| 上海市公园绿地树叶对大气重金属污染的磁学响应 |
| 摘要点击 2314 全文点击 1354 投稿时间：2015-04-25 修订日期：2015-07-20 |
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| 中文关键词 磁参数 重金属 树叶 公园 污染 |
| 英文关键词 magnetic parameters heavy metals tree leaves parks pollution |
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| 中文摘要 |
| 为探究城市公园绿地树叶对大气重金属污染的磁学响应,按照上海市年均主导风设置纵横两个采样断面,采集城郊区公园绿地中广泛分布的香樟树叶,进行岩石磁学和重金属元素分析. 结果表明,样品磁性矿物以亚铁磁性矿物为主导,磁性颗粒物的含量和粒径由典型工业区沿冬季风方向逐级递减. 对叶片进行超声清洗后磁化率下降63%~90%,即样品的磁性特征主要取决于叶表附尘. 树叶重金属元素Fe、Mn、Zn、Cu、Cr、V、Pb含量与磁参数显著相关(0.442≤R≤0.799, P<0.05),说明城市公园绿地树叶磁参数可以作为大气重金属污染的替代指标. 运用多元统计分析方法表明,研究区树叶磁性矿物及重金属含量主要受工业活动和交通道路污染的复合影响. |
| 英文摘要 |
| To reveal the magnetic response to the atmospheric heavy metal pollution in leaves along urban parks, Camphor leaf samples, widely distributed at urban parks, were collected along the year leading wind direction of Shanghai, by setting two vertical and horizontal sections, using rock magnetic properties and heavy metal contents analysis. The results showed that the magnetic minerals of samples were predominated by ferromagnetic minerals, and both the concentration and grain size of magnetite particles gradually decreased with the winter monsoon direction from the main industrial district. A rigorous cleaning of leaves using ultrasonic agitator washer could remove about 63%-90% of low-field susceptibility values of the leaves, and this strongly indicated that the intensity of magnetic signal was mainly controlled by the PMs accumulated on the leaves surfaces. Moreover, there was a significant linear relationship between heavy metals contents (Fe, Mn, Zn, Cu, Cr, V and Pb) and magnetic parameters (0.442≤R≤0.799, P<0.05), which suggested that magnetic parameters of urban park leaves could be used as a proxy for atmospheric heavy metal pollution. The results of multivariate statistical analysis showed that the content of magnetic minerals and heavy metal indust-loaded tree leaves was affected by associated pollution of industry and traffic. |
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