Table 3 Non-destructive testing acoustic velocity on standing trees (TreeSonic) and green logs (MTG)
Species | Thinning | Velocity TreeSonic | Velocity MTG | Velocity difference (%) | ||
|---|---|---|---|---|---|---|
Mean (m s−1) | COV (%) | Mean (m s−1) | COV (%) | |||
Alder | 1st | 3609 | 4.6 | 3053 | 7.1 | 18.2 |
2nd | 4254 | 5.3 | 3419 | 3.1 | 24.4 | |
Both | 3931 | 9.6 | 3257 | 7.5 | 20.7 | |
Ash | 1st | 4738 | 4.5 | 4088 | 5.5 | 15.9 |
2nd | 4928 | 5.2 | 4185 | 2.7 | 17.8 | |
Both | 4833 | 5.3 | 4136 | 4.5 | 16.9 | |
Birch | 1st | 4734 | 2.7 | 3877 | 5.8 | 22.1 |
2nd | 4635 | 4.9 | 3704 | 8.4 | 25.1 | |
Both | 4684 | 4.1 | 3791 | 7.5 | 23.6 | |
Sycamore | 1st | 3537 | 9.4 | 3139 | 5.0 | 12.7 |
2nd | 4661 | 7.3 | 4034 | 5.5 | 15.5 | |
Both | 3959 | 16.1 | 3475 | 13.5 | 13.9 | |
All together | 4372 | 12.9 | 3686 | 12.3 | 18.6 | |