【摘要】 <正> 一、前言二氧化硫（SO₂）是大气中主要的气体污染物质之一。它来自各种含硫燃料的燃烧。石油化王厂、火力发电厂、金属冶炼厂、化肥厂和硫酸厂等均为SO₂的排放源。大气中的SO₂能被植物所吸收,并以水溶性无机盐的形式累积在叶中。叶中的含硫量和大气中的SO₂浓度的关系,李正芳（1981）对18个采样点中悬铃木叶的含硫量与各点空气中的SO₂浓度年平均值进行了比较,概率统计的结果表明它们之间的关系非常密切,其相关系更多还原

【Abstract】 The contents of total and soluble sulfur of two plant species（Casuarina equiselifolia and Eucaly-ptus exerta）in more than thrity atmospheric SO₂ monitoring sites were determined.The resultsare:1.Three industrial areas in Maoming city are the main pollution sources.2.The sulfur con-tent of leaves in all monitoring sites is 1—5 times higher than the controls,It shows that allof the monitoring sites are polluted by SO₂,but the extents of pollution are different.3.Thevariation of sulfur content of leaves is similar as that of daily average concentration of atmosp-heric SO₂.According to the content of sulfur pollutant and the injured extent of plants,it issuggested that the polluted status of Maoming city might be divided into three grades.The poltof these three grades is in agreement with that of isovalue line of atmospheric SO₂ concentra-tion.更多还原