Tree Allometrics

Acacia melanoxylon / Aboveground biomass

Acacia melanoxylon AGB in Andean agroforestry, sum of SUR component models (DBH, height)

Aboveground biomassAcacia melanoxylon · FabaceaeEcuadoragroforestryRead from the original paper
Photo of Acacia melanoxylon
CC0 · iNaturalist
Equation

As printed (Tabla 4, Acacia, Fuste)

W f = 0,083622*DBH 1,826783 *Ht 0,689611

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

Aboveground biomass = 0.083622 * D^1.826783 * H^0.689611 + 0.365815 * D^2 - 1.044164 * H - 0.170251 * D * H
D
Diameter at breast height (1.3 m), cm
H
Total tree height, m

Introduced species widely planted in Andean agroforestry. Total aboveground dry biomass (kg) is the sum of the four Tabla 4 component equations; exponents printed as superscripts in the stem model.

Source
W rg = 0,101503*DBH2 – 1,044164*Ht
Equation · Tabla 4, Acacia, Ramas gruesas
W rd = 0,144577*DBH2 - 0,094715*DBH*Ht
Equation · Tabla 4, Acacia, Ramas delgadas
W h = 0,119735*DBH2 - 0,075536*DBH*Ht
Equation · Tabla 4, Acacia, Hojas
Biomasa total 44,34 0,906
R² · Tabla 4, Acacia (RMSE kg, R2 ajustado)
Acacia 30 22,4 4,4 13,4 31,5 17,9 2,4 11,3 24,3
Smallest DBH · Tabla 1
Trees measured
30
DBH range
13.4–31.5 cm
Height range
11.3–24.3 m
R²
0.906
Method
Component models (stem, coarse branches, thin branches, leaves) fitted by SUR; total = sum of components
Where
Two INIAP agroforestry systems, inter-Andean western cordillera of northern/central Ecuador, above 3000 m (Bosque Siempreverde Montano Alto)
Last checked
2026-11-01
Calculate
Height from
276
Aboveground biomass (kg)
130
Carbon (kg), ×0.47
475
CO₂e (kg), ×44/12
Fitted DBH range02004006008001,0001,2001,40010203040DBH (cm)Aboveground biomass (kg)Aboveground biomass

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%.

InputsExpectedWe getFrom
D = 22.4, H = 17.9276276Computed from the printed form
computed at the sample means (observed mean Wt 286,8 kg, Tabla 1)

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