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首页> 外文期刊>The Science of the Total Environment >Comparison of chemical composition and airborne bacterial community structure in PM_(2.5) during haze and non-haze days in the winter in Guilin, China
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Comparison of chemical composition and airborne bacterial community structure in PM_(2.5) during haze and non-haze days in the winter in Guilin, China

机译：桂林冬季阴霾与非阴霾日PM_（2.5）的化学组成与空气传播细菌群落结构比较

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摘要

Haze is a typical type of air pollution and frequently has occurred in the winter in Guilin city recently, but information relating to chemical compositions and airborne bacterial community structure of atmospheric particulate matter (PM2.5) during haze days remains very limited. In this study, the PM2.5 concentration, chemical components including water-soluble ions and metal elements, and bacterial community compositions of PM2.5 on both haze and non-haze days were characterized, and the relationships between them were studied. The results showed that levels of the secondary aerosol particles of SO42-, NO3-, and NH4+ in haze PM2.5 associated with local fuel combustion and vehicle emissions were significantly higher than non-haze samples. Similar trends were observed for the detected trace metal elements. High-throughput sequencing results indicated that higher PM2.5 concentration caused lower bacterial richness and diversity. However, the airborne bacterial community structure remained stable, and no significant difference was found between haze and non-haze PM2.5. Firmicutes, Proteobacteria, and Bacteroidetes were the most abundant phyla accounting for a total of 97.2% on average. In contrast to non-haze PM2.5, the bacterial community structure of haze PM2.5 was mostly positively correlated with SO42-, NO3-, NH4+, K+, and Cl-, suggesting these secondary aerosol particles were probably of great importance on haze pollution and variability of the bacterial compositions of PM2.5. (C) 2018 Elsevier B.V. All rights reserved.
机译：霾是典型的空气污染类型，最近在桂林市冬季经常发生，但有关霾天气中大气颗粒物（PM2.5）的化学成分和空气传播细菌群落结构的信息仍然非常有限。本研究对雾霾天和非雾霾天的PM2.5浓度，包括水溶性离子和金属元素的化学成分以及细菌群落组成进行了表征，并研究了它们之间的关系。结果表明，与局部燃料燃烧和车辆排放相关的雾霾PM2.5中，SO42-，NO3-和NH4 +的二次气溶胶颗粒水平显着高于非雾霾样品。对于检测到的痕量金属元素，观察到相似的趋势。高通量测序结果表明，较高的PM2.5浓度导致较低的细菌富集度和多样性。然而，空气传播的细菌群落结构保持稳定，雾度和非雾度PM2.5之间没有发现显着差异。 Firmicutes，Proteobacteria和Bacteroidetes是最丰富的门，平均总计占97.2％。与非雾霾PM2.5相比，雾霾PM2.5的细菌群落结构与SO42-，NO3-，NH4 +，K +和Cl-主要呈正相关，表明这些次级气溶胶颗粒可能对雾霾具有重要意义。 PM2.5细菌组成的污染和变异性。 （C）2018 Elsevier B.V.保留所有权利。

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