植物配置方式对公园绿地调控ρ(PM_(2.5))的影响

Effects of Different Plant Configuration Modes in Urban Park Green Spaces on ρ(PM_(2.5)) Reduction

以奥林匹克森林公园内9个典型植物群落为研究对象,采用长期定点观测的方法,研究了夏、秋、春季节及全年不同植物配置模式对PM_(2.5)的削减率,分析了群落结构特征指标与绿地对PM_(2.5)削减率的相关性,以期为优化植物群落结构,提高城市绿地调控PM_(2.5)的功能提供定量参考。结果表明:稀树草坪对PM_(2.5)的净化能力显著低于林地,针阔混交林对PM_(2.5)的削减率大于阔叶林和针叶林;绿地对PM_(2.5)的削减率与林分乔木平均胸径呈显著负相关,与平均株高和冠幅呈不显著正相关;林分密度和郁闭度过大会导致林内ρ(PM_(2.5))升高。

Nine typical plant communities in Olympic Forest Park as objects were studied using longterm fixed-point monitoring method to analyze the seasonal and annual PM2.5 removal percentage by different plant disposition.The partial correlations between the removal percentage and the structure indicators of green spaces were also studied.It aimed to provide a quantitative reference for optimizing the plant community structure and improving the function of urban green space to control PM2.5.The results indicated that the purification ability of lawn with few trees to PM2.5 was significantly lower than that of woodland;PM2.5 removal percentage of mixed broadleaf-conifer forest was larger than that of broad-leaved forest and coniferous forest.ρ（PM2.5） reduction rate of green space had the significantly positive correlations with the diameter at tree′s breast height,and the insignificant positive correlations with plant height and crown width.The stand with too large density or crown density could lead to a rise in PM2.5 concentrations in green space.