Soil Phosphorus Forms and Profile Distributions in the Tidal River Network Region in the Yellow River Delta Estuary

Table 3

Mean content (mg kg⁻¹) of P forms of the tidal river network region soil profiles in the Yellow River Delta estuary.

Soil	Depth (cm)	Resin-P	Bicarb-Pi	NaOH-Pi	D.HCl-Pi	C.HCl-Pi	Residual-P	Bicarb-Po	NaOH-Po	C.HCl-Po	Pi	Po	Pt
BRB	0–10	12.5	5.2	4.5	414.1	51.3	41.0	26.6	34.9	30.4	528.6	102.5	620.5
	10–20	11.3	4.3	4.8	418.8	50.0	37.1	26.5	32.6	27.9	526.2	96.2	613.3
	20–30	9.5	4.7	4.0	414.5	42.4	33.4	33.7	33.5	28.2	508.6	100.6	604.0
	30–40	9.1	4.2	3.6	417.7	44.5	35.4	29.6	37.2	33.9	514.5	102.2	615.1
	40–50	7.9	3.1	3.6	440.5	41.8	39.9	31.9	25.7	32.5	536.9	97.5	627.1
	50–60	7.1	3.6	3.8	415.5	40.8	34.3	31.8	28.3	27.6	505.1	94.4	592.9
RB	0–10	14.6	5.8	5.3	423.1	61.1	40.2	50.6	44.9	19.0	550.0	135.7	664.5
	10–20	10.5	5.3	5.4	394.1	65.9	44.5	39.8	46.5	23.8	525.7	130.8	635.8
	20–30	9.8	4.0	5.0	410.2	51.6	44.5	33.7	38.9	20.3	525.1	117.1	618.0
	30–40	10.1	4.4	5.2	418.2	60.4	44.9	42.1	44.4	19.7	543.1	131.4	649.3
	40–50	10.5	4.8	5.9	417.1	70.6	40.1	41.8	44.3	28.2	549.0	126.1	663.3
	50–60	10.7	5.4	5.7	441.6	60.2	38.2	37.0	44.4	21.0	561.8	119.5	664.1
TB	0–10	18.4	8.2	7.5	421.9	78.7	46.4	20.7	26.6	26.4	581.1	93.7	654.8
	10–20	15.6	6.5	5.9	420.6	71.8	46.7	16.8	27.2	21.6	567.1	90.7	632.7
	20–30	12.8	4.5	5.1	420.5	67.2	46.3	14.1	22.7	19.1	556.4	83.1	612.4
	30–40	14.2	5.1	5.2	424.8	70.7	50.4	18.7	25.9	20.1	570.4	95.0	635.1
	40–50	14.5	5.4	5.3	420.8	83.5	50.8	20.5	25.8	28.3	580.3	97.0	654.9
	50–60	12.1	5.0	5.2	432.4	70.6	40.6	15.2	26.0	20.7	565.8	81.8	627.8
TCB	0–10	18.8	9.7	7.7	419.6	82.4	44.3	40.1	24.3	29.7	582.5	108.6	676.5
	10–20	18.7	7.7	6.6	414.2	71.3	49.3	40.6	15.9	30.1	567.9	105.8	654.5
	20–30	15.4	6.5	5.4	416.7	75.9	50.9	36.5	24.0	22.5	570.8	111.4	653.8
	30–40	15.8	6.5	5.4	407.7	71.1	45.6	36.8	18.7	33.4	552.0	101.2	640.9
	40–50	16.0	6.4	5.6	407.6	83.2	47.0	37.5	23.9	29.7	565.8	108.4	656.9
	50–60	15.0	5.6	6.2	421.9	84.2	45.3	33.8	25.8	26.1	578.3	104.9	664.0