交通污染区城市绿化植物硫含量分布

为探讨城市绿化植物对交通环境中SO2的响应，以远离城市道路的相对清洁区公园生长的植物为对照植物，采集了广东省被广泛栽种的18种园林绿化植物的不同方位的叶片和树皮样品，用硫酸钡比浊法测定了每种植物样品在交通污染区面向机动车行驶方向、面向人行道方向及相对清洁区的植物样品等不同方位的植物叶片和树皮硫含量，分析了绿化植物在同一株植物的不同生长部位和不同环境中硫含量的分布特征。结果表明，交通污染区所有样品的叶片硫和树皮硫含量均高于相对清洁区的样品。其中，远离工厂的交通污染区生长的同一株植物，离机动车道越近，硫含量越高；靠近工厂的交通污染区的同一植物，离工厂近的部位的植物树皮硫含量高于面向机动车道一侧的植物硫含量。

distribution of Sulfur content in leaf and bark of green plants in the traffic polluted areas

The leaf and bark samples of 18 varieties of greening plants, which are commonly planted in Guangdong, were taken from two areas, urban traffic polluted areas and comparatively pollution-free parks far away from motor traffic to reveal the response of the Urban greening plants to SO2 in the traffic environment. The samples in urban traffic polluted areas were taken from the roadside close to motor traffic and the one close to sidewalk. The turbidimetric method with barium sulphate is used in determining the sulfur content for the purpose of analyzing the features of sulfur content distribution in different parts and environments of the identical variety of greening plants. The results indicate that the sulfur content in the samples from traffic polluted areas is higher than that from comparatively pollution-free areas. However, there are differences in sulfur content of the identical variety of plant samples from traffic polluted areas when taken into account the distance of manufacture industry. In traffic polluted areas far away from manufacture industry, the closer to traffic the higher the sulfur content while in traffic polluted areas near manufacture industry, the sulfur content of samples close to manufacture industry is higher than that of samples close to motor roadside.