Culturable airborne bacteria in outdoor environments in Beijing, China
Culturable airborne bacteria in outdoor environments in Beijing, China
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DOI：
10.1007/s00248-007-9216-3
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发表时间：
2007-10-01
影响因子：
3.6
通讯作者：
Hu, Lifeng
中科院分区：
文献类型：
--
作者：
Fang, Zhiguo;Ouyang, Zhiyun;Hu, Lifeng
气载细菌是生物气溶胶的重要生物成分，在生态系统中发挥着重要作用。空气中高浓度的细菌会导致生物空气污染和各种疾病。本研究对北京市区三个采样点的空气中可培养细菌进行了为期一年的系统调查。结果表明，可培养细菌的浓度范围为71个菌落形成单位(Cfu)/m(3)至22,100 cfu/m(3)，平均为2,217 cfu/m~3。在人类活动丰富的地点(RCEES)和高流量地点(XZM)的细菌浓度实际上是相同的。它们明显高于绿地(BBG)。不同季节RCEES和XZM细菌浓度差异较大，夏秋两季浓度较高。在一天中，所有采样点在13：00小时检测到明显较低的浓度。本研究共鉴定出可培养细菌47属165种。微球菌是最主要的细菌群之一，约占细菌总数的20%-30%，其次是葡萄球菌、芽孢杆菌、棒状杆菌和假单胞菌。浓度百分比较高的细菌种类为黄色微球菌和玫瑰色微球菌。
Airborne bacteria are important biological components of bioaerosol and play an important role in ecosystem. Bacteria at a high concentration in the atmosphere can result in biological air pollution and all kinds of diseases. In this study, a systematical survey on the culturable airborne bacteria was carried out for 1 year at three sites in Beijing urban area. Results showed that concentrations of culturable bacteria ranged from 71 colony forming units (CFU)/m(3) to 22,100 CFU/m(3), and the mean was 2,217 CFU/m3. Bacterial concentrations at the human activity-enriched site (RCEES) and the highly trafficked site (XZM) were virtually the same point. They were significantly higher than those at the greener site (BBG). Significant variation in bacterial concentrations in different seasons was observed at RCEES and XZM with higher concentrations in summer and autumn. In a single day, significantly lower concentrations were detected at 13: 00 hours through all sampling sites. In this study, 165 species in 47 genera of culturable bacteria were identified. Micrococcus was one of the most dominant bacterial groups and contributed to approximately 20 similar to 30% of the total bacterial concentration, followed by Staphylococcus, Bacillus, Corynebacterium, and Pseudomonas. The bacterial species with a high concentration percentage included Micrococcus luteus and Micrococcus roseus.