Table 1 Pearson’s correlation coefficients of DNRA rate, nrfA gene abundance, diversity index and environmental parameters (n = 5 for nrfA gene abundance and DNRA rate; n = 4 for Chao1 and Shannon).

	Salinity	pH	DO	NH₄ ⁺	NO₃ ⁻	Moisture content	Organic carbon	Extractable NH₄ ⁺
Coefficients
nrfA gene abundance	−0.722	0.914	0.872	−0.612	0.657	0.626	0.802	0.627
DNRA rate	−0.638	0.654	0.459	−0.283	0.588	0.977	0.979	0.974
Chao1	−0.891	0.841	0.845	−0.905	0.974	0.782	0.907	0.629
Shannon	−0.255	0.082	−0.189	0.549	0.084	0.455	0.285	0.680
P values
nrfA gene abundance	0.169	0.030	0.054	0.273	0.228	0.259	0.103	0.258
DNRA rate	0.246	0.232	0.437	0.644	0.297	0.004	0.004	0.005
Chao1	0.109	0.159	0.155	0.095	0.026	0.218	0.093	0.371
Shannon	0.745	0.918	0.811	0.451	0.916	0.545	0.715	0.320

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