植物叶片滞尘磁性特征及其对道路交通衍生颗粒物污染的指示  

Magnetic characteristics of leaf-deposited particles and indications for road traffic derived particle pollution

作　　者：顾晨铭 王博 孙小涵 李怡莹 张秀秀 贾佳 张俊辉[2] GU ChenMing;WANG Bo;SUN XiaoHan;LI YiYing;ZHANG XiuXiu;JIA Jia;ZHANG JunHui(College of Geography and Environmental Sciences,Zhejiang Normal University,Jinhua Zhejiang 321004,China;College of Geography and Environment,Baoji University of Arts and Sciences,Baoji Shaanxi 721000,China)

机构地区：[1]浙江省流域环境数智监测与修复重点实验室,浙江师范大学地理与环境科学学院,浙江金华321004 [2]陕西省灾害监测与机理模拟重点实验室,宝鸡文理学院地理与环境学院,陕西宝鸡721013

出　　处：《地球物理学报》2025年第4期1417-1429,共13页Chinese Journal of Geophysics

基　　金：浙江省自然科学基金资助项目(LY20D040001)资助。

摘　　要：选取杭州市开放道路旁不同配置模式的刺柏为研究对象,对叶表滞尘磁性特征进行系统分析,探究其对交通排放颗粒物扩散及影响因素的指示意义.研究结果显示,叶表滞尘磁性特征均以低矫顽力的假单畴和多畴亚铁磁性矿物为主导.采样方位、树体配置模式和降水均是影响叶片滞尘磁性含量的重要因素.就采样方位而言,不同配置树体面向道路一侧叶片滞尘磁性矿物含量均显著高于其他方向.就树种配置而言,成排树在垂直方向上表现出更强的颗粒物滞留能力,并将颗粒物聚集在更低的高度范围(<2.2 m)内.水平方向上,无论在降水前后,成排树背向道路侧叶片滞尘磁性矿物含量相对于面向道路侧的降低率均高于单株树,表明成排树起到了更有效的绿色屏障作用.降水对成排树面向道路侧2.4 m以上高度的叶表滞尘磁性颗粒去除较为明显,而对单株树中不同高度层颗粒物的去除率则相近.本研究强调了植物环境磁学在快速评估植被配置与降水对交通排放颗粒物过滤和清洁效果方面的潜力,为杭州市交通污染的缓解以及相关政策的制定提供了科学依据.This study focuses on the analysis of the magnetic properties of dust deposited on the leaves of Juniperus formosana Hayata in different tree configurations along an open road in Hangzhou.The objective is to investigate its indicative significance on the diffusion of traffic-emitting particulate matter(PM)and influencing factors.The results show that the magnetic properties of the dust were predominantly characterized by lowcoercivity pseudo-single domain(PSD)and multidomain(MD)ferromagnetic minerals.Sampling directions,tree configurations,and precipitation were all important factors influencing magnetic mineral contents of the dust.In terms of sampling directions,magnetic mineral content of the dust was significantly higher on the side facing road of the tree body in different configurations than in the other directions.In terms of tree configurations,row of trees showed greater PM retention capacity in the vertical direction,and concentrated PM in a lower height range(<2.2 m)than single tree.In the horizontal direction,compared with the side facing road,the decreased rate of the magnetic mineral contents of the dust of row of trees in the opposite direction before and after precipitation was higher than that of single tree,indicating that row of trees acts as a more effective green barrier.Precipitation removed magnetic particles at heights above 2.4 m on the side facing the road of row of trees more significantly,whereas the removal of magnetic particles at different height layers in single tree was similar.This study emphasizes the potential of plant environmental magnetism in rapidly assessing the effectiveness of tree configuration modes and precipitation in filtering and cleaning traffic-emitting PM.It provides a scientific basis for mitigating traffic pollution in Hangzhou and formulating relevant policies.

关 键 词：植物磁学监测 叶片 交通颗粒物 树种配置 杭州 

分 类 号：P318[天文地球—固体地球物理学]