To determine how tree size affects the association between
AGC and tree species richness and evenness, we grouped
trees in each plot into DBH-classes (5–20 cm, 20.1–40 cm,
40.1–60 cm, 60.1–80 cm, 80.1–100 cm and 100.1–110 cm).
We determined AGC, tree species richness and evenness in
each DBH-class for each plot. Using a regression model, we
fitted a random intercept mixed model with AGC as response
variable and tree species richness, evenness and their first
order quadratic terms as predictors with DBH-class as a random
factor (Zuur et al. 2009). The analyses were done with
the R-Software 3.0.1
To determine how tree size affects the association betweenAGC and tree species richness and evenness, we groupedtrees in each plot into DBH-classes (5–20 cm, 20.1–40 cm,40.1–60 cm, 60.1–80 cm, 80.1–100 cm and 100.1–110 cm).We determined AGC, tree species richness and evenness ineach DBH-class for each plot. Using a regression model, wefitted a random intercept mixed model with AGC as responsevariable and tree species richness, evenness and their firstorder quadratic terms as predictors with DBH-class as a randomfactor (Zuur et al. 2009). The analyses were done withthe R-Software 3.0.1
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