Equations / Total volume
Total tree volume from DBH (Eq. 8)
Total volumeSeven dominant canopy species (Carapa guianensis, Inga coruscans, Laetia procera, Pentaclethra macroloba, Stryphnodendron microstachyum, Tapirira guianensis, Vochysia ferruginea)Costa RicanaturalRead from the original paper
Many species, no single photo
Equation
As printed (Table 4, Eq. 8)
ln V tot = c + a ln DBH; c −7.15 ± 1.07; a 2.15 ± 0.24
In this library's units, ready to compute (m³)
Total volume = exp(-7.15 + 2.15 * ln(D))D- Diameter at breast height (1.3 m), cm
No back-transform correction factor is stated, so none is applied. Only trees with DBH ≥ 60 cm were harvested; the authors warn the models tend to overestimate outside 60-105 cm. Total volume = stem plus large and small branches. Adjusted R2 0.81.
Source
doi:10.1111/j.1744-7429.2005.02027.x · Open access · copy we read
19 individual trees were measured before harvest
adjusted well in the interval of diameters sampled (60–105 cm)
- Trees measured
- 19
- DBH range
- 60–105 cm
- R²
- 0.81
- Method
- Least-squares regression (SAS), r2 is the adjusted coefficient of determination
- Where
- Tirimbina (Sarapiquí) and Corinto (Guápiles), northern Costa Rica
- Last checked
- 2026-11-02
Calculate
9.693
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 = 80 | 9.69 | 9.69 | Computed from the printed form computed from the printed coefficients |
Related
- Total AGB from DBH squared, log form (Eq. 11) · same paper · Aboveground biomass
- Total AGB from DBH, power law (Eq. 12) · same paper · Aboveground biomass
- Total AGB from DBH and total height (Eq. 15) · same paper · Aboveground biomass
- Stem volume from DBH (Eq. 5) · same paper · Stem volume