Table 1. Percentage of overlapping genes and diversity indices of all functional genes in activated sludge samples.

sample	GBD_1	GBD_2	GBD_3	QH_1	QH_2	QH_3	XHM_1	XHM_2	XHM_3	XJH_1	XJH_2	XJH_3
GBD_1
GBD_2	84.67%
GBD_3	89.16%	86.65%
QH_1	69.41%	71.45%	71.96%
QH_2	67.39%	69.49%	69.22%	85.78%
QH_3	65.12%	68.03%	67.38%	81.68%	80.53%
XHM_1	79.10%	80.08%	81.10%	72.82%	69.85%	67.72%
XHM_2	75.56%	78.38%	77.87%	71.42%	68.90%	68.33%	85.82%
XHM_3	77.18%	78.64%	79.68%	74.95%	72.89%	71.38%	88.14%	82.43%
XJH_1	73.92%	77.03%	74.81%	71.96%	71.38%	71.08%	75.72%	76.30%	76.37%
XJH_2	74.11%	76.22%	74.91%	72.62%	72.29%	72.01%	74.94%	75.19%	76.71%	89.15%
XJH_3	67.12%	69.41%	67.89%	70.21%	71.17%	70.94%	67.74%	69.71%	69.96%	79.99%	80.27%
Richnessa	23064	22434	23554	20862	20610	19688	24268	22831	23413	20774	20838	18847
Hb	10.1	10.0	10.1	10.0	9.9	9.9	10.1	10.0	10.1	10.0	10.0	9.9
1/Dc	23301.2	22682.7	23805.7	21049.3	20777.9	19855.9	24452.9	23022.1	23624.7	20959.6	21033.5	18984.4
Evennessd	0.996	0.996	0.996	0.996	0.995	0.995	0.994	0.995	0.995	0.995	0.995	0.995

^aDetected gene number.

^bShannon–Weiner index, higher number represents higher diversity.

^cReciprocal of Simpson's index, higher number represents higher diversity.

^dEvenness index.