In order to discuss the application values of the dendrochemistry for the research of urban environment pollution, using wet digested method and ICP mass spectrometer, the concentration of S and Pb elements for the tree rings of spruce ( Picea asperata) form the campus of Chang' an University in Xi' an city is analyzed. The concentration of S and Pb elements are compared with the primary energy consumption and the quantity of automotive vehicles in recent years in Xi' an city. The analysis results indicate that the concentration of S elements in annual rings has a positive correlation with atmospheric SO2 pollution which was caused chiefly by the coal combustion. The concentration of Pb elements in tree rings has a positive correlation with the automobile emission which became more and more serious with the fast rise in number of vehicle fleet. In recent years, exhausted gas contamination of vehicle becomes the main factor for air pollution in Xi' an city.%为了探讨树轮化学分析方法在城市环境污染研究方面的应用价值,研究了采集于西安市长安大学校园的树轮样品.用湿法消化和ICP法检测了树轮样品中S和Pb元素的含量.通过与西安市能源消耗及机动车辆保有数量对比分析,结果表明,云杉树轮中硫元素含量变化与西安市大气SO2污染关系密切；铅元素含量变化不仅与能源消耗有关,而且与机动车尾气排放污染环境关系更为密切.目前,汽车尾气排放污染已经成为西安市大气污染的主要因素.
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