南京城市森林植物叶面颗粒物的含量特征

采集了6个功能区(文教区绿地、城市公园绿地、居住区绿地、商业区绿地、工业区绿地和城市天然林)距离交通密集区不同位置(主干道、二级道路、绿地中心)的3种植物(法桐( Platanus orientalis Linn.)、桂花( Osmanthus fragrans (Thunb.) Lour.)、红叶石楠( Photinia×Fraseri ))的叶面颗粒物,定量分析了南京城市森林植物叶面颗粒物的含量及粒径分布。结果表明:(1)3种植物叶面单位面积滞尘量大小依次为红叶石楠((6.189±1.255) g/m^2 )、桂花((3.739±0.877) g/m^2 )、法桐((2.753±0.744) g/m^2 )。红叶石楠植物叶面单位面积滞尘量最高,分别约为桂花和法桐的1.7、2.2倍,且距离交通密集区越近,植物叶面单位面积滞尘量越高;(2)植物叶面颗粒物以粒径>10.0~250.0 μm的颗粒物为主,但其粒径分布受到植物种类、功能区以及距离交通密集区的远近影响。(3)植物叶面单位面积滞尘量受到植物生理特征、环境因素及尘源特征的共同影响。

Content characteristics of particulate matter on the leaf surface of Nanjing urban forest plant

By using the method of field surveys,leaf surface particulate matter were collected from 6 different land use (green space of cultural and educational zone (CZ),urban parks(UP), residential zone (RZ),business zone (BZ),industrial zone (IZ) and urban rural forest (URF)),different location from traffic intensive area (arterial road,secondary road and greenland centre),3 kinds of plants ( Platanus orientalis Linn., Osmanthus fragrans (Thunb.) Lour., Photinia×Fraseri ),dust retention per unit area of leaf surface were compared,and particle size distributions were analyzed. The results showed that:(1) dust retention per unit area of leaf surface were (6.189±1.255),( 3.739± 0.877) and (2.753±0.744) g/m^2 for Photinia×Fraseri , Osmanthus fragrans (Thunb.) Lour. and Platanus orientalis Linn.,respectively. Leaf surface of Photinia×Fraseri had the highest dust retention per unit area,which was about1.7 and2.2 times of that of Osmanthus fragrans (Thunb.) Lour. and Platanus orientalis Linn.. The closer the distance to main road,the higher the dust retention per unit area of leaf surface.(2)>10.0~250.0 μm was the main particle size on plant leaf surface,but its distribution was effected by plants, land use and traffic.(3) The dust retention per unit area of plant leaf surface was influenced by physiological characteristics of plant,environmental factors and dust source characteristics.