Tree Allometrics

Tectona grandis / Stem biomass

Teak stem biomass, all sampled stands (DBS)

Stem biomassTectona grandisBrazilplantationRead from the original paperPeer-reviewed sourceNot fully checked

Not fully checked: The all-stands curve in Figure 2(b) conflicts with its printed equation and Table 2: at DBH 20 cm, Table 2 predicts 72.30 kg, while the plotted curve is below 45 kg. This record uses Table 2; confirm the discrepancy with the authors before using it.

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Equation

As printed (Table 2, model in caption; DBS row, All stands columns β₀ and β₁, p. 5)

LnY = β₀ + β₁ Lndbh + ε; β₀ = −3.5188, β₁ = 2.6036

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

Stem biomass = exp(-3.5188 + 2.6036 * 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. Figure 2 prints the rounded power form 0.0296 * DBH^2.6036. The authors recommend the all-stands fit.

Source
-3.5188 2.6036 0.9967
Equation · Table 2, DBS, All stands, 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
1) trees from all stands sampled (18 trees, 12 clonal and 6 seminal);
Trees measured · Materials and methods, data sets, p. 4
-3.5188 2.6036 0.9967
R² · Table 2, DBS, All stands, 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
18
R²
0.9967
Method
log-linear regression
Where
Mato Grosso, Brazil
Last checked
2026-11-05
Calculate
34.2
Stem biomass (kg)
16.1
Carbon (kg), ×0.47
58.9
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 = 1534.234.2Computed from the printed form
Calculated from the Table 2 log-linear form at DBH 15 cm.

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