【摘要】 通过对北京市区的白皮松(Pinus.bungeanaZucc.ExEndl)不同年龄针叶中Cr,Zn,Pb,Mn,Fe,Cu等重金属元素及元素S质量分数的分析,探讨了它们与北京大气污染之间的关系。结果表明,各元素含量存在着地区和年际的差异:这些元素在重工业区和交通枢纽区的含量明显高于清洁对照区;近年来空气中SO2浓度有所下降,但重金属的污染情况仍不容乐观。研究结果基本上反映了北京地区大气环境质量近几年的变化。更多还原

【Abstract】 With the appearance observation and the determination of the contents of Cr,Zn,Pb,Mn,Fe,Cu and S in different ages of needles of Pinus.bungeana Zucc.Ex Endl,the relationship between the elemental contents in needles and the urban air pollution states were studied.According to the results,the elemental contents vary among different regions and years.It is obviously higher in industrial and traffic areas than in the clean control area.In recent years,the contents of SO₂ are decreasing,but the metal pollution state still cannot be optimistic.The results basically showed the change of air quality in Beijing in recent years.更多还原