Tree Allometrics

Equations / Stem biomass

Sonneratia alba stem biomass, exponential model (D)

Stem biomassSonneratia albaIndonesianaturalRead from the original paper
Photo of Sonneratia alba
© Oleg Kosterin · CC BY · iNaturalist
Equation

As printed (Table 3, Exponential row)

Exponential B = 4.884e^(0.127D) 93.1% 0.193

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

Stem biomass = 4.884 * exp(0.127 * D)
D
Diameter at breast height (1.3 m), cm

Stand origin is not stated in the paper; classified natural from its reference to natural forest stands. Fitted on 8 of the 14 felled trees (the other 6 were held out for validation); the paper prints no DBH range for the fitting trees.

Source
A total of 14 trees were felled to serve as measurement samples: 8 for model development and 6 for model validation.
Trees measured · Results and Discussion, p. 908
93.1%
R² · Table 3, Exponential row
Trees measured
8
R²
0.931
Method
exponential model B = a e^(bD)
Where
Tanah Merah Mangrove Forest, Kupang, East Nusa Tenggara
Last checked
2026-11-02
Calculate
22.4
Stem biomass (kg)
10.5
Carbon (kg), ×0.47
38.6
CO₂e (kg), ×44/12
0200400600800510152025303540DBH (cm)Stem biomass (kg)Stem 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 = 1222.422.4Computed from the printed form
computed from the published form (coefficients as printed)
D = 184848Computed from the printed form
computed from the published form (coefficients as printed)
D = 26133133Computed from the printed form
computed from the published form (coefficients as printed)

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