Table 2 Descriptive statistics of raw crossdated ring width series for the study species in each site; t-value BP: t-value Baillie Pilcher, GLK: Gleichläufigkeitskoeffizient
Variables | Mean statistical attributes (or ranges) | ||||
|---|---|---|---|---|---|
Hugumburda | Desa’a | ||||
J. procera | O. europaea | P. falcatus | J. procera | O. europaea | |
No. of trees sampled | 38 | 10 | 20 | 36 | 14 |
No. of dated series | 33 | 10 | 18 | 32 | 13 |
Average diameter (cm) (range) | 20 (12–42) | 13 (10–19) | 21 (11–39) | 23 (14–50) | 22 (16–35) |
Average age (years) (range) | 43 (23–65) | 36 (28–46) | 35 (20–54) | 54 (32–112) | 76 (48–129) |
Time span (years) | 1949–2016 | 1969–2015 | 1963–2016 | 1905–2016 | 1888–2016 |
Average ring width (mm) (SD) | 2.31 (0.54) | 2.01 (0.36) | 2.50 (0.58) | 1.83 (0.57) | 1.61 (0.20) |
Average correlation with master | 0.51 | 0.54 | 0.54 | 0.57 | 0.55 |
1st order autocorrelation (unfiltered) | 0.04 | 0.11 | 0.11 | 0.20 | 0.14 |
Average mean sensitivity | 0.63 | 0.52 | 0.52 | 0.55 | 0.43 |
Standard deviation (filtered) | 0.64 | 0.66 | 0.66 | 0.64 | 0.59 |
Flagged segments (%) | 4.11 | 10 | 5.71 | 1.74 | 0.0 |
t-value BP (SD) | 5.64 (1.33) | 7.62 (1.27) | 6.87 (2.0) | 7.7 (3.0) | 10.8 (3.61) |
GLK (SD, %) | 95.5 (3.26) | 98.3 (1.95) | 94 (5.46) | 93.7 (3.42) | 94.1 (3.23) |