2.4 Statistical analysis
Firstly, we inspected bivariate relationships between forest
productivity/AGB stability and the individual predictor factors (Fig.
S1). We used t -tests to analyze whether the mean temporal
stability of AGB or productivity differed between planted forests and
natural forests. Secondly, a linear mixed effect model (LME) was used to
analyze the trend in AGB stability and productivity over time in planted
forest and natural forest, “year” as a fixed effect and “plot” as a
random effect. We also analyzed whether there were differences in
stability and productivity in the two forest types over time. The mean
stability and productivity were z-transformed prior to all analyses.