. 2013 Jan 22;8(1):e53163. doi: 10.1371/journal.pone.0053163

Table 4. Pearson correlation coefficients between morphological characteristics and river major elements of the upper Han River basin, China.

	0°–8°			8°–15°			15°–25°			>25°
	VEG	AGR	Area	VEG	AGR	Area	VEG	AGR	Area	VEG	AGR	Area
*Rainy season*
T	0.688 ^a	−0.170	0.381	0.399	0.245	0.548	−0.383	0.024	−0.270	−0.564	−0.089	−0.492
pH	−0.470	−0.408	−0.677 ^a	−0.347	−0.137	−0.331	0.411	0.286	0.700 ^a	0.427	0.420	0.470
EC	0.534	−0.247	0.331	0.420	0.117	0.561	−0.401	−0.017	−0.276	−0.557	0.069	−0.444
TDS	0.533	−0.247	0.330	0.420	0.116	0.561	−0.400	−0.017	−0.276	−0.557	0.069	−0.444
Cl⁻	0.458	0.188	0.816 ^b	0.495	0.021	0.626	−0.653	−0.377	−0.811 ^b	−0.718 ^a	−0.414	−0.687 ^a
NO₃ ⁻	0.758 ^a	−0.078	0.736 ^a	0.737 ^a	0.012	0.896 ^b	−0.518	−0.372	−0.582	−0.916 ^b	−0.412	−0.846 ^b
SO₄ ²⁻	0.491	0.051	0.730 ^a	0.446	0.047	0.591	−0.641	−0.263	−0.711 ^a	−0.700 ^a	−0.257	−0.636
HCO₃ ⁻	0.207	−0.314	−0.169	0.096	0.156	0.185	−0.072	0.260	0.190	−0.120	0.380	−0.012
Na⁺	0.813 ^b	0.024	0.826 ^b	0.762 ^a	−0.037	0.897 ^b	−0.534	−0.444	−0.656	−0.954 ^b	−0.506	−0.898 ^b
K⁺	0.623	−0.060	0.748 ^a	0.721 ^a	−0.405	0.737 ^a	−0.280	−0.691 ^a	−0.565	−0.794 ^a	−0.678 ^a	−0.794 ^a
Ca²⁺	0.403	−0.307	0.086	0.252	0.050	0.329	−0.232	0.092	−0.063	−0.318	0.251	−0.204
Mg²⁺	0.575	−0.283	0.300	0.527	0.121	0.662	−0.263	−0.082	−0.176	−0.600	−0.060	−0.511
*Dry season*
T	−0.041	0.268	0.394	0.081	−0.083	0.207	−0.501	−0.126	−0.452	−0.326	−0.027	−0.257
pH	0.217	−0.743	−0.296	0.266	−0.291	0.249	0.519	−0.111	0.590	−0.151	−0.033	−0.117
EC	0.699 ^a	0.085	0.538	0.526	0.033	0.593	−0.430	−0.190	−0.458	−0.646	−0.164	−0.574
TDS	0.699 ^a	0.084	0.538	0.526	0.033	0.593	−0.429	−0.190	−0.457	−0.646	−0.164	−0.574
Cl⁻	0.674 ^a	0.255	0.740 ^a	0.614	0.116	0.759 ^a	−0.523	−0.288	−0.593	−0.836 ^b	−0.397	−0.782 ^a
NO₃ ⁻	0.815 ^b	0.235	0.727 ^a	0.679 ^a	0.166	0.800 ^b	−0.459	−0.289	−0.555	−0.840 ^b	−0.462	−0.806 ^b
SO₄ ²⁻	0.684 ^a	0.052	0.747 ^a	0.544	−0.105	0.594	−0.512	−0.373	−0.673 ^a	−0.722 ^a	−0.338	−0.673 ^a
HCO₃ ⁻	0.553	−0.018	0.248	0.398	0.061	0.445	−0.218	−0.045	−0.162	−0.441	−0.002	−0.367
Na⁺	0.857 ^b	0.124	0.801 ^b	0.762 ^a	−0.136	0.820 ^b	−0.417	−0.500	−0.605	−0.896 ^b	−0.560	−0.864 ^b
K⁺	0.717 ^a	−0.045	0.662	0.774 ^a	−0.516	0.703 ^a	−0.027	−0.755 ^a	−0.380	−0.761 ^a	−0.757 ^a	−0.786 ^a
Ca²⁺	0.539	0.175	0.346	0.346	0.079	0.374	−0.327	−0.055	−0.317	−0.417	−0.019	−0.355
Mg²⁺	0.756 ^a	−0.133	0.425	0.648	−0.018	0.701 ^a	−0.202	−0.253	−0.247	−0.675 ^a	−0.253	−0.617

AGR, agriculture; VEG, vegetated lands (forest and shrub).

Bold values represent correlation with significance.

Significance at the 0.05 probability level.

Significance at the 0.01 probability level.