Table 3.
Pearson correlation matrix of the measured wood traits, and simultaneously measured and calculated environmental variables at a weekly scale
| Variables | δ13C | δ18O | VL | PRM | p | R | RH | T | VPD |
|---|---|---|---|---|---|---|---|---|---|
| δ13C | –0.26 | 0.46 | 0.60 | 0.23 | 0.72 | –0.55 | 0.59 | 0.56 | |
| δ18O | –0.24 | –0.20 | –0.08 | –0.06 | 0.15 | –0.04 | –0.07 | ||
| VL | 0.60 | 0.23 | 0.27 | –0.11 | 0.15 | 0.18 | |||
| PRM | 0.05 | 0.55 | –0.41 | 0.49 | 0.44 | ||||
| p | 0.08 | 0.15 | 0.10 | –0.06 | |||||
| R | –0.79 | 0.72 | 0.88 | ||||||
| RH | –0.65 | –0.90 | |||||||
| T | 0.68 |
δ13C and δ18O, high-resolution isotopes from wood cellulose (‰); VL, vessel lumen fraction (–); PRM, parenchyma fraction (–); p, precipitation (mm); R, solar radiation (W m−2), RH, relative humidity (%); T, temperature (°C), VPD, vapour pressure deficit (kPa). Bold type indicates significant correlations (P < 0.01).