Fig. 2

Theoretical framework of the model. Fine root length data were arranged in tabular form with samples (objects) in rows and variables in columns (a). Fine root length for each diameter interval was expressed as a percentage of the total fine root length found for each average sample (b). Autoscaling was performed according to the different sites (c). PCA employment resulted in graphed score and loading plots used as input for the CA calculation with the generation of a dendrogram (d). New diameter sub-classes are obtained by summing values of the diameter units falling within each diameter sub-class (e). Fine root length and mass may be calculated according to the new sub-classes (f)