Table 1. Diversity indices of all functional genes in soil samples.

	DQ-U	DQ-C	YM-U	YM-C	CQ-U	CQ-C	SL-U	SL-C	JH-U	JH-C
Richnessa	177	145	349	380	1076	541	558	325	196	151
Hb	4.70	4.43	5.55	5.54	6.56	5.88	5.95	5.45	4.75	4.59
1/Dc	69.2	49.9	184.6	167.1	484.9	227.0	270.6	167.0	71.1	58.5
Evennessd	0.91	0.89	0.95	0.93	0.94	0.93	0.94	0.94	0.90	0.91

DQ, Daqing; YM, Yumen; CQ, Changqing; SL, Shengli; JH, Jianghan; U, uncontaminated; C, contaminated.

^aDetected gene number.

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

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

^dEvenness index.