Table 1 Pearson correlation matrix (2-tailed) between dominant phyla and parameters of soil MFCs.

From: Salinity and Conductivity Amendment of Soil Enhanced the Bioelectrochemical Degradation of Petroleum Hydrocarbons

Index	I	Q	Rs	Rct	pH	EC	DHA	PPO	TPH	Alkane	PAH
I ^a	1
Q ^a	0.976^*	1
Q ^a	0.024	1
Rs^a	−0.081	−0.226	1
Rs^a	0.919	0.774	1
Rct^a	−0.433	−0.574	0.925	1
Rct^a	0.567	0.426	0.075	1
pH^b	0.338	0.23	−0.32	−0.298	1
pH^b	0.662	0.770	0.680	0.702	1
EC^b	0.592	0.533	0.663	0.335	0.162	1
EC^b	0.408	0.467	0.337	0.665	0.702	1
DHA^b	−0.839	−0.76	−0.461	−0.096	0.111	0.334	1
DHA^b	0.161	0.240	0.539	0.904	0.793	0.419	1
PPO^b	−0.891	−0.967^*	0.332	0.664	0.17	0.063	0.765^*	1
PPO^b	0.109	0.033	0.668	0.336	0.687	0.882	0.027	1
TPH^b	0.982^*	0.993^**	−0.113	−0.478	−0.004	−0.403	−0.764^*	−0.788^*	1
TPH^b	0.018	0.007	0.887	0.522	0.992	0.323	0.027	0.020	1
Alkane^b	0.909	0.945	−0.016	−0.393	−0.063	−0.514	−0.887^**	−0.724^*	0.930^**	1
Alkane^b	0.091	0.055	0.984	0.607	0.882	0.192	0.003	0.042	0.001	1
PAH^b	0.919	0.950^*	−0.013	−0.391	−0.211	−0.535	−0.867^**	−0.772^*	0.940^**	0.966^**	1
PAH^b	0.081	0.050	0.987	0.609	0.616	0.172	0.005	0.025	0.001	0.000	1
Pro ^b	0.451	0.282	0.833	0.607	0.106	0.387	−0.294	−0.093	0.07	0.053	−0.013
Pro ^b	0.549	0.718	0.167	0.393	0.803	0.344	0.480	0.827	0.870	0.901	0.976
Bac ^b	−0.632	−0.718	−0.091	0.241	0.196	−0.578	0.172	0.432	0.04	0.062	0.101
Bac ^b	0.368	0.282	0.909	0.759	0.642	0.133	0.684	0.286	0.926	0.884	0.812
Fir ^b	−0.192	0.025	−0.737	−0.669	−0.196	−0.356	0.009	−0.204	0.229	0.29	0.28
Fir ^b	0.808	0.975	0.263	0.331	0.643	0.386	0.983	0.627	0.585	0.486	0.501
Nor ^b	−0.14	−0.206	−0.458	−0.252	0.621	0.556	0.553	0.362	−0.572	−0.671	−0.681
Nor ^b	0.860	0.794	0.542	0.748	0.100	0.152	0.155	0.378	0.139	0.068	0.063
Aci ^b	−0.55	−0.58	−0.419	−0.091	−0.164	0.156	0.282	0.11	−0.54	−0.58	−0.431
Aci ^b	0.450	0.420	0.581	0.909	0.697	0.712	0.498	0.795	0.167	0.132	0.286
Chl ^b	−0.46	−0.306	−0.845	−0.6	−0.095	0.454	0.485	0.089	−0.627	−0.671	-0.595
Chl ^b	0.540	0.694	0.155	0.400	0.823	0.258	0.223	0.833	0.096	0.068	0.120
Gem ^b	0.535	0.378	0.016	−0.074	0.033	0.272	0.331	0.052	−0.222	−0.487	−0.318
Gem ^b	0.465	0.622	0.984	0.926	0.938	0.515	0.423	0.904	0.597	0.221	0.442
Pla ^b	−0.415	−0.596	0.445	0.648	−0.168	0.352	0.245	0.209	−0.584	−0.625	−0.503
Pla ^b	0.585	0.404	0.555	0.352	0.690	0.392	0.558	0.619	0.129	0.098	0.204
Cya ^b	−0.115	−0.32	0.859	0.874	−0.341	0.098	0.627	0.447	−0.426	−0.626	−0.46
Cya ^b	0.885	0.680	0.141	0.126	0.408	0.818	0.096	0.266	0.292	0.097	0.251
Dei ^b	−0.567	−0.402	−0.747	−0.491	−0.36	−0.164	0.733^*	0.446	−0.416	−0.57	−0.427
Dei ^b	0.433	0.598	0.253	0.509	0.381	0.699	0.038	0.268	0.305	0.141	0.292

I, the maximum current density; Q, charge output; Rs and Rct represent Ohmic and charge transfer resistance; EC, electrical conductivity; DHA, dehydrogenase; PPO, polyphenol oxidase; TPH, Alkane and PAH indicate degradation rates of total petroleum hydrocarbon, n-alkanes and PAHs; Pro, Bac, Fir, Nor, Aci, Chl, Gem, Pla, Cya, Dei denote Proteobacteria, Bacteroidetes, Firmicutes, Bacteria_norank, Acidobacteria, Chloroflexi, Gemmatimonadetes, Planctomycetes, Cyanobacteria, Deinococcus-Thermus respectively, which were top ten abundances at phylum level.
^an = 4.
^bn = 8.
^*Correlation is significant at the 0.05 level (2-tailed).
^**Correlation is significant at the 0.01 level (2-tailed).

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Table 1 Pearson correlation matrix (2-tailed) between dominant phyla and parameters of soil MFCs.

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