Tree Allometrics

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Campo-Ma'an AGB from D²H (Table 3, model 3)

Aboveground biomassMixed species, Campo-Ma'an lowland moist forestCameroonnaturalRead from the original paper

Many species, no single photo

Equation

As printed (Table 3, Total biomass, model 3)

3. ln(M) = a + b ln(D2 H) a = −3.0788 b = 0.9066

In this library's units, ready to compute (kg)

Aboveground biomass = exp(-3.0788 + 0.9066 * ln(D^2 * H))

D: Diameter at breast height (1.3 m), cm
H: Total tree height, m

H is total tree height in m. 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.

Source

Djomo, A.N., Ibrahima, A., Saborowski, J., Gravenhorst, G. (2010). Allometric equations for biomass estimations in Cameroon and pan moist tropical equations including biomass data from Africa. Forest Ecology and Management, 260(10), 1873–1885.

doi:10.1016/j.foreco.2010.08.034 · Paywalled · copy we read

N 71, RSE 0.328, Adj. R2 0.9561, D (cm) 1–79

Trees measured · Table 3, model 3

Trees measured: 71
DBH range: 1–79 cm
R²: 0.9561
Residual SE: 0.328
Method: log-log regression
Where: Campo-Ma'an, southern Cameroon
Last checked: 2026-11-01

Calculate

DBH (cm)Height (m)

Height from

406

Aboveground biomass (kg)

191

Carbon (kg), ×0.47

700

CO₂e (kg), ×44/12

Shaded: the DBH range the model was fitted on. Other inputs held at the values above.

Checks this equation passes

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	406	406	Computed from the printed form hand-computed from the published form

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Related

Campo-Ma'an AGB from DBH, height and wood density (Table 3, model 5) · Djomo et al. 2010 · DBH + Height + Wood density
Campo-Ma'an AGB from DBH and wood density (Table 3, model 4) · Djomo et al. 2010 · DBH + Wood density
Campo-Ma'an AGB from DBH (Table 3, model 2) · Djomo et al. 2010 · DBH
Campo-Ma'an AGB from DBH, height and wood density (Table 3, model 5) · same paper · Aboveground biomass
Campo-Ma'an AGB from DBH and wood density (Table 3, model 4) · same paper · Aboveground biomass
Campo-Ma'an AGB from DBH (Table 3, model 2) · same paper · Aboveground biomass
Pan moist tropical AGB from DBH, height and wood density (Table 4, model 5) · same paper · Aboveground biomass
Pan moist tropical AGB from DBH (Table 4, model 2) · same paper · Aboveground biomass
Pan moist tropical AGB from D²H (Table 4, model 3) · same paper · Aboveground biomass

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