2.5 Statistical analysis
All data used in this study met the Shapiro–Wilk test of normality and
the Levene’s test of homogeneity of variance.
Two-way ANOVA of general linear models were used to assess the effects
of fencing duration, shrub cover and their interaction on species
richness, phylogenetic diversity and phylogenetic structure. A one-way
ANOVA analysis with Tukey’s HSD test was conducted to evaluate the
difference among levels of fencing duration or shrub cover when
interaction were not significant. Alternatively, a simple-effect
analysis was used to evaluate the difference of levels of one factor
under a certain condition of another factor when significant interaction
were found. Linear model was applied to test the relationship between
phylogenetic diversity and species richness.