Li Wan-Xin, Lu Rui, Xie Zheng-Sheng, Wang Jin-Long, Fan Chun-Lan, Liu Peng-Xia, Li Yan-Peng
School of Environmental Science and Engineering, Chang'an University, Xi'an 710054, China.
Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas, Ministry of Education, Chang'an University, Xi'an 710054, China.
Huan Jing Ke Xue. 2017 Nov 8;38(11):4494-4500. doi: 10.13227/j.hjkx.201703072.
The concentration and size distribution of culturable bacteria and fungi were studied in Xi'an city at various air quality levels. The culturable bioaerosols were collected by an Andersen bioaerosol aerosol sampler between Sept. 2014 and Jan. 2015. Principal component analysis and multiple linear regressions were applied to link the concentrations with meteorological conditions including ambient temperature and relative humidity, as well as the levels of air pollutants such as PM, PM, NO, SO and O. These measured results showed that the concentration of culturable bacteria and fungi were in the ranges of 97-1909 CFU·m and 92-1737 CFU·m, respectively. The concentrations of culturable bioaerosols increased along with a deterioration in air quality. The size distribution of the bacteria migrated to coarse particles. Fungal aerosols showed a normal distribution at low pollution levels, while for a high levels, they preferenced fine particles. Results from the principal component analysis (PCA) indicate that the concentration of culturable bioaerosols is mainly influenced by haze, solar radiation, and relative humidity. Multiple linear regression analysis showed that bacterial aerosol concentrations are positively correlated with haze (<0.05) and relative humidity, while no significant negative correlations with solar radiation exists. Fungal aerosol concentrations did not have significant positive correlations with haze, solar radiation, or relative humidity. The results of this study will provide basic data for evaluating the effects of bioaerosols on human health and the environment.
在西安市不同空气质量水平下，对可培养细菌和真菌的浓度及粒径分布进行了研究。2014年9月至2015年1月期间，使用安德森生物气溶胶采样器收集可培养生物气溶胶。应用主成分分析和多元线性回归将浓度与气象条件（包括环境温度和相对湿度）以及空气污染物水平（如PM、PM、NO、SO和O）联系起来。这些测量结果表明，可培养细菌和真菌的浓度分别在97 - 1909 CFU·m和92 - 1737 CFU·m范围内。可培养生物气溶胶的浓度随着空气质量的恶化而增加。细菌的粒径分布向粗颗粒迁移。真菌气溶胶在低污染水平下呈正态分布，而在高污染水平下则更倾向于细颗粒。主成分分析（PCA）结果表明，可培养生物气溶胶的浓度主要受雾霾、太阳辐射和相对湿度的影响。多元线性回归分析表明，细菌气溶胶浓度与雾霾（<0.05）和相对湿度呈正相关，而与太阳辐射不存在显著负相关。真菌气溶胶浓度与雾霾、太阳辐射或相对湿度均无显著正相关。本研究结果将为评估生物气溶胶对人类健康和环境的影响提供基础数据。
