To understand the relationship between microbes and greenhouse gases, four soil cores dominated by Calamagrostis angustifolia were investigated to determine bacterial community as well as the production and consumption of methane (CH_4), carbon dioxide (CO_2) and nitrous oxide (N_2O) after 45 days incubation in an open area. Aerobic and anaerobic microorganisms were counted to evaluate the bacterial community, and the results suggested a significantly negative correlation between the aerobic and anaerobic. ...