Tectona grandis / Stem volume
Teak stem volume from D and H (V5, generic)
Stem volumeTectona grandis · LamiaceaeNepalplantationRead from the original paper
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Equation
As printed (Abstract; Table 7, model V5)
V = [0.3364 + (0.0685 × dbh) + (−0.097 × H)]
In this library's units, ready to compute (m³)
Stem volume = 0.3364 + 0.0685 * D - 0.0970 * HD- Diameter at breast height (1.3 m), cm
H- Total tree height, m
In the paper H is the height predicted from the H2 equation (H*), not the measured height; with measured height the fit is not what the authors validated. Stump excluded from volume. R2 0.988 (adj. 0.985), RMSE 0.09 m3 (Table 7). The only candidate with all parameters significant.
Source
doi:10.31357/jtfe.v7i1.3020 · Open access · copy we read
31 (70 % of the data) were randomly selected to build the model
- Trees measured
- 31
- DBH range
- 6.37–58.92 cm
- Height range
- 5.7–26.1 m
- R²
- 0.988
- Method
- least squares on training set (31 of 44 felled trees)
- Where
- Sagarnath Forestry Development Project, Sarlahi district, central lowland Nepal
- Last checked
- 2026-11-02
Calculate
Height from
0.542
Stem 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, H = 12 | 0.542 | 0.542 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 35, H = 19 | 0.891 | 0.891 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 55, H = 24 | 1.78 | 1.78 | Computed from the printed form computed from the published form (coefficients as printed) |
Related
- Teak stem volume from D (V1, local) · Koirala et al. 2017 · DBH
- Teak height from D (H2, logarithmic) · same paper · Height
- Teak stem volume from D (V1, local) · same paper · Stem volume