title: [Concentration distribution of bioaerosol in summer and autumn in the Qingdao coastal region].
abstract: Bioaerosol samples were collected using an Andersen sampler from Jul. 2009 to Nov. 2009 in the Qingdao coastal region. Total microbe (including 'culturable microbe' and 'non-culturable microbe'), the terrigenous and marine microbe were analyzed by the counting methods of fluorescence microscope and Petri dishes containing agar media. The results showed that the proportion of non-culturable microbe to total microbe was as high as 99.58% of total on average, while the average proportion of culturable microbe to total microbe was 0.42%. The average proportions of marine bacteria/fungi did to the culturable microbe (18.99% and 45.47% respectively) were more than that of terrigenous bacteria/fungi (16.91% and 18.63% respectively), therefore marine bacteria/fungi contributed more to the microbe than terrigenous bacteria/fungi. It could be seen that the composition and concentration distribution were greatly affected by the ocean in the Qingdao coastal region. The average concentrations of total microbe were higher in Autumn (181 682.5 CFU/m3) than that in Summer (159 704.2 CFU/m3), and that of terrigenous bacteria, marine bacteria/fungi were also higher in Autumn than in Summer. The particle sizes of total microbe presented a log-normal distribution in summer and autumn, and the total microbe mainly existed in coarse particles larger than 2.1 microm. There was the highest proportion of total microbe in 3.3-4.7 microm particles, the lowest one in 0.65-1.1 microm. The terrigenous and marine bacterial particle sizes showed a skew distribution with a higher value in large particles (> 7 microm) and a lower one in fine particles (0.65-1.1 microm). The terrigenous and marine fungal particle sizes showed a log-normal distribution in summer and autumn, and the highest concentration proportion existed in particles with diameter of 2.1-3.3 microm.
authors.affiliation: Key Laboratory of Marine Environmental and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China. xwb14370743@126.com
authors.forename: Wen-Bing
authors.initials: WB
authors.lastname: Xu
authors.forename: Jian-Hua
authors.initials: JH
authors.lastname: Qi
authors.forename: Chuan
authors.initials: C
authors.lastname: Jin
authors.forename: Dong-Mei
authors.initials: DM
authors.lastname: Gao
authors.forename: Meng-Fei
authors.initials: MF
authors.lastname: Li
authors.forename: Lin
authors.initials: L
authors.lastname: Li
authors.forename: Shuai
authors.initials: S
authors.lastname: Huang
authors.forename: Hai-Dong
authors.initials: HD
authors.lastname: Zhang
mesh_terms: D000336:Aerosols / Q000032:analysis*; D000391:Air Microbiology; D000393:Air Pollutants / Q000032:analysis*; D002681:China; D004784:Environmental Monitoring / Q000379:methods; D009792:Oceans and Seas; D010316:Particle Size; D012621:Seasons
chemical_list: D000336:Aerosols; D000393:Air Pollutants