Tree Allometrics

Tectona grandis / Stem biomass

Teak stem biomass, fertilized stands and unfertilized clonal stands (DBS)

Stem biomassTectona grandisBrazilplantationRead from the original paperPeer-reviewed source
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Equation

As printed (Table 2, model in caption; DBS row, Fertilized and clonal not fertilized columns β₀ and β₁, p. 5)

LnY = β₀ + β₁ Lndbh + ε; β₀ = −3.5300, β₁ = 2.6025

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

Stem biomass = exp(-3.5300 + 2.6025 * ln(D))
D
Diameter at breast height (1.3 m), cm

DBH is measured at 1.3 m. The log-linear model is back-transformed using Table 2's printed coefficients; the paper gives no correction factor, so none is applied. The authors instead recommend the all-stands fit because it is more robust.

Source
-3.5300 2.6025 0.9971
Equation · Table 2, DBS, Fertilized and clonal not fertilized, p. 5
ln Y = β0 + β1 ln DBH + ε (m1)
Equation · Materials and methods, p. 4
Estimates of the dry biomass of aerial part – DBAP (a), stem – DBS (b), wood – DBW (c)
Output · Figure 2 caption, p. 7
DBH (cm)
Units · Figure 2 horizontal axis, p. 7
DBS (kg/tree)
Units · Figure 2 vertical axis, p. 7
2) trees from fertilized stands and unfertilized clonal stands (15 trees, 12 clonal and 3 seminal);
Trees measured · Materials and methods, data sets, p. 4
-3.5300 2.6025 0.9971
R² · Table 2, DBS, Fertilized and clonal not fertilized, p. 5
The allometric model used was ln Y = β0 + β1 ln DBH + ε (m1)
method · Materials and methods, p. 4
young Tectona grandis stand
Taxon · Title, p. 1
Mato Grosso, Brazil
Where · Study area, p. 2
teak plantations
stand · Abstract, p. 1
Trees measured
15
R²
0.9971
Method
log-linear regression
Where
Mato Grosso, Brazil
Last checked
2026-11-05
Calculate
33.7
Stem biomass (kg)
15.8
Carbon (kg), ×0.47
58.1
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%.

InputsExpectedWe getFrom
D = 1533.733.7Computed from the printed form
Calculated from the Table 2 log-linear form at DBH 15 cm.

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