Table 6. The chemical properties by soil horizon and parent rocks.

Soil horizon	Parent rocks	pH (1:5)	SOM (%)	TN (%)	CEC	K+	Na+	Ca2+	Mg2+
					(cmolc/kg)
A	Igneous	4.74 ± 0.61	5.85 ± 4.32	0.25 ± 0.22	18.2 ± 11.0	0.19 ± 0.14	0.10 ± 0.09	1.75 ± 2.91	0.68 ± 1.04
	Metamorphic	4.65 ± 0.50	4.68 ± 2.53	0.19 ± 0.11	17.8 ± 9.1	0.18 ± 0.13	0.08 ± 0.08	1.35 ± 2.20	0.50 ± 0.88
	Sedimentary	4.95 ± 0.75	4.89 ± 3.95	0.25 ± 0.18	16.6 ± 8.4	0.21 ± 0.14	0.08 ± 0.06	2.65 ± 4.24	0.92 ± 1.00
	Mean	4.74 ± 0.60	5.21 ± 3.66	0.23 ± 0.18	17.6 ± 9.7	0.19 ± 0.14	0.09 ± 0.08	1.86 ± 3.18	0.69 ± 0.99
B	Igneous	4.96 ± 0.54	3.34 ± 4.07	0.14 ± 0.21	15.4 ± 9.5	0.13 ± 0.08	0.11 ± 0.12	1.14 ± 2.00	0.55 ± 0.83
	Metamorphic	4.88 ± 0.47	2.10 ± 1.76	0.08 ± 0.11	15.0 ± 6.8	0.14 ± 0.09	0.09 ± 0.08	0.98 ± 1.81	0.44 ± 0.88
	Sedimentary	5.16 ± 0.70	2.57 ± 3.06	0.13 ± 0.17	13.1 ± 7.0	0.15 ± 0.09	0.10 ± 0.06	1.67 ± 3.21	0.73 ± 0.83
	Mean	4.96 ± 0.55	2.71 ± 3.20	0.12 ± 0.17	14.5 ± 8.0	0.14 ± 0.09	0.10 ± 0.09	1.26 ± 2.42	0.57 ± 0.86