高交通密度道路周边乔灌草型绿地对大气颗粒物的影响

The effect of arbor-shrub-grass green space on atmospheric particulate matters around high traffic density road

在杭州临安一高交通密度道路周边的乔灌草型绿地中监测了PM 1浓度、PM 2.5浓度、PM 10浓度、温度、湿度、风速、气压、CO 2浓度,研究了颗粒物的日变化规律、乔灌草群落对其的消减影响及与气象因子的关系。结果表明:(1)不同粒径的大气颗粒物PM 1、PM 2.5、PM 10的日变化特征一致,表现为“早晚高、中午低”的现象,3者与同一气象因子的决定系数基本相同;(2)道路两边的绿地宽度并不一定越宽越好,还应考虑植物种类的配置结构、植被密集程度及经济性;(3)大气颗粒物浓度与温度、风速成负相关关系,与湿度、气压成正相关关系,其中风速是影响颗粒物浓度的最关键气象因子。

PM 1 concentration,PM 2.5 concentration,PM 10 concentration,temperature,humidity,wind speed,air pressure and CO 2 concentration were monitored in an arbor-shrub-grass green space around high traffic density road in Lin’an,Hangzhou.The particulate matters’daily variation,the effect of arbor-shrub-grass green space on particulate matters,and the their relationship with meteorological factors were studied.Results showed that:(1)the daily variation of PM 1,PM 2.5 and PM 10 was consistent,appearing as“high in the morning and evening but low at noon”.The concentrations of different particulate matter had similar coefficients with each meteorological factor.(2)The green space width depended on specific conditions,such as types of the plant community structure,the density of plants and economy.(3)The particulate matter concentrations was negatively correlated with temperature and wind speed,while positively with humidity and air pressure,among which the wind speed was the most important meteorological factor.