Equations / Total volume
Julbernardia globiflora total merchantable volume from D2H
Total volumeJulbernardia globiflora · FabaceaeMozambiquenaturalRead from the original paper
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Equation
As printed (Table 5, total tree merchantable wood volume under bark, Model 2)
Y = 6.98 × 10−6 × (DBH2 × Ht)1.196
In this library's units, ready to compute (m³)
Total volume = 6.98e-06 * (D^2 * H)^1.196D- 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. Total includes stem and large branches.
Source
doi:10.3390/earth6020052 · Open access · copy we read
23 J. globiflora trees (DBH ranging from 14 to 62 cm and height ranging from 12 to 23 m)
- Trees measured
- 23
- DBH range
- 14–62 cm
- Height range
- 12–23 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
0.608
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 = 30, H = 15 | 0.608 | 0.608 | Computed from the printed form computed from the published form |
| D = 50, H = 20 | 2.91 | 2.91 | Computed from the printed form computed from the published form |
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