Equations / Aboveground biomass
Dry miombo, total AGB, All 44 species (trees and shrubs), D and H
As printed (Table 2, total biomass, model 3)
In this library's units, ready to compute (kg)
Aboveground biomass = 1.0167 * exp(-2.6896 + 1.9041 * ln(D) + 0.9377 * ln(H))D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
ln-ln OLS (species models) or linear mixed model with species random effect (group models); total aboveground biomass is stump + stem and branches + twigs and leaves, so foliage is included. The paper states CF = exp(RMSE²/2) and that it was applied to predictions; the CF value (1.0167) is not printed and is computed here from the printed RMSE (0.182) by that stated formula, and applied in both forms. The R² shown for group models is the likelihood-ratio R² named in the Table 2 note; for species models it is adjusted R².
doi:10.1155/2014/531256 · Open access · copy we read
CF = exp(RMSE2/2), which was applied to the predicted values of volume and biomass
Y is volume (m3) or biomass (kg); Dbh is diameter at breast height (cm); ht is total height (m); and wd is wood density (kg m−3).
The minimum and maximum sizes of sample trees/shrubs were 1.4 cm and 62.0 cm in diameter at breast height
- Trees measured
- 104
- DBH range
- 1.4–62 cm
- Height range
- 2.5–18.2 m
- R²
- 0.983
- Correction factor
- 1.0167 (applied)
- Method
- linear mixed model on ln-transformed data (species random effect)
- Where
- Gangalamtumba Village Land Forest Reserve, Iringa, Tanzania (dry miombo woodland)
- 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 = 20, H = 10 | 180 | 180 | Computed from the printed form hand-computed from the published form |
| D = 40, H = 14 | 921 | 921 | Computed from the printed form hand-computed from the published form |
Related
- Dry miombo, total AGB, All 44 species (trees and shrubs), D only · Mwakalukwa et al. 2014 · DBH
- Dry miombo, total AGB, All 44 species (trees and shrubs), D, H and wood density · Mwakalukwa et al. 2014 · Wood density + DBH + Height
- Dry miombo, total AGB, Brachystegia spiciformis, D and H · same paper · Aboveground biomass
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- Dry miombo, total AGB, All 44 species (trees and shrubs), D only · same paper · Aboveground biomass
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- Dry miombo, total AGB, Dalbergia arbutifolia, D and H · same paper · Aboveground biomass
- Dry miombo, total AGB, Trees (28 species), D and H · same paper · Aboveground biomass
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