Tree Allometrics

Raphia laurentii / Aboveground biomass

Raphia laurentii AGB from total palm height (m15, mean petiole diameter ≥5 cm)

Aboveground biomassRaphia laurentiiCongo - BrazzavillenaturalRead from the original paper
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Equation

As printed (Table 2, m15 row (AGB in kg dry mass); CF defined in Methods, p. 5)

m15 ln(AGB) = a + b × ln(H) -5.027 3.349 0.64 0.48 86.29 45.59 0.27 1.12

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

Aboveground biomass = 1.12 * exp(-5.027 + 3.349 * ln(H))
H
Total tree height, m

Whole-palm aboveground dry biomass (stem, sheaths, petioles, rachis and leaflets, so foliage is included). Total height is base of the stem to the highest point of the fronds. Fitted on palms with mean petiole diameter 5–15 cm (60 palms); ranges of the subset are not given. CF is the printed correction factor (rounded to 2 decimals) and is applied in the expression. Single-predictor model: the paper's better models use the sum of petiole diameters (not a canonical variable; not captured), so this is a fallback for when only diameter or height is measured. R² adj printed: 0.64; RSE 0.48 (Table 2).

Source
The aboveground biomass estimated from each logarithmic linear model was multiplied by the following correction factor
Note · Development of allometric equations, p. 5
Table 2 range (n): 5–15 cm (60)
Trees measured · Table 2, mean petiole diameter range (n) column
Trees measured
60
Correction factor
1.12 (applied)
Method
ln-ln linear regression times correction factor CF = exp(RSE²/2)
Where
Peat swamp forest near Bolembe, Likouala Department, Republic of the Congo
Last checked
2026-11-02
Calculate
Height from
7.77
Aboveground biomass (kg)
3.65
Carbon (kg), ×0.47
13.4
CO₂e (kg), ×44/12
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%.

InputsExpectedWe getFrom
H = 87.777.77Computed from the printed form
computed from the published form (coefficients and CF as printed)
H = 1339.539.5Computed from the printed form
computed from the published form (coefficients and CF as printed)
H = 18117117Computed from the printed form
computed from the published form (coefficients and CF as printed)

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