广州市人行天桥叶面滞尘粒度特征及其来源  

Grain Size Characteristics and Sources Identification of Foliage Dust near Pedestrian Bridges in Guangzhou

作　　者：郑琰明[1] 李坚诚[1] 

机构地区：[1]韩山师范学院地理科学系,广东潮州521041

出　　处：《热带地理》2016年第4期649-657,共9页Tropical Geography

基　　金：广东省教育厅青年创新类人才项目(2014KQNCX193);韩山师范学院博士科研启动类项目(QD20150506);广东省教育厅(地理科学)专业综合改革试点项目

摘　　要：对2009年广州城区36座人行天桥上采集的植被叶面滞尘样品进行粒度分析,粒度结果显示：叶面滞尘多为沙质粉沙,粉沙、沙和黏土体积分数的平均值分别为53.99%、41.34%和4.67%;粒度频率分布呈三峰型,主峰态在10~200μm之间。4个市辖区叶面滞尘的粒度特征都较为相似,说明整个广州城区的叶面滞尘在成因和来源上都较为一致。叶面滞尘中的总悬浮颗粒物（TSP≤100μm）体积分数极高,PM_（2.5）和PM_（10）体积分数略低;PM_（2.5）/PM_（10）的平均值为0.36,推测其更多来自道路扬尘与建筑扬尘等局地污染源。风沙动力研究指示：其物源主要是由城区30 km范围内短距离悬浮搬运而来,属内源性颗粒物。Samples of urban dust deposited on leaf surfaces near 36 pedestrian bridges in Guangzhou in 2009 were measured to determine their grain size characteristics. The result revealed that the foliage dust was mainly composed of sandy silt, with silt volume content accounting for 53.99%, sand volume content for 41.34%, and clay volume content for 4.67%; Grain size frequency distribution showed three peaks, the main kurtosis lay between 10~200 μm. Grain size characteristics of the foliage dust in the 4 districts were very similar, that showed that as a whole of Guangzhou city, the causes and sources of the dust were relatively consistent. TSP（≤100 μm） content was high in the foliage dust, and PM2.5 and PM10 volume content slightly lower; the ratio of PM2.5 and PM10 was 0.36, indicating the pollution sources were presumably more from local road dust and construction dust. Moreover, study on aeolian dynamics of the foliage dust indicated that its source mainly came from suspended particulate matter within a short range of 30 km around the urban area, which belonged to the endogenous particles.

关 键 词：人行天桥 叶面滞尘 粒度 

分 类 号：X513[环境科学与工程—环境工程]