Pinus halepensis / Stem biomass
Pinus halepensis stem biomass from DBH and height (combined variable)
As printed (Cuadro 4 (Bf, modelo 2); R2 ajustada 0.85 in Cuadro 5)
In this library's units, ready to compute (kg)
Stem biomass = exp(-1.198 + 0.633*ln(D^2*H))D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Bf model 2, selected for P. halepensis in Resultados (modelo 2 for Bhr, Bf and Bt). The Cuadro 4 row lists the intercept then the slope. Leaves-branches (Bhr) model 2 is not stored: it combines two components with no matching output quantity. Decimal point in the original. Plantation 22 years old. Biomass by the indirect Adelaide method (leaves-branches by reference branch, stem by Smalian volume times basic density), so the stem and total values are not weighed directly. Cuadro 5 R2 is the adjusted R2. The paper prints no correction factor for the ln back-transform, so none is applied. Ranges are from Cuadro 2 (n = 50).
doi:10.29298/rmcf.v9i47.172 · Open access · copy we read
ln B = β0 + β1 ln(Dn2 H) + ε
con una muestra de 50 árboles por especie
- Trees measured
- 50
- DBH range
- 6.9–22.8 cm
- Height range
- 3.1–6.7 m
- R²
- 0.85
- Method
- ln-ln least squares in R; no correction factor stated
- Where
- Cuauhtémoc and El Recreo ejidos, Saltillo, Coahuila
- Last checked
- 2026-11-02
Shaded: the DBH range the model was fitted on. Other inputs held at the values above.
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 = 8, H = 4 | 10.1 | 10.1 | Computed from the printed form computed from the published form (coefficients as printed, no correction factor) |
| D = 14, H = 5 | 23.6 | 23.6 | Computed from the printed form computed from the published form (coefficients as printed, no correction factor) |
| D = 21, H = 6 | 44.3 | 44.3 | Computed from the printed form computed from the published form (coefficients as printed, no correction factor) |
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- Pinus cembroides total aboveground biomass from DBH (quadratic in ln D) · same paper · Aboveground biomass
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