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Table IV
Multiple linear stepwise regressions to explain growth increments (HI and DBHI) from phenology traits (Cf, LF, GSD) and carbon isotope composition (δ13C, obtained from family mean values) in two consecutive years (2006 and 2007).
| Trait | Initial variable | Initial | Initial | Final | Final | Final |
|---|---|---|---|---|---|---|
| R2 | MSE | stepwise model | R2 | MSE | ||
| HI (2006) | phenology (Cf, LF, GSD) | |||||
| LF | 0.12 | 0.0167 | H = − 1.71 + 0.007LF | 0.12 | 0.0167 | |
| δ13C + phenology (Cf, LF, GSD) | ||||||
| δ13C | 0.35*** | 0.0123 | H = − 4.18− 0.17δ13C | 0.35*** | 0.0123 | |
| DBHI (2006) | phenology (Cf, LF, GSD) | |||||
| GSD | 0.30** | 0.15 × 10−3 | DBH = − 0.143 + 0.001GSD | 0.30** | 0.15 × 10−3 | |
| δ13C + phenology (Cf, LF, GSD) | ||||||
| δ13C | 0.35*** | 0.14 × 10−3 | DBH = − 0.423− 0.013δ13C + 0.006 GSD | 0.45*** | 0.13 × 10−3 | |
| HI (2007) | phenology (Cf, LF, GSD) | |||||
| GSD | 0.11 | 0.0068 | H = − 0.42 + 0.004GSD | 0.11 | 0.0068 | |
| δ13C + phenology (Cf, LF, GSD) | ||||||
| δ13C | 0.15 | 0.0065 | H = − 2.40− 0.16δ13C – 0.01 Cf | 0.50*** | 0.0040 | |
| DBHI (2007) | phenology (Cf, LF, GSD) | |||||
| GSD | 0.36*** | 0.21 × 10−3 | DBH = − 0.237 + 0.0015GSD | 0.36*** | 0.21 × 10−3 | |
| δ13C + phenology (Cf, LF, GSD) | ||||||
| δ13C | 0.36*** | 0.21 × 10−3 | DBH = − 0.836 + 0.002GSD – 0.018 δ13C | 0.54*** | 0.15 × 10−3 | |