TABLE 2.

Statistical analysis of physicochemical parameters and amoA gene diversity

Parameter	Pearson moment correlationa
	OTU		Chao1		H′
	2%	5%	2%	5%	2%	5%
Temp (°C)	−0.21	−0.21	−0.33	−0.23	−0.25	−0.24
pH	−0.13	−0.13	0.13	−0.12	0.00	−0.05
ΣNH3	−0.07	−0.07	−0.07	−0.07	−0.09	−0.07
NO2−	0.52	0.57	0.14	0.40	0.63*	0.69*
NO3−	0.55*	0.50*	0.88*	0.70*	0.45*	0.47*
NO2− + NO3−	0.53*	0.49*	0.87*	0.69*	0.39*	0.49*
NO2− + NO3−/ΣNH3	0.22	0.26	0.19	0.24	0.33	0.35
ΣS2−	−0.13	−0.12	−0.08	−0.16	−0.34	−0.21

^aPearson moment correlation (r) was determined by using the following equation: . Asterisks denote a P of <0.05, which is typically regarded as significant, as determined by Excel function TDIST from the t value given by the following equation: . The number of samples is given by n.