| Variables | Statistics | BACK |
| Group | Variable | Units | Description |
|---|---|---|---|
| Biomass | Mass_leaf | kg | Leaf biomass |
| Mass_stem | kg | Stem biomass. Sum of stem and branch biomass because some studies did not discriminate these organs. | |
| Mass_top | kg | Aboveground biomass | |
| Mass_root | kg | Root biomass (total of all root classes) | |
| Mass_tot | kg | Total biomass; sum of Mass_leaf, Mass_stem and Mass_root or sum of Mass_top and Mass_root. | |
| Mass_branch | kg | Branch biomass | |
| Mass_thickroot | kg | Thick root biomass (>20mm) | |
| Mass_thinroot | kg | Thin root biomass (<20mm, >2mm) | |
| Mass_froot | kg | Fine root biomass (<2mm) |