城市植物绿化空间设计模式对污染物扩散消减的影响研究

Influence of Urban Plant Greening Space Design Mode on Pollutant Diffusion and Reduction

针对城市大气污染物的扩散问题,探究城市植物绿化空间设计模式的消减作用与影响。根据目标城市的大气污染状况与超标污染物种类,设计乔灌草、乔木、乔草、灌草、草坪五种植物绿化空间模式。对比分析不同季节、不同天气状况下污染物浓度的日消减量数据后发现,各类植物绿化空间模式均对气溶胶状态污染物与气体状态污染物的扩散问题具有显著的消减作用。但消减程度差异较为明显,乔灌草结构凭借多层复合式空间结构与耐寒、耐旱等特性,消减效果始终最优,应在城市植物绿地的规划与建设中予以推广。

Aiming at the diffusion of urban air pollutants,the paper explores the abatement effect and influence of urban plant greening space design mode.According to the air pollution status of the target city and the types of pollutants exceeding the standard,five greening space modes of trees and shrubs,trees,trees and grasses,shrubs and grasses,and lawns are designed.After comparing and analyzing the daily reduction data of pollutant concentration in different seasons and different weather conditions,it is found that all kinds of plant greening space models have significant reduction effect on the diffusion of aerosol pollutants and gaseous pollutants.However,the difference in the degree of reduction is obvious.The tree,shrub and grass structure always has the best reduction effect by virtue of the multi-layer composite space structure and the characteristics of cold and drought resistance.This structure should be popularized in the planning and construction of urban plant green space.