群落两个因素的协同作用;(2)城市绿地植物群落夏季的平均负离子浓度高于秋季;(3)城市绿地植物群落的空气负离子水平受到群落叶面积指数LAI的影响,且与LAI呈显著的正相关关系;(4)受局地小气候因素的影响,城市绿地植物群落空气负离子浓度与温度呈显著的负相关关系,与相对湿度呈显著的正相关关系,与光照强度呈现出U型峰或V型峰的变化趋势.

Based on the observation of negative air ions of the summer and fall in six different urban plant communities,the impacts of urban plant communities on the negative air ions are discriminated.A quantitative analysis of the relationship between community factors and the concentration of negative air ions has been carried out.The results showed that（1） there are combined effects of seasonal factors and community factors on the concentration of negative air ions in different urban green communities;（2） in general,the average concentrations of negative air ions in summer are larger than those in autumn;（3） the concentration of negative air ions in different urban plant communities are affected by the average leaf area index of the community,they are significantly and positively correlated;（4） the concentrations of negative air ions in a fixed urban plant community are affected by the microclimate.It is negatively correlated with temperature and positive correlated with relative humidity,there is no significant relations between PM10 and negative air ions.In addition,negative air ions have a V-type or U-type nonlinear correlation with light intensity.