Table 1 Descriptive statistics (mean and standard deviations, range of diameter and age) of the sampled trees (n = 430)
|  | Quercus robur | Betula pubescens | Eucalyptus globulus | Eucalyptus nitens | Populus euramericana and P. × interamericana × P. nigra | Populus × interamericana and P. trichocarpa |
|---|---|---|---|---|---|---|
Management | Semi-natural forest | Semi-natural forest | Forest plantation | Forest plantation | SRF | SRF |
Plots | 6 | 9 | 25 | 12 | 4 | 4 |
Tree number | 19 | 34 | 61 | 12 | 150 | 154 |
Diameter (cm) | 18.1 (6.1) 5.8–37.7 | 13.9 (5.9) 7.7–27.1 | 15.3 (8.0) 5.8–37.7 | 20.8 (5.9) 13.3–34.1 | 4.4 (1.5) 1.9–9.1 | 5.0 (1.5) 2.0–8.6 |
Age (years) | 74 (20.2) 53–108 | 33 (11.0) 22–64 | 8.6 (3.0) 1–17 | 10.8 (1.4) 9–13 | 5.6 (1.5) 4–7 | 5.3 (1.5) 4–7 |
Clones/genotypes | 1 | 1 | 3 | 1 | 4 | 4 |