SEASONAL VARIATION IN CARBON METABOLISM CHARACTERISTICS AND FUNCTIONAL DIVERSITY OF AIR MICROBIAL COMMUNITIES IN LANZHOU

摘要

The Metabolic functional diversity of airborne microbial communities and its relationship with environmental factors at different functional regions Scenic Area (SA), Main Traffic Line (MTL), Pub- lic Service Area (PSA), Culture and Education Area (CEA) in Lanzhou were analyzed using Biolog- ECO technique and Redundancy Analysis (RDA) method. This Research study shows that, there were seasonal differences in carbon metabolism process- es among the airborne microbes located in the four functional regions. SA airborne microbial carbon metabolism process was higher in spring and sum- mer, while that of MTL and PSA was higher in autumn and winter. The CEA airborne microbial carbon metabolism process was higher in winter while its summer and autumn airborne carbon me- tabolism process had little differences. In each functional area, Shannon and Simpson index values among the Seasonal airborne microbes were rela- tively insignificant, indicating that microbial com- munity richness and dominance of the same func- tional area did not experience significant seasonal changes. However, McIntosh index value showed a significant seasonal difference, which is an indica- tion that the airborne microbial community of the same functional area was affected by environmental and atmospheric seasonal changes. The four func- tional areas showed seasonal differences in carbon metabolism process. Carbohydrates were the main cause of the seasonal variation noticed in SA and PSA airborne microbial community carbon metabo- lism process while amino acids were the major ones responsible for seasonal variation among the MTL and PSA airborne microbial community carbon metabolism process. The functional diversity of microbial communities was closely related to envi- ronmental factors.