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以江苏省徐州市为例,选取市区3处交通要道两侧的典型道路绿地,在各绿带不同宽度处设监测点测定PM_(2.5)浓度以探讨道路绿地类型及宽度对其的消减作用。结果表明:PM_(2.5)的消减率与绿地的宽度成正比,道路绿地的宽度在24m及以上能够起到较好的滞留颗粒物作用,“乔+灌+草-乔”结构为主且郁闭度较高的植物配置模式消减效果最好。最后得到“乔+草+灌-乔”“乔+灌+草-乔”“灌+乔+草-乔”“草+乔+灌-乔”等4种消减PM_(2.5)污染的典型道路绿地群落,为城市道路绿地植物配置的选择提供基础数据。
Taking Xuzhou City, Jiangsu Province as an example, the typical road green spaces on the two sides of the traffic thoroughfare in urban area were selected. The PM 2.5 concentrations were measured at monitoring points with different widths of green belts to discuss the reduction of the type and width of the road green space effect. The results show that the reduction rate of PM 2.5 is in direct proportion to the width of green space, and the width of road green space can play a better role in retaining particles at 24 m and above. The structure of “Qiao + Irrigation + Cao - Qiao” Plants with higher canopy density have the best abatement effect. Finally get “Joe + grass + irrigation - Joe ” “Joe + irrigation + grass - Joe ” “irrigation + Joe + grass - Joe ” “grass + Joe + irrigation - Joe ” and other four kinds of reduction The typical road green space polluted by PM_ (2.5) provides the basic data for the selection of plant configuration of urban greenway.