Equations / Branch biomass
Pinus caribaea branch biomass from DBH (simultaneous fit)
Branch biomassPinus caribaea var. hondurensis · PinaceaeBrazilplantationRead from the original paper
© Ben Machado · CC BY · iNaturalistEquation
As printed (Table 5)
bsbranches = β0+β1DBH+β2DBH2: 8.631, -1.213, 0.054
In this library's units, ready to compute (kg)
Branch biomass = 8.631 - 1.213*D + 0.054*D^2D- Diameter at breast height (1.3 m), cm
Ten-year-old plantation, 3 m x 3 m spacing, 20 trees. Quadratic in DBH; low R2adj (0.23) and positive intercept, so poor outside the sample range. Fitted simultaneously (Table 5).
Source
doi:10.1590/2179-8087.045216 · Open access · copy we read
Twenty (20) trees from the experimental area of the State University of Southwest Bahia (UESB), Vitória da Conquista, Bahia, Brazil, were measured and weighed
with a minimum value of 8.20 cm and a maximum of 23.70 cm; average total height of 11.06 m, ranging from 6.40 m to 14.20 m
R2adj 0.23
- Trees measured
- 20
- DBH range
- 8.2–23.7 cm
- Height range
- 6.4–14.2 m
- R²
- 0.23
- Method
- Simultaneous (SUR) linear regression ensuring additivity; R2 reported is adjusted R2
- Where
- Experimental area of UESB, Vitória da Conquista, Bahia
- Last checked
- 2026-11-02
Calculate
1.851
Branch biomass (kg)
0.87
Carbon (kg), ×0.47
3.19
CO₂e (kg), ×44/12
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 = 12 | 1.85 | 1.85 | Computed from the printed form computed from the published form |
| D = 20 | 5.97 | 5.97 | Computed from the printed form computed from the published form |
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