| 城市道路绿化带不同植物叶片附尘对大气污染的磁学响应 |
| 摘要点击 1334 全文点击 1268 投稿时间：2012-02-07 修订日期：2012-07-03 |
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| 中文关键词 道路 绿化带 常绿植物 叶片附尘 磁学 重金属 上海 |
| 英文关键词 road greenbelt evergreen tree species dust-loaded tree leaves magnetism heavy metals Shanghai |
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| 中文摘要 |
| 对上海市金沙江路两侧绿化带内24个常绿植物叶片样品进行了磁性与重金属测试,以探讨城市道路绿化带不同植物叶片附尘对大气污染的磁学响应. 结果表明,χ、SIRM值分别在(4~59)×10-8 m3·kg-1和(496~6114)×10-6 Am2·kg-1之间变化,S-300 mT在89%~98%之间变动. 所有植物样品中χARM/χ<4, χARM/SIRM<30×10-5 mA-1. 磁性参数表明,植物叶片附尘以亚铁磁性矿物为主,磁性矿物颗粒以假单畴(PSD)-多畴(MD)为主. 重金属元素Zn、Cu、Pb含量与反映亚铁磁性矿物含量的χ、SIRM、χARM呈显著正相关,可以将磁性参数SIRM作为叶片重金属元素的替代指标. 推荐在上海地区广泛种植的广玉兰作为道路植物污染的指示植物. |
| 英文摘要 |
| To reveal the magnetic response to atmospheric particulate pollution in tree leaves along urban streets, twenty-four evergreen tree leaves were collected from green belt along Jinshajiang road, Shanghai, which were subjected to magnetic and heavy metals (Zn, Cu, Pb) analyses. The result revealed that in all leaf samples χ, SIRM varied in ranges of (4-59)×10-8 m3·kg-1 and (496-6114)×10-6 Am2·kg-1, respectively, S-300mT varied from 89% to 98% and χARM/χ<4, χARM/SIRM<30×10-5 mA-1 was found. The magnetic parameters showed that ferromagnetic/ferrimagnetic particles were the main magnetic carriers in dust-loaded tree leaves, and magnetic grains were predominantly pseudo-single domain (PSD) and multidomain (MD) in size. The significant positive correlation between heavy metals (Zn, Cu, Pb) contents and χ, SIRM, χARM, suggested that magnetic parameters like SIRM could be used as a proxy for heavy metal contents. We recommend that Magnolia grandiflora, widely distributed in Shanghai, can be used for particulate pollution monitoring. |
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