Equations / Aboveground biomass

Spotted gum AGB from DBH, 40-tree dataset (Eq. 10)

Aboveground biomassCorymbia citriodora subsp. variegata · MyrtaceaeAustraliaplantationRead from the original paper

Photo of Corymbia citriodora subsp. variegata

Equation

As printed (Table 4, Eq. (10); form in Table 2)

(10) 0.10606 2.56803 (α, β) for AGB = α × Dβ

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

Aboveground biomass = 0.10606 * D^2.56803

D: Diameter at breast height (1.3 m), cm

Weighted nonlinear power model, so no back-transform correction applies. AGB is the total of stem, bark, large branches, small branches and leaves (Table 3), so foliage is included. Adjusted R² is printed in Table 4 but is not stored. Fitted on the 2020 mature-tree dataset only.

Source

Huynh, T., Lewis, T., Applegate, G., Pachas, A. N. A., & Lee, D. J. (2022). Allometric Equations to Estimate Aboveground Biomass in Spotted Gum (Corymbia citriodora Subspecies variegata) Plantations in Queensland. Forests, 13(3), 486.

doi:10.3390/f13030486 · Open access · copy we read

in 2020, the second dataset consisted of 40 sample trees ... (D ranges 17.1–42.0 cm)

Trees measured · Section 2.1

Trees measured: 40
DBH range: 17.1–42 cm
Method: weighted nonlinear regression (nlme)
Where: Three plantation trials (451D, 451G, 13PHY), southeast Queensland
Last checked: 2026-11-02

Calculate

DBH (cm)

232.6

Aboveground biomass (kg)

109.3

Carbon (kg), ×0.47

400.9

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%.

Inputs	Expected	We get	From
D = 20	232.6	232.6	Computed from the printed form computed from the Table 4 parameter estimates
D = 38	1,209	1,209	Computed from the printed form computed from the Table 4 parameter estimates

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Spotted gum AGB from DBH (Eq. 3) · Huynh et al. 2022 · DBH
Spotted gum AGB from D and H (Eq. 5) · Huynh et al. 2022 · DBH + Height
Spotted gum AGB from D²H (Eq. 6) · Huynh et al. 2022 · DBH + Height
Spotted gum AGB from D, H and wood density (Eq. 8) · Huynh et al. 2022 · DBH + Height + Wood density
Spotted gum AGB from DBH (Eq. 3) · same paper · Aboveground biomass
Spotted gum AGB from D and H (Eq. 5) · same paper · Aboveground biomass
Spotted gum AGB from D²H (Eq. 6) · same paper · Aboveground biomass
Spotted gum AGB from D, H and wood density (Eq. 8) · same paper · Aboveground biomass

Compare these curves

Spotted gum AGB from DBH, 40-tree dataset (Eq. 10)

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