Equations / Total volume
Cameroon semi-deciduous forest total wood volume, Eq. (3), power in DBH only
As printed (Équation (3), Résultats / Tableau II, pp. 92-95)
In this library's units, ready to compute (m³)
Total volume = 157.9 * D^2.55 / 1e6D- Diameter at breast height (1.3 m), cm
Total wood volume of the tree (stem and branches) down to a 1 cm diameter cut-off, not biomass. The paper fits V in cm3 with DBH in cm and, per its Methods, H in cm; the unit list has no cm3, so the published form is divided by 1000 and given in dm3, and the canonical form is divided by 1e6 to give m3 (and H in m is multiplied by 100). The paper says biomass follows from multiplying volume by specific density plus a small foliage correction, but gives no equation, so no biomass equation is stored. Sample 55 trees, DBH over 10 cm, more than 17 above 45 cm. R2 is the generalized R2 of Mayer and Butler (1993).
doi:10.19182/bft2011.308.a20477 · Open access · copy we read
55 arbres de 10 à 120 cm de diamètre, appartenant à 23 espèces
La plage de validité de ces équations est de 10 à 120 cm.
R² généralisé 0,93
Vi désigne le volume total de bois jusqu'à un diamètre découpe de 1 cm (en cm3), Dbhi désigne le diamètre à hauteur de poitrine (en cm) et Hi la hauteur (en cm)
- Trees measured
- 55
- DBH range
- 10–120 cm
- R²
- 0.93
- Method
- gls/gnls (nlme in R), variance modelled as a power of DBH; R2 is the generalized R2 (model efficiency)
- Where
- Two forest management units (UFA 10-026 and 10-051), south-east Cameroon, about 1,500 mm rain per year
- Last checked
- 2026-11-02
Shaded: the DBH range the model was fitted on. Other inputs held at the values above.
On every build, the library's form and the paper's own form (in its units) must both give these values within 1%.
| Inputs | Expected | We get | From |
|---|---|---|---|
| D = 20 | 0.328 | 0.328 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 50 | 3.39 | 3.39 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 100 | 19.9 | 19.9 | Computed from the printed form computed from the published form (coefficients as printed) |
Related
- Cameroon semi-deciduous forest total wood volume, Eq. (4), power product in DBH and height · Dorisca et al. 2011 · DBH + Height
- Cameroon semi-deciduous forest total wood volume, Eq. (1), quadratic in DBH plus height · Dorisca et al. 2011 · DBH + Height
- Cameroon semi-deciduous forest total wood volume, Eq. (2), quadratic in DBH only · Dorisca et al. 2011 · DBH
- Cameroon semi-deciduous forest total wood volume, Eq. (4), power product in DBH and height · same paper · Total volume
- Cameroon semi-deciduous forest total wood volume, Eq. (1), quadratic in DBH plus height · same paper · Total volume
- Cameroon semi-deciduous forest total wood volume, Eq. (2), quadratic in DBH only · same paper · Total volume