华北地区陆生园林植物去除道路径流污染物的实证研究

Empirical Research on Removal of Pollutants from Road Runoff by Terrestrial Garden Plants in North China

利用植物来削减径流污染物浓度是植物生态修复理论的主要应用领域之一,其研究多集中在水生植物,对华北地区城市中大量的陆生植物的研究较少,尤其是对径流污染起重要源头控制作用的道路绿化植物及其长期修复效果更鲜有研究,无法满足实际应用需求。与此同时,对生物滞留设施中雨水径流长期集中入渗所带来的污染风险的研究也不足,对植物能否起到减缓污染物累积的作用尚不明确。通过盆栽试验分析了矮生紫薇等11种华北地区道路绿化常用的陆生园林植物对模拟径流中TN、TP、COD_(Cr)的去除效果,以及试验过程中土壤里TN、TP的积累量的去除率。希望能够对景观设计、环境工程等领域针对特定目标选择特定植物进行生态修复起到一定参考。

Using plants to remove runoff pollutants is one of the main application scenarios of phytoremediation.These researches mainly focus on aquatic plants,while there are few researches of remediation performance of terrestrial plants in cities in North China,especially the road greening plants,which play an important role in removal of runoff pollution at their source,and their long-term effect,that can not meet the practical application requirements.At the same time,the researches on the pollution risk caused by long-term concentrated infiltration of runoff in biological detention facilities are still insufficient,and whether plants can slow down the accumulation of pollutants is not clear.In this study,pot experiments were conducted to analyze the removal rates of TN,TP and COD_(Cr)in simulated runoff by 11 kinds of terrestrial garden plants commonly used in road greening in North China,and those of TN and TP accumulation in soil during the experiment.This study aims to help landscape designers and environmental engineers to select specific plants for ecological restoration.