Tree Allometrics

Acacia mangium / Aboveground biomass

Acacia mangium (2nd generation) plantation, Sarawak, AGB from D (power)

Aboveground biomassAcacia mangium · FabaceaeMalaysiaplantationRead from the original paper
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Equation

As printed (Table 2, model 2)

y = 0.1173D2.454

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

Aboveground biomass = 0.1173 * D^2.454
D
Diameter at breast height (1.3 m), cm

About 10-year-old stand. AGB is the sum of stem, branch and leaf dry mass. The paper also prints linear, exponential and logarithmic fits (Table 2) but rejects them (negative predictions for small trees); only the power model, which the authors select, is included.

Source
Thirty five trees of second generation A. mangium
Trees measured · Field Sampling
The DBH of felled Acacia hybrid and second generation A. mangium ranged from 12.8 to 40.9 cm and 11.6 to 41.5 cm, respectively
Smallest DBH · Results and Discussion, Aboveground Biomass Models
Trees measured
35
DBH range
11.6–41.5 cm
R²
0.94
Method
power regression of dry AGB on DBH
Where
Daiken Sarawak plantation, Bintulu district, Sarawak
Last checked
2026-11-02
Calculate
90.2
Aboveground biomass (kg)
42.4
Carbon (kg), ×0.47
156
CO₂e (kg), ×44/12
Fitted DBH range02004006008001,0001,200510152025303540DBH (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 = 1590.290.2Computed from the printed form
computed from the published form (coefficients as printed)
D = 25316316Computed from the printed form
computed from the published form (coefficients as printed)
D = 401,0021,002Computed from the printed form
computed from the published form (coefficients as printed)

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