Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan; National Institutes of Biomedical Innovation, Health and Nutrition, 7-6-8 Asagi, Saito, Ibaraki, Osaka 567-0085, Japan.
College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.
J Environ Sci (China). 2018 Oct;72:133-139. doi: 10.1016/j.jes.2017.12.019. Epub 2018 Jan 4.
Aeolian dust particles arising from arid and semiarid zones are known to carry microbes by air currents. The effect of wind-borne bacteria on atmospheric bacterial population at various downwind distances from the dust source regions must be clarified, but has not yet been reported. This study monitored the bacterial abundance and community composition in outdoor aerosol samples in Beijing, China, which is close to the Asian dust source regions, and compared them with the results obtained in a distant region (Osaka, Japan). The Asian dust collected in Beijing contained (4±3)×10bacterial cells/m, approximately 4 times higher than in Osaka. On 15 April 2015, Beijing experienced severe Asian dust events with a 1000-fold increase in bacterial abundance, relative to non-Asian dust days. Dominant bacterial phyla and classes in Asian dust collected in Beijing were Actinobacteria, Bacilli and Acidobacteria, and the bacterial community composition varied more widely than in Osaka. The bacterial community compositions differed between the Beijing and Osaka dusts, even for the same Asian dust events. These results indicated that aerosol bacterial communities nearer the dust source are more affected by eolian dust than their distant counterparts.
来自干旱和半干旱地区的风成尘埃颗粒已知通过气流携带微生物。必须阐明携带细菌的风成细菌对尘埃源区各个下风距离处大气细菌种群的影响，但尚未有报道。本研究监测了中国北京（接近亚洲尘埃源区）户外气溶胶样本中的细菌丰度和群落组成，并将其与在遥远地区（日本大阪）获得的结果进行了比较。在北京收集的亚洲尘埃中含有（4±3）×10 个细菌细胞/m，大约是大阪的 4 倍。2015 年 4 月 15 日，北京经历了严重的亚洲尘埃事件，细菌丰度相对于非亚洲尘埃日增加了 1000 倍。在北京收集的亚洲尘埃中优势的细菌门和纲为放线菌门、芽孢杆菌纲和酸杆菌纲，其细菌群落组成比在大阪的变化范围更广。即使是在同一亚洲尘埃事件中，北京和大阪尘埃的细菌群落组成也不同。这些结果表明，更接近尘埃源的气溶胶细菌群落受风成尘埃的影响比遥远的尘埃源的气溶胶细菌群落更大。
