Equations / Root biomass
Caribbean Costa Rica secondary forest (35 species), root biomass from DBH
Root biomassSecondary forest trees, 35 species (highest-IVI species per diameter class)Costa RicanaturalRead from the original paper
Many species, no single photo
Equation
As printed (Cuadro 2, Bosque secundario)
Bra = exp(-3,98702 + 2,48739*ln(d)) 91,25 0,5053 – 122 1,14
In this library's units, ready to compute (kg)
Root biomass = 1.14 * exp(-3.98702 + 2.48739 * ln(D))D- Diameter at breast height (1.3 m), cm
Root (Bra) dry biomass per tree from excavated root systems, secondary forests 3–20 years old. FC = 1,14 multiplied in. The secondary-forest total-biomass model in Cuadro 2 is not included: it is printed as 'Log(Bt) = -1,80246 + 2,28927*ln(d)' with Log defined as base 10, which gives implausible values; the base is ambiguous.
Source
doi:10.4067/S0717-92002009000100006 · Open access · copy we read
En estos bosques la muestra fue de 160 árboles correspondientes a 35 especies, cuyo diámetro varió entre 2,8 cm y 28,2 cm
Los modelos seleccionados con transformaciones logarítmicas fueron corregidos utilizando un factor de corrección (FC)
- Trees measured
- 122
- DBH range
- 2.8–28.2 cm
- R²
- 0.9125
- Residual SE
- 0.5053
- Correction factor
- 1.14 (applied)
- Method
- OLS on ln(Bra) vs ln(d); Sprugel correction factor
- Where
- Caribbean (Atlantic) lowlands of Costa Rica
- Last checked
- 2026-11-01
Calculate
17.8
Root biomass (kg)
8.37
Carbon (kg), ×0.47
30.7
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 = 15 | 17.8 | 17.8 | Computed from the printed form computed from the Cuadro 2 model times FC 1,14 |
Related
- Hieronyma alchorneoides plantations, total tree biomass incl. roots (Bt) · same paper · Total biomass
- Vochysia guatemalensis plantations, total tree biomass incl. roots (Bt) · same paper · Total biomass