ABSTRACT

Fugitive dust is an important source of particulate matters (PM) emission in the air. Vegetation barriers (VBs) can be an effective way to mitigate PM from fugitive dust sources. It is meaningful to choose appropriate plants to establish VBs that can efficiently capture PM from various sources. This study was conducted to establish comparable and repeatable conditions to evaluate the capability of different VB species in mitigating PM emission from certain fugitive dust source. The airflow around two VBs and their PM interception mechanism was studied in a wind tunnel with simulated PM emission source of animal feeding operations. The species used for the two VBs were conifers represented by Pinus Sylvestris var. mongolica Litv. (PS) and the broad-leaved species represented by Syringa Oblate Lindl. (SOL). The results showed that the interception efficiency of the PS vegetation barrier was only slightly lower than that of SOL vegetation, while the PS had a lower effect on the wind speed at the similar leaf surface area. On the other hand, there were a large number of disordered “ridged” stripes on the microscopic structure of the hydrophilic leaves of SOL and PS, and a large amount of fine particles deposited on the leaves were observed, indicating that the microscopic geometric surface structure increased the deposition efficiency of the particles. These findings help to better understand the potential of tree species to reduce PM in environments.

Implications: To evaluate the capability of different VB species in mitigating PM emission from certain fugitive dust source, airflow around the two VBs and their PM interception mechanisms were studied in wind tunnels with comparable and repeatable conditions. The results showed that the interception efficiency of the Pinus Sylvestris var. mongolica Litv. (PS) was only slightly lower than that of the Syringa Oblate Lindl. (SOL) vegetation, while the PS had a lowering effect on the wind speed at the same low leaf surface area. Microscopic analysis of leaves surface indicated that the microscopic characteristics increased the deposition efficiency of the particles.

摘要

扬尘是空气中颗粒物（PM）排放的重要来源。植被屏障（VB）可以成为减轻来自扬尘源的PM的有效方法。选择合适的工厂来建立可以有效捕获各种来源的PM的VB是很有意义的。进行这项研究是为了建立可比较和可重复的条件，以评估不同VB物种缓解某些逃逸性粉尘源的PM排放的能力。在风洞中研究了两个VB周围的气流及其PM拦截机制，并模拟了动物饲养过程中PM的排放源。用于两个VB的物种是以Pinus Sylvestris var为代表的针叶树。蒙古自治州 （PS）和以丁香小扁豆Lindl为代表的阔叶树种。（SOL）。结果表明，PS植被屏障的截留效率仅略低于SOL植被，而PS对相同叶表面积下的风速影响较小。另一方面，在SOL和PS的亲水性叶片的微观结构上有大量无序的“脊状”条纹，并且观察到大量细小颗粒沉积在叶片上，表明微观的几何表面结构增加了颗粒的沉积效率。这些发现有助于更好地了解树木减少环境中PM的潜力。SOL和PS亲水叶片的微观结构上有大量无序的“脊状”条纹，并且观察到大量细小颗粒沉积在叶片上，表明微观的几何表面结构增加了硅的沉积效率。颗粒。这些发现有助于更好地了解树木减少环境中PM的潜力。SOL和PS亲水叶片的微观结构上有大量无序的“脊状”条纹，并且观察到大量细小颗粒沉积在叶片上，表明微观的几何表面结构增加了硅的沉积效率。颗粒。这些发现有助于更好地了解树木减少环境中PM的潜力。

含义：为了评估不同VB物种缓解某些逃逸性粉尘源的PM排放的能力，在具有可比较和可重复条件的风洞中研究了两个VB周围的气流及其PM拦截机制。结果表明，樟子松的截留效率较高。蒙古自治州 （PS）仅比丁香小扁豆Lindl的稍低。（SOL）植被，而PS在相同的低叶表面积下对风速有降低作用。叶片表面的微观分析表明，微观特征提高了颗粒的沉积效率。