空气中微生物的空间垂直分布状况

The space vertical distribution of microbes in the air

采用自然沉降法分别对郑州市2个不同功能区的空气微生物进行采样分析。结果表明,空气中微生物的数量与高度之间具有一定相关性,微生物的数量随着高度的增加而增多,到达一定高度后数量逐渐降低;具体表现为,某大学实验工程大楼的空气微生物在15 m时数量最多,为2 731 CFU·m-3;某三甲医院附近住宅楼在33m时微生物数量最多,为13 783 CFU·m-3。2个功能区空气中细菌、真菌、放线菌随着高度的增加,整体变化趋势相似,在同一高度上,真菌的数量均远远高于细菌和放线菌,放线菌的数量略高于细菌。该结果表明,在人员密集的区域,空气微生物的含量显著高于人员稀少的区域。

The natural sedimentation method was used for sampling and analysis of the air microbial of two different functional areas in Zhengzhou city. The results showed that the air microbial population was relevant to height. The microbe quantity increased in the first several floors,then decreased in the higher floors. The airborne microbes at the height of 15 m outside a certain university building reached its maximum of 2 731 CFUm^-3,while the maximum（ 13 783 CFUm^-3） of air microorganisms in the residential building close to a certain hospital was collected at the height of 33 m. The number of bacteria,fungi and actinomycetes changed with height and presented the similar trend. At the same height,the number of fungi was much higher than that of bacteria and actinomycetes,meanwhile the actinomyces quantity was slightly higher than that of bacteria. The results suggest that the airborne microorganism content in a crowded environment was significantly higher than that of sparsely populated areas.