北京市交通干道防护林带内PM_(2.5)浓度变化特征  

Variations of PM_(2.5) Concentrations Inside the Greenbelts along Two Urban Traffic Arteries in Beijing

作　　者：李素莉 杨军[2] 马履一[1] 贾黎明[1] 李荣桓[3] 秦永胜[3] 

机构地区：[1]教育部森林培育与保护重点实验室北京林业大学,北京100083 [2]地球系统数值模拟教育部重点实验室地球系统科学研究中心,清华大学,北京100084 [3]北京市园林绿化局,北京100083

出　　处：《西北林学院学报》2015年第3期245-252,共8页Journal of Northwest Forestry University

基　　金：北京市科技计划(Z121100000312069,Z121100008512002)

摘　　要：选择北京市北五环路和京藏高速路上的5个地段对PM2.5浓度、温度、湿度、风速风向进行了连续观测,并对各地段的PM2.5浓度变化和环境因子的关系进行了回归分析。结果表明:1)有林带和无林带地段上的观测点的PM2.5浓度变化趋势不同,无林带地段各观测点的PM2.5浓度一般随距道路距离增加变小,有林带地段各观测点上PM2.5浓度则有升有降;2)林带内各观测点的PM2.5浓度和道路侧的PM2.5浓度显著相关,和林内的温、湿度显著相关,但和林内风速的相关性不显著;3)林带的宽度对林带内各观测点的PM2.5浓度有一定影响。In this study, the concentrations of PM2.5, air temperature, relative humidity （RH）, wind speed, and wind direction at five locations on the North Fifth-ring Road and Beijing-Xizang Highway were continuously monitored. The correlation between the concentration of PM2.5 and environmental factors was analyzed using a regression analysis method. The results showed：1） the variation trends were different between locations with greenbelts and the location without a greenbelt. For the location without a greenbelt, the concentrations of PM2.5 decreased as the distances to the road increased. For locations with greenbelts, concentrations of PM2.5 at different distances showed both increasing and decreasing trends; 2） the concentrations of PM2.5 at roadside had a significant influence on the concentrations of PM2.5 inside the greenbelts. The influences of air temperatures and RH were also significant. However, no significant relationship was identified between the concentrations of PM2.5 and wind speeds inside the greenbelts, and 3） the width of greenbelt had some effects on the concentrations of PM2.5 inside the greenbelt.

关 键 词：林带 PM2.5 环境因子 削减作用 

分 类 号：S732[农业科学—林学]