Table 2.

The content of total phosphorus (TP) and available phosphorus (AP), the availability factor (AF), and index of time (TI)

Depth (cm)	Horizon	TP (g kg−1)		AP (mg kg−1)		AF (%)		TI
		Spring	Autumn	Spring	Autumn	Spring	Autumn	TP	AP
Control
0–20	A	0.376	0.239	24.45	39.10	6.50	16.36	0.65	1.60
20–50	ABv	0.331	0.180	14.58	38.11	4.41	21.17	0.54	2.61
50–100	BvC	0.320	0.301	12.24	28.65	3.82	9.52	0.94	2.34
100–130	C	0.324	0.157	9.33	22.54	2.88	12.35	0.48	2.42
Profile I
0–15	A	0.250	0.208	12.74	17.00	5.09	8.17	0.83	1.33
15–72	Bv	0.344	0.202	15.38	18.97	4.47	9.39	0.59	1.23
72–100	C	0.301	0.123	6.01	8.50	2.00	6.91	0.41	1.42
Profile II
0–15	A	0.255	0.231	20.18	26.16	7.91	11.32	0.91	1.30
15–39	ABv	0.437	0.194	23.27	29.75	5.32	15.33	0.44	1.28
39–87	C1	0.286	0.179	18.27	23.89	6.31	13.34	0.63	1.32
87–100	C2	0.261	0.138	12.73	16.21	4.48	11.74	0.53	1.27
Profile III
0–4	A	0.248	0.216	25.13	35.64	10.13	16.50	0.87	1.42
4–18	ABv	0.331	0.240	30.35	34.19	9.20	14.24	0.73	1.12
18–60	Bv	0.306	0.189	11.68	17.92	3.81	9.47	0.62	1.53
60–150	C	0.220	0.191	5.29	7.49	2.40	3.92	0.87	1.42