Phosphorus Sorption Kinetics in Reclaimed Lignite Mine Soils under Different Age Stands of Robinia pseudoacacia L. in Northeast Germany

Table 5

Oxalate extractable Fe, Al and P, P sorption maximum (PS_max), α values measured from P sorption (α_sorp), and initial values (α_initial) at 0–3, 3–10, and 10–30 cm soil layers under 2 (R2), 3 (R3), 4 (R4), and 14 (R14) years old Robinia pseudoacacia plantations. Different letters within columns indicate significant difference among the sites (, Holm-Sidak).

Study site	Feox	Alox	PSmax	Pox	αsorp	αinitial
	mmol kg^−1
	0–3 cm
R2	13.10bc	5.65b	1.37c	1.12b	0.13	0.06
R3	9.81c	4.88b	1.19c	1.13b	0.16	0.08
R4	17.92b	6.91b	1.85b	2.00b	0.15	0.08
R14	33.35a	12.32a	2.57a	3.88a	0.14	0.09
3–10 cm
R2	12.07b	5.10b	1.19c	1.01b	0.13	0.06
R3	9.85b	4.87b	1.28c	0.99b	0.15	0.07
R4	13.64b	6.31b	1.49b	1.25b	0.14	0.06
R14	35.53a	12.68a	2.76a	3.05a	0.12	0.06
10–30 cm
R2	10.34b	4.28c	1.14c	0.71b	0.13	0.05
R3	9.03b	3.88c	1.10c	0.76b	0.14	0.06
R4	11.90b	5.88b	1.80b	0.94b	0.15	0.05
R14	37.14a	13.63a	2.87a	3.07a	0.12	0.06