Acacia mangium / Root biomass
Planted Acacia mangium, West Java, root biomass from D, all ages (model B)
Root biomassAcacia mangium · FabaceaeIndonesiaplantationRead from the original paper
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Equation
As printed (Table 6, model B, stand age 3-10)
Y = a·dbh^b; a = 0.0058, b = 2.821, r2 = 0.9883
In this library's units, ready to compute (kg)
Root biomass = 0.0058 * D^2.821D- 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
- 0.9883
- 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
0.544
Root biomass (kg)
0.255
Carbon (kg), ×0.47
0.937
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 | 0.544 | 0.544 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 10 | 3.84 | 3.84 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 20 | 27.1 | 27.1 | Computed from the printed form computed from the published form (coefficients as printed) |
Related
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- Planted Acacia mangium, West Java, aboveground biomass from D, 10-year stand (model A) · same paper · Aboveground biomass
- Planted Acacia mangium, West Java, aboveground biomass from D, 3-year stand (model A) · same paper · Aboveground biomass
- Planted Acacia mangium, West Java, aboveground biomass from D, 5-year stand (model A) · same paper · Aboveground biomass
- Planted Acacia mangium, West Java, aboveground biomass from D, 8-year stand (model A) · same paper · Aboveground biomass
- Planted Acacia mangium, West Java, aboveground biomass from D, all ages (model B) · same paper · Aboveground biomass
- Planted Acacia mangium, West Java, branch biomass from D, all ages (model B) · same paper · Branch biomass
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- Planted Acacia mangium, West Java, stem biomass from D, all ages (model B) · same paper · Stem biomass