Statistical analysis
Two-way analysis of variance (ANOVA) followed by Student-Newman-Keuls test (p < 0.05) was used to test for the effect of tree species, and substrate type on the concentrations of organic P forms in the studied technosols. Prior to ANOVA the dependent variables were tested for distribution normality (Shapiro-Wilk test, p < 0.05) and homoscedasticity (Levene’s test, p < 0.05) and transformed (logarithmic, square root or power transformation) if necessary.
All analyses were performed with Statgraphics Centurion XVII software (Statistical Graphics Corporation).