Equations / Aboveground biomass
Acacia mearnsii Aboveground biomass from D and H (Table 3, model 1)
© Chris Ecroyd · CC BY · iNaturalistAs printed (Table 3, AGB model 1; Conclusion)
In this library's units, ready to compute (kg)
Aboveground biomass = 1.92 + 0.02 * (D * H)^1.68D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Coefficients are printed to two decimals only, so predictions are coarse for small trees. D is DBH in cm, H in m, biomass in kg (Table 2). Trees aged 3 to 6 years. R2 printed as a percentage and converted to a fraction. Table 3 was read from the journal CSV download; the column order is a, b, c, R2, RMSE, MAD, AIC, p. Stem, AGB and total biomass model 1 are the best models per the authors. Branch and leaf models are not added (Table 3: R2 about 0.5 for branches and about 0.6 for leaves).
doi:10.1080/21580103.2024.2366831 · Open access · copy we read
twenty-four trees of varying ages (3, 4, 5, and 6 years) were harvested
Tree parameters DBH (cm) 24 1.1 7.1 11.9; Height (m) 24 2.1 4.4 6.8 (n, min, mean, max)
- Trees measured
- 24
- DBH range
- 1.1–11.9 cm
- Height range
- 2.1–6.8 m
- R²
- 0.9749
- Method
- nonlinear regression, form a + b(DH)^c
- Where
- Farmer-managed woodlots, northwestern Ethiopia (Amhara)
- Last checked
- 2026-11-02
Shaded: the DBH range the model was fitted on. Other inputs held at the values above.
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 = 3, H = 2.5 | 2.51 | 2.51 | Computed from the printed form computed from the published form |
| D = 7, H = 4.4 | 8.26 | 8.26 | Computed from the printed form computed from the published form |
| D = 11, H = 6.5 | 28 | 28 | Computed from the printed form computed from the published form |
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- Planted Acacia mangium, West Java, aboveground biomass from D, 10-year stand (model A) · Miyakuni et al. 2004 · DBH
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- Planted Acacia mangium, West Java, aboveground biomass from D, all ages (model B) · Miyakuni et al. 2004 · DBH
- Acacia mearnsii belowground biomass from D and H (Table 3, model 3) · same paper · Root biomass
- Acacia mearnsii Stem biomass from D and H (Table 3, model 1) · same paper · Stem biomass
- Acacia mearnsii Total tree biomass from D and H (Table 3, model 1) · same paper · Total biomass