Fig. 2. Abundances of bacteria, archaea, ammonia-oxidizing bacteria (AOB) and archaea (AOA) in soils after the third season of wheat harvested, as detected by real-time PCR.
CK is the untreated soil; CF is the soil treated with inorganic nitrogen; CP is the soil treated with manure-based compost. A: bacteria; B: archaea; C: AOB; D: AOA. Error bars
represent the standard error of the mean and different letters indicate statistically different numbers between treatments (p < 0.05).