中文摘要：

55 常绿树树不到一年成长的叶子在北京的西方的郊区从 Shougang 工业区域被收集包括钢植物和它的周围的居住区域，娱乐公园和农田。岩石磁性和重金属内容被学习。叶样品的磁性被 low-coercivity 磁铁矿支配的结果表演，和集中和磁铁矿粒子的谷物尺寸逐渐地从主要污染来源增加与距离减少了。而且，在磁性的参数之间有一种重要线性关系(低地的磁性的危险性，浸透等温的残余的磁化和非滞后的残余的磁化) 并且重金属内容(Fe， Pb， V， Cr 和 Zn )(0.73 ⩽R⩽0.88 ) 。因此，叶子的磁性的参数能为最近的大气的金属性的污染的快检测用作一个代理。

英文摘要：

Fifty-five evergreen tree＇s leaves growing less than one year were collected from Shougang industrial area in western suburb of Beijing, including steel plants and its ambient residential areas, recreational parks and farmlands. Rock magnetic properties and heavy metal contents were studied. The results show that the magnetic properties of leaf samples are predominated by Iow-coercivity magnetite, and both the concentration and grain size of magnetite particles gradually decreased with the distance from the main pollution source increases. Moreover, there is a significant linear relationship between magnetic parameters （the low-field magnetic susceptibility, saturation isothermal remanent magnetization and anhysteretic remanent magnetization） and heavy metals contents （Fe, Pb, V, Cr and Zn） （0.73≤ R≤ 0.88）. Hence, the magnetic parameters of leaves can serve as a proxy for quick detecting of the recent atmospheric metallic pollution.