Acacia mangium / Stem biomass
Planted Acacia mangium, West Java, stem biomass from D, all ages (model B)
Stem biomassAcacia mangium · FabaceaeIndonesiaplantationRead from the original paper
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Equation
As printed (Table 4, model B, stand age 3-10)
Y = a·dbh^b; a = 0.0323, b = 2.7515, r2 = 0.9921
In this library's units, ready to compute (kg)
Stem biomass = 0.0323 * D^2.7515D- Diameter at breast height (1.3 m), cm
Model B (the authors' recommended general equation): all four stand ages combined (3-10 yr). Fitted in log space (log-linear) and printed as a power law; the paper states no back-transformation correction factor and none is applied. The paper does not print the sampled dbh range. Aboveground biomass is the sum of the above-ground organs as defined by the authors (Yag).
Source
doi:10.20659/jfp.10.2_69 · Open access · copy we read
We selected 15 trees from the 3-year-old stand, 12 trees from the 5-year-old stand, 16 trees from the 8-year-old stand, and 16 trees from the 10-year-old stand
- Trees measured
- 59
- R²
- 0.9921
- Method
- log-linear least squares of Y = a·dbh^b
- Where
- Maribaya and Tenjo ranger districts (Parungpanjang), Perhutani, West Java
- Last checked
- 2026-11-02
Calculate
2.71
Stem biomass (kg)
1.27
Carbon (kg), ×0.47
4.66
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 = 5 | 2.71 | 2.71 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 10 | 18.2 | 18.2 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 20 | 123 | 123 | Computed from the printed form computed from the published form (coefficients as printed) |
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