Equations / Aboveground biomass
Spotted gum AGB from DBH (Eq. 3)
Aboveground biomassCorymbia citriodora subsp. variegata · MyrtaceaeAustraliaplantationRead from the original paper
© Greg Tasney · CC BY-SA · iNaturalistEquation
As printed (Table 4, Eq. (3); form in Table 2)
(3) 0.08220 2.64134 (α, β) for AGB = α × Dβ
In this library's units, ready to compute (kg)
Aboveground biomass = 0.0822 * D^2.64134D- 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. The authors recommend this model (lowest cross-validated AIC, bias and MAPE).
Source
doi:10.3390/f13030486 · Open access · copy we read
We destructively sampled and weighed 52 sample trees, ranging from 11.8 to 42.0 cm in diameter at breast height
- Trees measured
- 52
- DBH range
- 11.8–42 cm
- Height range
- 12.6–32 m
- Method
- weighted nonlinear regression (nlme)
- Where
- Three plantation trials (451D, 451G, 13PHY), southeast Queensland
- Last checked
- 2026-11-02
Calculate
105
Aboveground biomass (kg)
49.37
Carbon (kg), ×0.47
181
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 = 15 | 105 | 105 | Computed from the printed form computed from the Table 4 parameter estimates |
| D = 30 | 655.3 | 655.3 | Computed from the printed form computed from the Table 4 parameter estimates |
Related
- Spotted gum AGB from DBH, 40-tree dataset (Eq. 10) · 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, 40-tree dataset (Eq. 10) · 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