Magnetism and Grain-Size Distribution of Particles Deposited on the Surface of Urban Trees in Lanzhou City, Northwestern China

Bo Wang, Xiaochen Zhang, Chenming Gu, Mei Zhang, Yuanhao Zhao and Jia Jia
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Bo Wang: College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China
Xiaochen Zhang: College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China
Chenming Gu: College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China
Mei Zhang: College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China
Yuanhao Zhao: College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China
Jia Jia: College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China

IJERPH, 2021, vol. 18, issue 22, 1-14

Abstract: Studies on the variation in the particulate matter (PM) content, Saturation Isothermal Remanent Magnetization (SIRM), and particle grain-size distribution at a high spatial resolution are helpful in evaluating the important role of urban forests in PM removal. In this study, the trees located in dense urban forests (T0) retained more PM than trees located in open spaces (T1–T4); the SIRM and PM weight of T0 were 1.54–2.53 and 1.04–1.47 times more than those of T1–T4, respectively. In addition, the SIRM and PM weight decreased with increasing distance to the road, suggesting that distance from pollution sources plays a key role in reducing the air concentration of PM. The different grain-size components were determined from frequency curve plots using a laser particle-size analyzer. A unimodal spectrum with a major peak of approximately 20 ?m and a minor peak between 0.1 and 1 ?m was observed, indicating that a large proportion of fine air PM was retained by the needles of the study trees. Additionally, more <2.5 ?m size fraction particles were observed at the sampling site near the traffic source but, compared to a tree in a row of trees, the percentage of the >10 ?m size fraction for the tree in the dense urban forest was higher, indicating that the particles deposited on the needle surface originating from traffic sources were finer than those from natural atmospheric dust. The exploration of the variation in the PM weight, SIRM, and grain size of the particles deposited on the needle surface facilitates monitoring the removal of PM by urban forests under different environmental conditions (e.g., in closed dense urban forests and in open roadside spaces), different distances to roads, and different sampling heights above the ground.

Keywords: PM pollution; urban forest; biomagnetic monitoring; grain-size distribution; environmental conditions (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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