Equations / Aboveground biomass
Retrophyllum rospigliosii AGB, DBH only (13-year restoration plantation)
As printed (Table 7, equation 20)
In this library's units, ready to compute (kg)
Aboveground biomass = 1.032 * exp(-1.945 + 2.194*ln(D))D- Diameter at breast height (1.3 m), cm
Table 7 gives the final equation with the correction factor e^(RSE^2/2) folded into the coefficient a; here the published form is written from the linear expression in Table 7 with the printed correction factor applied, which agrees with the printed a. Dry mass in kg, D in cm, WD in g/cm3. Trees harvested 2022-2023 in 13-year-old plantations; AGB sums leaves, twigs, branches and trunk. Ranges are for the sampled trees (Table 2). RSE is as printed in Table 5/6.
doi:10.1007/s11676-025-01827-w · Open access · copy we read
ln(AGB) = −1.945 + 2.194 ln(D)
e^(RSE²/2) = 1.032
20
- Trees measured
- 20
- DBH range
- 3.8–19 cm
- Height range
- 3.98–11.3 m
- R²
- 0.93
- Residual SE
- 0.263
- Correction factor
- 1.032 (applied)
- Method
- ln-ln linear regression (R 4.3.2), back-transformed with e^(RSE^2/2)
- Where
- Más Bosques para Medellín mixed restoration plantations, Aburrá valley, Medellín
- 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 | 14.1 | 14.1 | Computed from the printed form computed from the published form (linear expression with printed correction factor) |
| D = 15 | 56.1 | 56.1 | Computed from the printed form computed from the published form (linear expression with printed correction factor) |
| D = 25 | 172.2 | 172.2 | Computed from the printed form computed from the published form (linear expression with printed correction factor) |
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