Fig. 1
From: Linking forest diversity and tree health: preliminary insights from a large-scale survey in Italy
a: Distribution of conifer, broadleaves and mixed forests of the Italian ICP Forests network (Level I). b: Distribution of the severity of defoliation per plot. Each point expresses the percentage of trees with defoliation > 60% at a given plot. c: Tree diversity (Shannon Index) for each plot, dimensionless. d: Distribution of the plots aggregated according to the results of the cluster analysis, taking in account physical, ecological and vegetational characteristics. The number in legend indicates the cluster (see Fig. 3)