. 2013 Jun 26;185(12):9871–9888. doi: 10.1007/s10661-013-3298-9

Table 2.

Principal component matrix with eigenvalues, variability, and cumulative spatial variations of variables and factors

Variables	Group A			Group B			Group C
Variables	PC1	PC2	PC3	PC1	PC2	PC3	PC1	PC2
As	0.228	−0.346	−0.415 ^b	0.403	0.659 ^a	0.062	−0.814 ^a	−0.157
Cd	−0.273	0.155	0.885 ^a	−0.349	−0.112	0.767 ^a	−0.927 ^a	0.150
Co	0.956 ^a	−0.0001	0.056	0.958 ^a	0.162	0.005	−0.399 ^b	−0.043
Cr	0.863 ^a	0.199	−0.034	0.813 ^a	−0.046	−0.002	1.066 ^a	−1.345
Cu	0.355	0.186	0.849 ^a	0.283	−0.137	0.870 ^a	0.056	−0.577 ^b
Ni	0.806 ^a	0.287	0.096	0.838 ^a	−0.119	0.100	−0.374	1.536 ^a
Pb	0.766 ^a	−0.073	−0.133	0.478 ^b	0.180	−0.262	0.393	−1.362 ^a
V	0.918 ^a	−0.189	−0.048	0.760 ^a	0.468	0.040	1.125 ^a	2.989
Zn	0.864 ^a	−0.057	−0.035	0.793 ^a	0.285	0.065	2.930 ^a	−0.158
Fe	0.941 ^a	−0.094	0.108	0.877 ^a	0.053	−0.009	−0.718 ^a	−0.204
pH	−0.036	0.062	−0.266 ^b	0.251	0.056	0.731 ^a	−0.723 ^a	0.049
EC	−0.086	0.210 ^b	0.098	−0.180 ^b	−0.130	0.154	−0.916 ^a	0.172
OM	−0.268	0.465 ^b	0.019	−0.371	−0.213	0.415 ^b	−0.948 ^a	0.177
Sand	−0.207	−0.954 ^a	−0.008	−0.132	0.937 ^a	−0.178	0.032	−0.279 ^b
Silt	0.099	0.739 ^a	−0.171	−0.229	−0.879 ^a	0.241	0.450 ^b	−0.477
Clay	0.212	0.653 ^a	0.211	0.538 ^b	−0.493	−0.004	−0.233 ^b	−0.471
Eigenvalue	5.81	2.76	1.59	5.74	2.99	1.76	1.79	0.20
Variability	36.24	15.62	11.74	34.01	17.51	14.08	89.95	6.85
Cumulative	36.24	51.87	63.61	34.01	51.52	65.60	89.95	96.80

Italicized values with the same letter are not significantly different at p<0.01^a or p<0.05^b