Table 1.
Mean earlywood-vessel density and earlywood-vessel density differences and standard deviations (SD) between 75- and 25-cm stem height measured directly after the flooding treatments.
| Mean vessel density (#/mm, ±SD) | Treatment effect | |||||
|---|---|---|---|---|---|---|
| Phenophase | Treatment | 25 cm stem height | 75 cm stem height | Difference (75–25 cm) | U | P |
| Late bud Dormancy | Stem flooding | 0 ± 0 | 0.25 ± 0.59 | 0.25 ± 0.59 | NT | NT |
| Control | 0.19 ± 0.46 | 0.21 ± 0.62 | 0.01 ± 0.31 | |||
| Budswell | Stem flooding | 1.97 ± 1.67 | 5.09 ± 1.32 | 3.12 ± 1.52 | 26 | ∗∗∗ |
| Control | 3.48 ± 1.71 | 4.60 ± 1.84 | 1.13 ± 1.62 | |||
| Budswell | Root flooding | 3.45 ± 1.78 | 5.07 ± 1.34 | 1.63 ± 1.39 | 102 | – |
| Control | 3.48 ± 1.71 | 4.60 ± 184 | 1.13 ± 1.62 | |||
| Internode expansion | Stem flooding | 3.51 ± 1.06 | 5.83 ± 1.31 | 2.32 ± 1.38 | 55 | ∗ |
| Control | 4.85 ± 0.84 | 5.80 ± 1.17 | 0.95 ± 1.54 | |||
The trees that were flooded for 2, 4, and 6 weeks were pooled per phenophase (n = 15). The effect of flooding on the difference of earlywood-vessel density was tested using Mann–Whitney U tests. U-values and their significance are given as: ∗P < 0.05; ∗∗P < 0.01; ∗∗∗P < 0.001; NT, not tested.