Soil Phosphorus Storage Capacity for Environmental Risk Assessment

Table 3

Selected soil characteristics^† of wetland and ditch soil samples collected to a depth of at least 1 m. Source: [34].

Profile^#	Depth	LOI	WSP	TP	M1-P	M1-Al	M1-Fe	PSR	SPSC
	cm	%	mg/kg^−1						mg/kg^−1
Wetland soil	0–10	6.73	45.1	328	124.8	57	6	1.80	−153
	10–20	4.41	93.1	327	327.2	70	8	3.86	−414
	20–50	1.84	35.5	64	39.3	16	3	1.91	−48
	50–125	1.55	9.3	31	21.0	7	2	2.29	−26
	125–170	3.11	ND	173	16.7	1142	9	0.01	149
Ditch soil	0–10	10.94	59.5	213	73.0	37	2	1.67	−89
	10–20	13.36	59.5	205	219.0	68	3	2.73	−274
	20–50	0.43	8.1	37	26.6	13	2	1.69	−33
	50–65	1.46	12.2	27	16.7	6	2	2.14	−21
	65–105	3.49	153.1	394	331.9	582	2	0.50	−344

LOI: loss on ignition; WSP: water soluble phosphorus; TP: total phosphorus; M-P, M1-Al, M1-Fe: Mehlich 1-phosphorus, aluminum, and iron, respectively.
PSR: calculated from M1-P, Fe, and Al.
SPSC: soil P storage capacity calculated based on a threshold PSR of 0.1.
ND: below the detection limit of the instrument.