江苏泰州城市霾天和沙尘天气溶胶中细菌群落结构特征研究

近年来,空气污染已成为长三角地区最关键的环境问题之一,气溶胶颗粒物(PM)是最主要的污染物之一.生物气溶胶作为颗粒物的重要组成部分,可能对空气质量和人体健康产生不利影响.利用高通量测序方法研究了江苏省泰州2019年11月至2020年1月期间发生沙尘和霾污染时生物气溶胶中细菌群落结构组成特征.结果表明:冬季沙尘天和霾天气...

Airborne Bacterial Community Characteristics During Dust and Haze Days in Taizhou City of Jiangsu Province

In recent years,air pollution has become one of the most critical environmental issues in the Yangtze River Delta region,with particular matter (PM) being one of the top pollutants.As an important fraction of PM,bioaerosols may have adverse effects on air quality and human health.Airborne bacterial community characteristics during dust and haze days from Nov.2019 to Jan.2020 in Taizhou City were studied using Illumina high-throughput sequencing.The results showed that the bacterial community structure and diversity in bioaerosols varied significantly when the dust and haze occurred in winter.In haze days,the diversity,evenness and evolution-based diversity of airborne bacteria were significantly higher than good days in summer,the difference among particle sizes was also increased.In dust days,change in bacterial community structure was just the opposite of haze days,not only the abundance of airborne microorganisms decreased,but also the diversity and evenness decreased.In good days,the bacterial community composition and dominant species between coarse particles and fine particles were relatively similar.During dust and haze event,the differences of bacterial composition between coarse particles and fine particles increased,the species and relative abundance of pathogenic bacteria were also obviously increased,the increased concentration of pathogenic bacteria in dominant groups were Pseudomonas,Ralstonia,Enterococcus,Bacteroides,Escherichia-Shigella,Streptococcus,which may bring potential health risks to human,animal and agricultural production activities.Based on abundance heatmap analysis of the bacterial community structure similarity of different particle sizes in polluted days,most of the particle sizes were clustered together in dust days,which indicated that the high similarity in the bacterial composition among particle sizes.In general,the particle sizes samples of the haze days were scattered,and the particle size difference increased with the increased pollution.