Table 3.

Distribution of denitrifying bacteria functional genes and Shannon-Wiener index with evenness at different FRs.

Filling rate	20%	30%	40%	50%
narG abundance (copies/g-SS)	2.76 × 107	1.00 × 108	2.78 × 108	2.89 × 108
nosZ abundance (copies/g-SS)	7.66 × 104	1.74 × 107	2.15 × 107	2.42 × 107
Shannon-Wiener index (H′)	0.4	1.9	1.3	1.6
Evenness (E′)	0.6	0.9	0.9	1.0