Chen Lixin, Liu Chenming, Zou Rui, Yang Mao, Zhang Zhiqiang
Key Lab of Soil & Water Conservation & Desertification Combating, Ministry of Education, College of Soil & Water Conservation, Beijing Forestry University, Qinghua East Road 35, Haidian District, Beijing 100083, PR China.
Key Lab of Soil & Water Conservation & Desertification Combating, Ministry of Education, College of Soil & Water Conservation, Beijing Forestry University, Qinghua East Road 35, Haidian District, Beijing 100083, PR China.
Environ Pollut. 2016 Jan;208(Pt A):198-208. doi: 10.1016/j.envpol.2015.09.006. Epub 2015 Sep 15.
Studies focused on pollutants deposition on vegetation surfaces or aerodynamics of vegetation space conflict in whether vegetation planting can effectively reduce airborne particulate matter (PM) pollution. To achieve a more comprehensive understanding of the conflict, we conducted experiments during 2013 and 2014 in Beijing, China to evaluate the importance of vegetation species, planting configurations and wind in influencing PM concentration at urban and street scales. Results showed that wind field prevailed over the purification function by vegetation at urban scale. All six examined planting configurations reduced total suspended particle along horizontal but not vertical direction. Shrubs and trees-grass configurations performed most effectively for horizontal PM2.5 reduction, but adversely for vertical attenuation. Trapping capacity of PMs was species-specific, but species selection criteria could hardly be generalized for practical use. Therefore, design of planting configuration is practically more effective than tree species selection in attenuating the ambient PM concentrations in urban settings.
专注于污染物在植被表面沉积或植被空间空气动力学的研究，在植被种植能否有效减少空气中颗粒物（PM）污染这一问题上存在分歧。为了更全面地理解这一分歧，我们于2013年至2014年在中国北京开展了实验，以评估植被种类、种植配置和风力对城市及街道尺度下PM浓度的影响。结果表明，在城市尺度上，风场对植被净化功能起主导作用。所有六种考察的种植配置均能沿水平方向而非垂直方向降低总悬浮颗粒物。灌木以及乔木 - 草本配置在水平方向减少PM2.5方面效果最为显著，但在垂直方向衰减方面则相反。PM的捕获能力因物种而异，但物种选择标准很难在实际应用中一概而论。因此，在城市环境中减弱环境PM浓度方面，种植配置设计实际上比树种选择更有效。
