Tectona grandis / Total biomass
Tectona grandis (teak), 20-year-old Panama plantations, total tree biomass incl. roots
Total biomassTectona grandis · LamiaceaePanamaplantationRead from the original paper
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Equation
As printed (Figure 4, equation 1 (thesis p. 55))
Log Tree B = 2.575(log DBH) - 1.042
In this library's units, ready to compute (kg)
Total biomass = 10^(2.575 * log10(D) - 1.042)D- Diameter at breast height (1.3 m), cm
Tree biomass B (kg dry mass) is the whole tree including excavated coarse and fine roots (Table 3 totals), so this is total above + below biomass; mean root:shoot ratio 0.157. log is base 10. SEE is on the log10 scale. Thesis precursor of Kraenzel et al. (2003) Forest Ecology and Management 173:213–225 (paywalled, not read); coefficients there may differ.
Source
r2 = 0.9778, SEE = 0.056 (equation 1)
diameter at breast height of the nine excavated trees ranged between 16.9 and 43.8 cm
Coarse Roots 14.2 31.4 28.8
- Trees measured
- 9
- DBH range
- 16.9–43.8 cm
- R²
- 0.9778
- Residual SE
- 0.056
- Method
- OLS on log10(tree biomass) vs log10(DBH); no correction factor reported
- Where
- Four harvest-age (about 20-year) teak plantations in Panama (Boquerón, Peñas Blancas, Tranquilla, Aguas Claras)
- Last checked
- 2026-11-01
Calculate
132
Total biomass (kg)
61.9
Carbon (kg), ×0.47
227
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 = 16.9 | 132 | 132 | Computed from the printed form computed from the published form at the smallest sampled DBH (observed totals ranged 122.1–1365.0 kg) |
| D = 43.8 | 1,530 | 1,530 | Computed from the printed form computed from the published form at the largest sampled DBH |