Equations / Aboveground biomass, without leaves
Restinga forest, Rio de Janeiro, DBH and height (Spurr, Model 2)
As printed (Table 2 (model forms in Table 1))
In this library's units, ready to compute (kg)
Aboveground biomass, without leaves = 1000 * (0.05 + 1.83e-05 * D^2 * H)D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Table 2 gives coefficients only; the model forms are from Table 1 (Husch y = B0 d^B1; Spurr y = B0 + B1 (d2 h); Schumacher and Hall y = B0 d^B1 h^B2), fitted by non-linear GLS with a varPower variance function. Output unit Mg is from the Figure 2 caption (AGB, Mg); the table itself does not state it, and 1000 x converts to kg. AGB was built from non-destructively measured wood volume (stem and branches) times basic wood density, so foliage is excluded. Coefficients are rounded as printed. Fit r2 is the printed Ryy (correlation of real and estimated values). DBH range of the 172 sample trees not stated. Authors chose the Spurr model for restinga because Model 3 coefficients were not significant and the Model 1 B0 was not significant; only Model 2 added.
doi:10.3390/f15091568 · Open access · copy we read
37 to RF
- Trees measured
- 37
- R²
- 0.8
- Method
- non-linear regression, generalised least squares with varPower variance
- Where
- Rio de Janeiro state, Atlantic Forest Domain
- 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 = 15, H = 12 | 99.4 | 99.4 | Computed from the printed form hand-computed from the published form (Mg x 1000 = kg) |
| D = 40, H = 22 | 694 | 694 | Computed from the printed form hand-computed from the published form (Mg x 1000 = kg) |
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