Equations / Aboveground biomass
Tanzania lowland forest, Rondo (wet lowland forest), D, H and wood density (model 10)
As printed (Table 5 (columns: a, b, c, error, RMSE, R2, AIC))
In this library's units, ready to compute (kg)
Aboveground biomass = 0.07511 * (rho * D^2 * H)^0.9477rho- Wood density (oven-dry mass / green volume), g/cm³
D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Fitted by maximum-likelihood non-linear regression with a variance function, no back-transformation. Table 5 column "R2" is stored as r2. Total AGB is the sum of stump, stem, branches, twigs and leaves, so foliage is included. Wood density WD is the tree's sample-disc basic density (g/cm³). The rendered equation (10) shows "Y^1 = a × (WD × dbh² × ht)^b"; the superscript 1 on Y is read as a typesetting artefact.
doi:10.1155/2016/8076271 · Open access · copy we read
where Y is the volume (m3 tree−1) or biomass (kg tree−1); WD is wood basic density (g cm−3); a, b, and c are model parameters to be estimated.
A total of 30 trees were selected from each site
- Trees measured
- 30
- R²
- 0.92
- Method
- maximum-likelihood non-linear regression with variance function
- Where
- Rondo Forest Reserve, Lindi, Tanzania (wet lowland forest)
- 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 |
|---|---|---|---|
| rho = 0.6, D = 20, H = 15 | 176 | 176 | Computed from the printed form hand-computed from the published form |
| rho = 0.8, D = 50, H = 25 | 2,133 | 2,133 | Computed from the printed form hand-computed from the published form |
Related
- Tanzania lowland forest, Dindili (dry lowland forest), D, H and wood density (model 10) · Mugasha et al. 2016 · Wood density + DBH + Height
- Tanzania lowland forest, Dindili (dry lowland forest), D and H (model 9) · Mugasha et al. 2016 · Height + DBH
- Tanzania lowland forest, Dindili and Rondo combined, D, H and wood density (model 10) · Mugasha et al. 2016 · Wood density + DBH + Height
- Tanzania lowland forest, Dindili (dry lowland forest), D, H and wood density (model 10) · same paper · Aboveground biomass
- Tanzania lowland forest, Dindili (dry lowland forest), D and H (model 9) · same paper · Aboveground biomass
- Tanzania lowland forest, Dindili and Rondo combined, D, H and wood density (model 10) · same paper · Aboveground biomass
- Tanzania lowland forest, Dindili and Rondo combined, total volume, D only (model 7) · same paper · Total volume
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