Equations / Total volume
Tanzania lowland forest, Dindili and Rondo combined, total volume, D only (model 7)
Total volumeMixed lowland forest tree speciesTanzanianaturalRead from the original paper
Many species, no single photo
Equation
As printed (Table 3 (columns: a, b, c, error, RMSE, R2, AIC))
Total tree volume General 7 −0.0393 0.00102 — 0.013 × dbh0.5 0.85 0.95 92.06
In this library's units, ready to compute (m³)
Total volume = -0.0393 + 0.00102 * D^2D- Diameter at breast height (1.3 m), cm
Fitted by maximum-likelihood non-linear regression with a variance function, no back-transformation. Table 3 column "R2" is stored as r2. Total volume is stem plus branches. Table 3 prints the model forms (6)-(10) as images; they were read from the rendered equations. Model (7) is Y = a + b × dbh².
Source
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
- 60
- R²
- 0.95
- Method
- maximum-likelihood non-linear regression with variance function
- Where
- Dindili (Morogoro) and Rondo (Lindi) lowland forests, Tanzania
- Last checked
- 2026-11-02
Calculate
0.369
Total volume (m³)
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 = 20 | 0.369 | 0.369 | Computed from the printed form hand-computed from the published form |
| D = 50 | 2.51 | 2.51 | Computed from the printed form hand-computed from the published form |
Related
- Tanzania lowland forest, Dindili and Rondo combined, total volume, D and H (model 8) · Mugasha et al. 2016 · 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, Rondo (wet lowland forest), D, H and wood density (model 10) · same paper · Aboveground biomass
- Tanzania lowland forest, Dindili and Rondo combined, total volume, D and H (model 8) · same paper · Total volume