Pinus caribaea / Stem biomass
Pinus caribaea trunk (stem with bark) biomass from DBH, height and wood density (simultaneous fit)
Stem biomassPinus caribaea var. hondurensis · PinaceaeBrazilplantationRead from the original paper
© Ben Machado · CC BY · iNaturalistEquation
As printed (Table 5)
bstrunk = β0+β1DBH+β2ht+β3ρ: -41.5, 1.760, 1.374, 39.377
In this library's units, ready to compute (kg)
Stem biomass = -41.5 + 1.760*D + 1.374*H + 39.377*rhoD- Diameter at breast height (1.3 m), cm
H- Total tree height, m
rho- Wood density (oven-dry mass / green volume), g/cm³
Ten-year-old plantation, 3 m x 3 m spacing, 20 trees. The paper writes the height symbol as ht in this row (TH elsewhere) and gives wood density rho in g/cm3 (stand mean 0.44). Trunk is with bark. 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 0.84
- Trees measured
- 20
- DBH range
- 8.2–23.7 cm
- Height range
- 6.4–14.2 m
- R²
- 0.84
- 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
Height from
9.31
Stem biomass (kg)
4.38
Carbon (kg), ×0.47
16
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, H = 9, rho = 0.44 | 9.31 | 9.31 | Computed from the printed form computed from the published form |
| D = 20, H = 13, rho = 0.5 | 31.3 | 31.3 | Computed from the printed form computed from the published form |
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