Fig. 2: The relative importance of climate and trait variables explaining bark decomposition at global scale.

a The relative importance of variables explaining variation in bark decay constant (k, year⁻¹) globally using a Random Forest model. Dark and light green bars indicate climate-related factors and bark substrate quality, respectively. b Relationships between observed and predicted bark k values based on the Random Forest model. The red dashed line is the 1:1 line. c Spearman correlation coefficients between bark k values and variables representing climate and bark traits. The circle size is proportional to the coefficients. Positive correlations are displayed in red and negative correlations in purple.