园林绿化树种香樟叶片的含硫量动态分析

植物对一定浓度范围内的大气污染物,具有一定程度的抵抗及吸收净化作用。为了解南京市主要园林绿化树种香樟（Cinnamomum camphora）叶片吸收净化SO2的能力,选择在5个不同污染靶区,以3个不同胸径级的香樟叶片为研究对象,采用硫酸钡比浊法测定了不同季节香樟叶片的含硫量。结果表明：香樟叶片对SO2具有一定的吸收净化能力,其叶片含硫量平均为0.2160%,且其含量随分布区、生长季节及个体胸径不同差异显著;并与异域大气中SO2污染指数成一定的正相关;与个体胸径大小成显著负相关;季节间呈现出＂先降后升再降＂的动态趋势,于春秋季较高,而夏冬季较低。

Dynamic Analysis on Sulphur Content of Leaves of Cinnamomum Camphora as An Ornamental Species

Plants have certain absorption and purgation ability to certain concentration range of air pollutant.Cinnamomum camphora is one of the main greening trees in Nanjing City.In order to explore the absorption and purgation ability of sulfur dioxide in the leaves,Cinnamomum camphora was investigated with three different diameter at breast height（DBH）as the research objects in five different polluted sites,and the sulfur content in leaves of each tree was measured in different seasons by turbidimetry,constant volume and 721-typed spectrophotometer.The results showed that Cinnamomum camphora had certain absorption and purgation ability to sulfur dioxide which widely varied with different sites,seasons and different diameter at breast height.The average sulfur content in leaves was 0.2160%.It had a positive correlation with the sulfur content in the air.It had a negative correlation with diameter at breast height.It also was significant between seasons,higher in spring and autumn,lower in summer and winter.