Equations / Aboveground biomass
Campo-Ma'an AGB from DBH, height and wood density (Table 3, model 5)
As printed (Table 3, Total biomass, model 5 and footnote a)
In this library's units, ready to compute (kg)
Aboveground biomass = exp(-2.3325 + 0.1651 * ln(D)^2 + 0.6620 * ln(D^2 * H) + 0.1309 * ln(rho))D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
rho- Wood density (oven-dry mass / green volume), g/cm³
Best-fitting site equation (lowest RSE, average error 3.4%). Printed form has the intermediate coefficient for ln(D²H) as c and β for ln(ρ) from the table footnote. Coefficients are used as printed; the paper does not state that the log-scale back-transformation correction factor is included, so none is applied. Reported R² is the adjusted R². Table 3 fit on 71 trees (7 of its equations captured). The Discussion (p. 1880) refits on 91 trees and recommends slightly different coefficients, printed without n, RSE or R²; this file keeps the Table 3 fit. The paper notes only three of the 71 trees were above 10 cm. The text calls the best three-variable fit 'model 14' (with a (ln D)³ term), but Table 3 model 5, the only place coefficients are printed, has none; this file follows Table 3.
doi:10.1016/j.foreco.2010.08.034 · Paywalled · copy we read
N 71, RSE 0.291, Adj. R2 0.9659, D (cm) 1–79
- Trees measured
- 71
- DBH range
- 1–79 cm
- R²
- 0.9659
- Residual SE
- 0.291
- Method
- log-log regression
- Where
- Campo-Ma'an, southern Cameroon
- Last checked
- 2026-11-01
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 = 30, H = 25, rho = 0.64 | 470.2 | 470.2 | Computed from the printed form hand-computed from the published form |
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