Sequestration of P fractions in the soils of an incipient ferralisation chronosequence on a humid tropical volcanic island

Chiu, Chih-Yu; Baillie, Ian; Jien, Shih-Hao; Hallett, Liam; Hallett, Stephen

doi:10.1186/s40529-021-00326-5

Botanical Studies

Table 2 Fe and Al extracts from soils of Green Island chronosequence

From: Sequestration of P fractions in the soils of an incipient ferralisation chronosequence on a humid tropical volcanic island

Bench height (m)	Horizon	pH	Organic C (%)	Fe_t Total Fe (g kg⁻¹)	Fe_d Free Fe (g kg⁻¹)	Fe_d/Fe_t Fe freed (%)	Fe_o Non-crystalline free Fe (g kg⁻¹)	Fe_d - Fe_o Crystalline free Fe (g kg⁻¹)	(Fe_d –Fe_o)/Fe_d Crystallinity of free Fe (%)	Al_t Total Al (g kg⁻¹)	Al_d Free Al (g kg⁻¹)	Al_d/Al_t Al freed (%)	Al_o Non- crystalline free Al (g kg⁻¹)	Al_d - Al_o Crystalline free Al (g kg⁻¹)	(Al_d –Al_o)/Al_d Crystallinity of free Al (%)
15	A	8.05	6.88	15.8	3.69	23	1.43	2.26	61	25.3	1.81	7	2.89	− 1.08	–
	C1	8.39	3.96	12.3	3.24	26	1.19	2.05	63	20.3	1.85	9	2.64	− 0.79	–
	C2	7.77	4.14	11.3	2.77	25	1.06	1.71	62	19.9	1.74	9	2.31	− 0.57	–
	C3	8.54	2.21	6.48	1.15	18	0.67	0.48	42	12.4	1.18	9	1.12	0.06	5
20	A	7.29	5.60	29.0	6.90	34	3.49	3.41	49	90	10.3	11	16.5	− 6.2	–
	Bw	6.79	0.79	23.0	5.80	25	3.15	2.65	46	71	6.72	9	2.49	4.23	63
	BC	6.84	0.19	nd	5.82	–	5.42	0.40	7	nd	2.69	–	2.99	− 0.30	–
	C	7.10	0.11	30.0	3.68	12	5.06	− 1.38	–	71	1.66	2	1.91	− 0.25	–
50	A	5.16	2.36	74.9	42.2	56	6.05	36.2	86	80.3	10.6	13	5.06	5.5	52
	Bt	5.00	1.61	73.8	46.8	63	6.97	39.8	87	88.2	10.8	13	6.00	4.8	44
	2 A	5.28	2.56	69.7	47.1	68	13.6	33.5	71	68.7	11.8	17	6.89	5.0	42
	2Bt	5.07	1.57	81.0	58.3	72	5.98	52.3	90	81.7	14.2	17	6.50	7.7	54
	2 C	4.61	0.23	67.0	36.0	46	8.27	27.7	77	108	9.53	9	8.43	1.1	11
90	A	5.04	3.28	64.5	22.0	34	4.72	17.7	80	53.4	4.39	8	4.11	0.28	6
	AB	5.28	2.50	63.5	49.5	78	5.72	43.8	88	63.4	10.3	16	4.96	5.3	51
	Bt1	5.18	1.73	77.8	51.0	66	4.68	46.3	91	84.0	9.79	12	4.68	5.11	52
	Bt2	5.28	1.30	69.6	46.4	67	5.18	41.2	89	63.8	8.83	14	4.58	4.25	48
	BC	5.16	0.30	78.4	33.9	43	4.92	29.0	86	84.5	6.90	8	4.87	2.03	33
100	A	6.44	2.73	59.3	35.2	59	4.34	30.9	88	84.3	7.65	9	3.31	4.32	56
	AB	7.42	2.01	53.7	38.1	71	4.75	33.3	87	74.0	7.91	11	3.36	4.55	57
	Bt1	7.44	0.77	62.0	46.2	75	2.68	43.5	94	81.7	9.23	11	3.33	5.90	64
	Bt2	7.15	0.88	59.6	48.2	81	2.54	45.7	95	64.2	10.9	17	4.38	6.52	60
	BC	6.90	0.31	44.8	23.7	53	1.38	22.3	94	71.5	6.47	9	3.54	2.93	45
170	O/A	4.02	2.84	68.1	41.7	61	2.62	39.1	94	nd	12.9	–	3.60	9.30	72
	Bt1	4.52	0.82	76.5	48.7	64	1.62	47.1	97	89.8	10.5	12	3.28	7.22	69
	Bt2	4.69	0.76	75.5	46.7	62	1.40	45.3	97	93.0	11.4	12	3.50	7.90	69
	Bt3	4.81	0.60	75.8	44.8	59	1.35	43.4	97	90.5	12.1	13	3.56	8.54	58
	Bt4	4.62	0.54	73.5	43.1	59	1.62	41.6	97	97.8	10.7	11	3.85	6.85	64
	C	4.62	0.25	58.6	23.1	39	1.85	21.3	92	101	5.66	6	3.42	2.24	40
190	A	6.01	7.80	nd	44.1	–	9.72	34.4	78	51.3	15.2	30	9.14	6.06	40
	2Bt1	4.75	1.32	68.6	61.3	89	9.51	51.8	85	78.0	13.1	17	4.97	8.13	62
	2Bt2	4.65	1.05	71.5	69.8	97	5.61	64.2	92	77.7	14.0	18	4.22	9.78	70
	2Bt3	4.56	0.80	78.3	60.3	77	5.19	55.1	91	96.3	18.7	19	4.37	14.3	76
240	A	4.78	7.40	93.9	82.2	88	6.53	75.7	92	60.8	20.2	33	4.40	15.8	78
	Bt1	4.62	1.25	94.8	54.9	58	4.93	50.0	91	97.2	11.5	12	4.79	6.71	58
	Bt2	4.71	0.86	77.2	57.4	74	3.20	54.2	95	71.6	12.1	17	4.65	7.45	62
	BC	4.62	0.53	98.9	55.9	57	2.71	53.2	95	89.5	11.3	13	4.44	6.86	61

t, XRF; d, dithionite-citrate-bicarbonate extract; o, oxalate extract, nd, no data

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