Equations / Aboveground biomass, without leaves
Pruned Faidherbia albida total wood mass from D²H (Eq. 3.5)
© Bernard DUPONT · CC BY-SA · iNaturalistAs printed (Table II, p. 10)
In this library's units, ready to compute (kg)
Aboveground biomass, without leaves = 1.06 * exp(-2.050 + 0.872 * ln(D^2 * H))D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Response is TDWb, total above-ground wood dry mass (pruned wood plus post-pruning wood of trunk and branch stumps); foliage was not weighed, so it is excluded. Pruned-wood mass uses a 0.439 dry-matter fraction and post-pruning mass uses volume x 0.411 g cm-3 mean basic density, so it is a semi-destructive estimate. The back-transform applies the printed CF (1.06, given to two decimals). Natural log assumed from the paper's ln notation. DBH range not stored: Table I gives 31.8 to 110.4 cm but the text gives 28 to 183 cm for the 18 trees. Crown-area (Ca) equations from the same table are not added because Ca is not a canonical variable (computed as an ellipse area from two crown diameters).
doi:10.19182/bft2026.363.a37930 · Open access · copy we read
Bias correction coefficient to transform predictions back to the original scale while accounting for the variance of the residuals.
the sample of 18 Faidherbia albida trees
- Trees measured
- 18
- Height range
- 9–14 m
- Correction factor
- 1.06 (applied)
- Method
- log-log regression (OLS)
- Where
- Gané and Sirlawé villages, Mayo-Danay, Far North region, Cameroon
- 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 = 50, H = 10 | 933.3 | 933.3 | Computed from the printed form computed from the Table II coefficients with the printed CF 1.06 |
| D = 90, H = 13 | 3,270 | 3,270 | Computed from the printed form computed from the Table II coefficients with the printed CF 1.06 |
Related
- Pruned Faidherbia albida total wood mass from DBH (Eq. 3.7) · Ambomo Tsanga et al. 2026 · DBH
- Pruned Faidherbia albida total wood mass from D and H (Eq. 3.6) · Ambomo Tsanga et al. 2026 · DBH + Height
- Faidherbia albida in parklands, DBH only (M1, selected) · Darcha et al. 2025 · DBH
- Faidherbia albida in parklands, stump-height diameter (M2) · Darcha et al. 2025 · D30
- Pruned Faidherbia albida total wood mass from DBH (Eq. 3.7) · same paper · Aboveground biomass, without leaves
- Pruned Faidherbia albida total wood mass from D and H (Eq. 3.6) · same paper · Aboveground biomass, without leaves