In order to study the effects of nitrogen addition on soil microbial metabolic characteristics, the metabolic activity and the diversity of soil microbial community were determined by four kinds of plates(BIOLOG AN, FF, GenlII and YT plates)with different nitrogen treatments on Cinnamomum camphora forest in Hunan Botanical Garden. The results show that (1) a high concentration of nitrogen promoted metabolic function of soil microbial anaerobic bacteria, and low nitrogen concentration inhibited its activity; (2) For the soil microbial gram...