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).