Table 2.

Random forest analysis of the genetic abundances of hhyL and rbcL1E, relative to 16S rRNA genes, and 16S rRNA genes against 26 physicochemical parameters.

	hyyL/16S rRNA		rbcL1E/16S rRNA		16S rRNA
	%IncMSE	%IncMSE.pval	%IncMSE	%IncMSE.pval	%IncMSE	%IncMSE.pval
Moisture	24.38	0.002	69.35	0.001	26.19	0.003
Mud	15.61	0.034	28.73	0.003	40.45	0.001
TC	17.48	0.019	16.45	0.023	27.47	0.004
pH	11.64	0.077	14.7	0.052	31.35	0.002
Elevation	13.12	0.046	9.49	0.105	31.81	0.001
NO3	6	0.266	32.83	0.002	15.28	0.033
Na2O	−2.71	0.981	24.4	0.004	17.63	0.026
MgO	10.71	0.135	19.47	0.013	21.33	0.008
CaO	10.87	0.130	26.44	0.005	11.92	0.139
TN	7.48	0.323	11.84	0.075	26.91	0.003
Aspect	3.96	0.421	18.61	0.025	19.25	0.028
K2O	5.6	0.459	8.55	0.145	27.04	0.001
MnO	6.39	0.392	16.09	0.037	17.99	0.033
Al2O3	7.65	0.218	11.33	0.070	20.59	0.013
Cl	15.37	0.031	14.5	0.045	8.84	0.199
Conductivity	8.61	0.218	5.74	0.282	23.86	0.006
Sand	2.67	0.686	22.82	0.009	9.06	0.261
Fe2O3	4.04	0.690	12.49	0.080	12.94	0.121
SiO2	4.82	0.601	6.94	0.251	16.87	0.037
TiO2	6.35	0.375	8.32	0.170	13.63	0.078
PO4	5.06	0.327	5.88	0.215	17.23	0.025
NO2	4.44	0.182	8.29	0.087	12.83	0.040
SO4	7.78	0.202	7.18	0.202	10.09	0.175
P2O5	5.58	0.472	7.56	0.221	10.59	0.186
Br	3.62	0.411	3.71	0.337	15.53	0.017
TP	2.49	0.724	4.11	0.398	12.79	0.089

Bold text = significant p values (<0.05).