城市行道树对一氧化碳和总悬浮颗粒物浓度的影响

The influence on street trees on the concentration of carbon monoxide and total suspended particulate

选择福州几种主种的行道树为研究对象,分析车流量和环境因素与一氧化碳(CO)、总悬浮颗粒物(TSP)浓度的关系,揭示行道树在控制CO、TSP浓度中的贡献.结果发现车流量与道路中央CO浓度呈显著的指数关系,树下的环境弱化了这种关系,表明它们关系的改变主要是由于行道树的存在引起的,其改变的幅度可能还受到行道树的生理周期及林冠结构等因素的影响.除了在小叶榕试验点,车流量与TSP浓度均表现为显著的指数相关,且道路中央高于树下环境,表明车流量与TSP浓度关系的改变主要是由于行道树的存在,其改变的幅度可能还与道路宽度、所经车辆车速等因素有关.环境的温、湿度与CO浓度表现为弱相关.除了小叶榕树试验点,其它试验点环境温度均与TSP浓度表现为显著的正相关.无论有无行道树存在,环境湿度均与TSP浓度表现为较强的负相关.

By taking some main street trees for Fuzhou city as research object,analyzed the relationships between vehicle flow、environmental factor and the concentration of CO、TSP,for which revealed the contribution of the street trees existing to regulation of CO and TSP concentration.The research found that the significantly exponential relations between vehicle flow and CO concentration in the middle of street.However,the under tree environment weaken the relation,which reflected the relation variation mainly induced by the existing of street trees,the range of variation was correlated with the physiology cycles and canopy structure of the street trees.There are significantly exponential correlations between vehicle flow and TSP concentration in others except F.microcarpa var.pusillifolia experimental field,where the middle of street was higher than under tree environment.The result show that the correlation variation was mainly induced by the existing of the street trees,the range of variation could correlate with street width and vehicle velocity.The relation between environmental temperature and moisture and CO concentration was both depicted weak relation.The correlations between temperature and TSP concentration were significantly negative correlate except F.microcarpa var.pusillifolia.Whether or not the existing of street trees,environmental moisture were obviously negative correlated.