Statistical analysis
The importance value of each tree, shrub and herb in each plant plot was calculated with the following formulas
Tree IV ¼ ðRDen þ RF þ RDomÞ=300 (1)
Shrub-Grass IV ¼ ðRDen þ RF þ RCÞ=300 (2)
where Tree IV is the tree importance value, RDen is the
relative density, RF is the relative frequency, RDom is the
relative dominance, and RC is the relative coverage.
Species diversity indices were determined (Ma et al.,
1995) as Shannon–Wiener’s index of diversity
H ¼ ΣPi lnPi (3)
Statistical analysisThe importance value of each tree, shrub and herb in each plant plot was calculated with the following formulasTree IV ¼ ðRDen þ RF þ RDomÞ=300 (1)Shrub-Grass IV ¼ ðRDen þ RF þ RCÞ=300 (2)where Tree IV is the tree importance value, RDen is therelative density, RF is the relative frequency, RDom is therelative dominance, and RC is the relative coverage.Species diversity indices were determined (Ma et al.,1995) as Shannon–Wiener’s index of diversityH ¼ ΣPi lnPi (3)
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