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

Figure 3

The ratio of P_av and P_ox in mineral soil at 0–3, 3–10, and 10–30 cm depth under 2 (R2), 3 (R3), 4 (R4), and 14 (R14) years old Robinia pseudoacacia plantations. Error bars represent standard deviations of the mean values; different letters indicate significant difference among the sites (, Holm-Sidak).