Brachystegia spiciformis / Stem volume
Brachystegia spiciformis stem merchantable volume from D2H
Stem volumeBrachystegia spiciformis · FabaceaeMozambiquenaturalRead from the original paper
© i_c_riddell · CC BY · iNaturalistEquation
As printed (Table 4, stem merchantable wood volume under bark, Model 2)
Y = 3.32 × 10−5 × (DBH2 × Ht)0.953
In this library's units, ready to compute (m³)
Stem volume = 3.32e-05 * (D^2 * H)^0.953D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Model 2 (DBH2 x Ht) was the best of the three models by AIC and BIC. Volume is merchantable wood under bark (stem or branches down to a 15 cm top diameter over bark), in m3. No correction factor is stated. Stem part only (from 15 cm diameter over bark).
Source
doi:10.3390/earth6020052 · Open access · copy we read
37 B. spiciformis trees (DBH ranging from 17 to 81cm and height ranging from 12 to 26 m)
- Trees measured
- 37
- DBH range
- 17–81 cm
- Height range
- 12–26 m
- Method
- Non-linear weighted power model, Y = b0 (DBH^2 Ht)^b1 x error
- Where
- Levasflor forests, Cheringoma district, Sofala province
- Last checked
- 2026-11-02
Calculate
Height from
0.287
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 = 30, H = 15 | 0.287 | 0.287 | Computed from the printed form computed from the published form |
| D = 50, H = 20 | 0.998 | 0.998 | Computed from the printed form computed from the published form |
Related
- Brachystegia spiciformis total merchantable volume from D2H · same paper · Total volume
- Julbernardia globiflora stem merchantable volume from D2H · same paper · Stem volume
- Julbernardia globiflora total merchantable volume from D2H · same paper · Total volume