Silicon and Aluminum Mobility in Soils of Jeju Island, Korea

Table 2

Physical and chemical properties of the soils studied in Jeju Island.

Horizon	Depth	Munsell color	Bd	pH	OC	BS	Sio	Alp	Alo.	Ferr.	Alp/Alo	MI
	(cm)	(Moist)	(Mg·m^−3)	(CaCl2)	(g·kg^−1)	(%)	(%)	(%)	(%)	(%)
Pyeongdae
A	0–18	10 YR 2/1	0.51	4.87	120	2.74	0.77	1.88	7.27	4.10	0.44	1.49
AB	18–44	10 YR 2/2	0.52	5.05	87.3	4.48	1.69	0.91	15.9	7.50	0.17	1.49
Bw1	44–73	10 YR 3/4	0.60	5.24	43.7	4.89	1.75	0.41	13.3	8.12	0.11	1.47
Bw2	73–100	10 YR 4/4	0.71	5.36	23.0	5.68	2.13	0.21	15.2	12.07	0.05	1.38
BC	100–140	7.5 YR 4/4	0.72	5.59	15.4	5.98	3.03	0.17	19.5	12.48	0.04	1.26
Namwon
A1	0–26	10 YR 2/1	0.57	4.36	118	3.74	0.42	2.10	3.95	5.15	0.59	1.52
A2	26–47	10 YR 2/2	0.57	4.61	104	2.90	0.47	2.38	4.43	5.68	0.60	1.51
AB	47–72	10 YR 3/2	0.59	4.69	91.5	3.48	0.69	2.28	6.52	6.30	0.52	1.52
Bw	72–160	10 YR 4/4	0.74	4.94	30.6	7.95	1.06	0.50	9.95	9.07	0.16	1.43
Jeju
Ap	0–20	10 YR 3/2	0.92	4.41	37.8	2.08	0.17	0.90	—	3.24	0.59	—
AB	20–41	10 YR 3/3	1.03	4.36	19.9	1.73	0.19	0.69	—	2.94	0.55	—
Bt1	41–65	10 YR 4/3	1.29	4.29	9.80	3.81	0.14	0.47	—	2.37	0.63	—
Bt2	65–92	7.5 YR 4/4	1.48	4.19	7.12	6.32	0.13	0.36	—	2.08	0.56	—
Bt3	92–150	7.5 YR 4/4	1.48	4.12	6.40	10.1	0.16	0.28	—	2.06	0.46	—
Gangjeong
Ap	0–24	10 YR 3/3	1.05	4.79	30.2	53.3	0.20	0.36	—	2.34	0.52	—
Bat	24–38	10 YR 4/3	1.36	4.52	13.9	43.5	0.09	0.24	—	1.06	0.57	—
Bt1	38–53	10 YR 4/4	1.48	4.53	5.15	45.0	0.09	0.13	—	0.94	0.41	—
Bt2	53–85	10 YR 4/4	1.53	4.47	2.86	50.5	0.11	0.09	—	1.31	0.31	—
Bt3	85–135	10 YR 4/6	1.53	4.42	1.92	57.0	0.13	0.08	—	2.00	0.27	—

Bd: bulk density, OC: organic carbon, BS: base saturation, Sio: acid oxalate extractable Si, Alp: sodium pyrophosphate extractable Al, Alo: allophane, Ferr: ferrihydrite, MI: melanic index.