| 兰州市叶面尘磁性与黑碳特征对大气污染的响应 |
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| 引用本文： | 王博,陈红,夏敦胜,李刚,马珊,刘慧.兰州市叶面尘磁性与黑碳特征对大气污染的响应[J].中国环境科学,2019,39(8):3178-3185. |
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| 作者姓名： | 王博 陈红 夏敦胜 李刚 马珊 刘慧 |
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| 作者单位： | 1. 浙江师范大学地理与环境科学学院, 浙江 金华 321004;2. 兰州大学资源环境学院西部环境教育部重点实验室, 甘肃 兰州 730000;3. 中国气象局兰州干旱气象研究所/甘肃省干旱气候变化与减灾重点实验室/中国气象局干旱气候变化与减灾重点开放实验室, 甘肃 兰州 730020 |
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| 基金项目： | 国家自然科学基金青年基金资助项目（41504056）；甘肃省科技支撑计划项目（1604FKCA096）；中国博士后科学基金资助项目（2015M580892，2017T100785） |
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| 摘 要： | 通过采集兰州市不同功能区小叶黄杨和刺柏叶片样品，对叶片表面滞尘量、叶表颗粒物磁性特征和黑碳（EC）浓度进行系统分析，探究其对周围大气污染的响应.结果显示，小叶黄杨和刺柏叶表颗粒物磁性特征以低矫顽力的亚铁磁性矿物为主导，磁晶体粒径以假单畴（PSD）颗粒为主.交通区小叶黄杨和刺柏饱和等温剩磁（SIRM）（489.40×10-6A，290.73×10-5A·m2/kg）显著高于公园（99.56×10-6A，74.00×10-5A·m2/kg）和生活区（61.91×10-6A，209.79×10-5A·m2/kg），表明SIRM明显受到周围环境中污染物浓度的影响.小叶黄杨和刺柏叶表颗粒物亚铁磁性矿物浓度与黑碳浓度的高值分布区域在空间上具有一致性，并且二者高度相关（r=0.94，0.94；P<0.0001），表明二者来源具有一致性.同时，不同采样高度不同树种叶片磁性对叶表颗粒物中黑碳浓度均有稳定的指示性，进一步表明叶表颗粒物SIRM可以作为指示叶表颗粒物黑碳污染的重要磁学参数.以城市绿化植物叶片为载体的环境磁学研究可实现颗粒物污染高空间分辨率的环境友好型监测.
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| 关 键 词： | 叶面尘 黑碳 磁学特征 大气污染 兰州市 |
| 收稿时间： | 2018-12-27 |
On the magnetic characteristic of leaf-deposited particles and element carbon and its response to air pollution |
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| WANG Bo,CHEN Hong,XIA Dun-sheng,LI Gang,MA Shan,LIU Hui.On the magnetic characteristic of leaf-deposited particles and element carbon and its response to air pollution[J].China Environmental Science,2019,39(8):3178-3185. |
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| Authors: | WANG Bo CHEN Hong XIA Dun-sheng LI Gang MA Shan LIU Hui |
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| Abstract: | In order to explore the characteristic of magnetic and element carbon (EC) of the particles on the surface of leaf and their response to ambient atmospheric pollution, the weight of leaf deposited particles, magnetism and concentration of particles on the surface of leaf were measured which collected from Buxus sinica and Juniperus formosana in different functional areas of Lanzhou city. The results of magnetic parameters suggested that the magnetic characteristics of leaf deposited particles in traffic area were dominated by ferrimagnetic minerals with low coercivity, and the grain size was dominated by pseudo single domain (PSD) particles. The SIRM of Buxus sinica and Juniperus formosana in traffic area (489.40×10-6A, 290.73×10-5A·m2/kg, respectively) are higher than that in park (99.56×10-6A, 74.00×10-5A·m2/kg, respectively) and residential area (61.91×10-6A, 209.79×10-5A·m2/kg). and the spatial distribution of EC in line with SIRM,showed that SIRM were significantly influenced by the sources and concentration of pollutants in ambient environment. A significant correlation(r=0.94,0.94;P<0.0001) was observed between SIRM and EC, indicated that SIRM can effectively respond to the dust retention and element carbon concentration of particles on the leaf surface, and it can be used as an effective magnetic parameter to indicate the particulate pollution on the surface of leaf and then reflect the ambient atmospheric pollution. Environmental magnetic research with urban green plant leaves as the carrier can achieve environmental-friendly monitoring with high spatial resolution of particulate pollution |
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| Keywords: | leaf deposited particles element carbon magnetic characteristics atmospheric pollution Lanzhou City |
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