Table 2 Timing of main events and characteristics of tree ring formation in stems of Cedrus libani
From: Cambial activity and xylogenesis in stems of Cedrus libani A. Rich at different altitudes
Site | O1 | T4 | T3 | T2 | T1 |
|---|---|---|---|---|---|
Observation | (335 m) | (1055 m) | (1355 m) | (1665 m) | (1960 m) |
Number of cells in dormant cambial zone | 7.7 ± 1.0 | 5.5 ± 0.5 | 4.9 ± 0.6 | 5.0 ± 0.5 | 5.0 ± 0.6 |
Onset of cambial activity | Apr 19 (110) | Apr 3 (94) | May 3 (124) | May 3 (124) | May 3 (124) |
Onset of growth | Apr 30 (121) | Apr 10 (101) | May 3 (124) | May 3 (124) | May 15 (136) |
Start of cell wall thickening | May 19 (140) | May 7 (128) | June 7 (155) | June 7 (155) | June 7 (155) |
Dormant cambium | Sep 6 (250) | Aug 26 (239) | July 29 (211) | Aug 12 (225) | Aug 12 (225) |
End of growth | Oct 10 (284) | Oct 1 (275) | Sep 24 (268) | Sep 26 (270) | Sep 26 (270) |
Duration of cambial activity (days) | 140 | 145 | 87 | 101 | 101 |
Duration of xylogenesis (days) | 163 | 174 | 144 | 146 | 134 |
Total number of xylem cells | 120.1 ± 8.5 | 96.6 ± 34.0 | 18.0 ± 6.4 | 31.6 ± 8.3 | 45.3 ± 13.4 |
Cell production rate (cells/day) | 0.73 ± 0.05 | 0.55 ± 0.19 | 0.12 ± 0.04 | 0.21 ± 0.05 | 0.33 ± 0.1 |
Ring width (mm) | 3.35 ± 0.65 | 2.76 ± 0.99 | 0.55 ± 0.19 | 1.01 ± 0.38 | 1.36 ± 0.39 |