Equations / Stem biomass
Tectona grandis stem (wood + bark) biomass from D²H
As printed (Table 3)
In this library's units, ready to compute (kg)
Stem biomass = 0.031 * (D^2*H)^0.932D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
General (multi-site) equation fitted on pooled data compiled from published Thai plantation studies (theses, proceedings, reports), not on new felled trees; validated by the authors on independent harvests. D in cm, H in m, output kg dry weight per tree. AGB is the sum of stem, branches and leaves. Component symbol in the paper: Ws. The paper labels Wb as bark in its tables but as branches in the text, so no branch or bark model is entered.
doi:10.1016/j.anres.2015.08.001 · Open access · copy we read
12 datasets with a total of 84 trees were chosen for T. grandis
The ranges in the diameters and heights of trees in the dataset were 4.4–41.2 cm and 5.5–31.0 m for T. grandis, and 0.5–19.8 and 1.7–26.0 m for E. camaldulensis
Linear regressions of untransformed data were used in the present study because log transformed data introduced a systematic bias
- Trees measured
- 84
- DBH range
- 4.4–41.2 cm
- Height range
- 5.5–31 m
- R²
- 0.988
- Method
- Least-squares power regression on untransformed data (weighted data from 12-13 published datasets)
- Where
- Plantations across Thailand
- 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 = 15, H = 14 | 56.5 | 56.5 | Computed from the printed form computed from the published form |
| D = 25, H = 20 | 204 | 204 | Computed from the printed form computed from the published form |
Related
- Tectona grandis stem (wood + bark) biomass from D · Ounban et al. 2016 · DBH
- Eucalyptus camaldulensis AGB from D · same paper · Aboveground biomass
- Eucalyptus camaldulensis AGB from D²H · same paper · Aboveground biomass
- Eucalyptus camaldulensis leaf biomass from D²H · same paper · Foliage biomass
- Eucalyptus camaldulensis stem (wood + bark) biomass from D · same paper · Stem biomass
- Eucalyptus camaldulensis stem (wood + bark) biomass from D²H · same paper · Stem biomass
- Tectona grandis AGB from D · same paper · Aboveground biomass
- Tectona grandis AGB from D²H · same paper · Aboveground biomass
- Tectona grandis leaf biomass from D²H · same paper · Foliage biomass