Figure captions
Figure 1. Results of two-way ANOVA for the concentrations of labile organic P (POlab), moderately labile organic P (POmod), organic P contained in fulvic acids (Pfulv) and humic acids (Phum) and residual organic P (POres) in mineral soils (0 – 5 cm) of technosols under different tree species. Studied factors include tree species (black locust, black alder, Scots pine, silver birch) and substrate class (Clays, Ashes, Sands). Whiskers indicate standard errors. Bars sharing the same letter do not differ significantly (p < 0.05, Student-Newman-Keuls test).