Equations / Aboveground biomass
Short-stature boreal trees (<=4.5 m), AGB from stem diameter at 0.3 m (NLS)
As printed (Table 5 and Eq. 7)
In this library's units, ready to compute (kg)
Aboveground biomass = 59.072 * D30^2.479 / 1000D30- Stem diameter at 30 cm, cm
Total aboveground dry biomass (stem, branches, leaves) in grams; canonical form divides by 1000 for kg. Stem diameter measured 0.3 m along the stem from the ground. Paper gives the NLS and LLRC forms; the LLRC correction factor (epsilon = e^(MSE/2)) value is in Supplementary Table S4, which was not read, so LLRC is not added. n_trees omitted: text says 106 trees, Table 1 says 105 tree samples. Shrub volume/basal-diameter models and the cross-sectional-area models, the stem-length model and species-specific models not added (no canonical variable, or coefficients only in the supplement).
doi:10.3390/f11111207 · Open access · copy we read
NLS, Diameter at 0.3 m, R2 0.988
Live trees were chosen from the understory and open areas across different height ranges determined in intervals of 0.5 m up to ≤4.5 m
- Height range
- up to 4.5 m
- R²
- 0.988
- Method
- nonlinear least squares power function, y = beta * x^alpha (unweighted)
- Where
- Fort Liard area, Taiga Plains, Northwest Territories
- Last checked
- 2026-11-02
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 |
|---|---|---|---|
| D30 = 2 | 0.329 | 0.329 | Computed from the printed form computed from the published form (coefficients as printed) |
| D30 = 5 | 3.19 | 3.19 | Computed from the printed form computed from the published form (coefficients as printed) |
| D30 = 10 | 17.8 | 17.8 | Computed from the printed form computed from the published form (coefficients as printed) |