Equations / Aboveground biomass
North American taxa group: Abies ≥ 0.35 spg (Table 5)
Fitted on these 5 species and others the paper does not name here: Abies amabilis, Abies concolor, Abies grandis, Abies magnifica, Abies procera
As printed (Table 5 caption, p. 140)
In this library's units, ready to compute (kg)
Aboveground biomass = exp(-3.1774 + 2.6426 * ln(D))D- Diameter at breast height (1.3 m), cm
Western firs of higher specific gravity. The group also took equations for 'Abies spp.' (Pacific silver–noble–other firs). Median specific gravity of the group: 0.37. Diameter range is that of the pseudodata. R² is the published 'R²-statistic'.
doi:10.1093/forestry/cpt053 · Open access · copy we read
Abies ≥ 0.35 spg 0.37 −3.1774 2.6426 221 14 dbh 3–236 0.75
A. amabilis Fir, Pacific silver 11 0.40 4
we did not include a correction (Baskerville, 1972) for underestimation
- DBH range
- 3–236 cm
- R²
- 0.75
- Method
- Weighted regression of ln(biomass) on ln(dbh) fitted to 221 pseudodata points generated from 14 published equations; no back-transform correction
- Where
- United States (equations compiled from US and Canadian studies)
- Last checked
- 2026-11-03
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 = 30 | 334 | 334 | Computed from the printed form computed from the published form at dbh = 30 cm |
Related
- North American taxa group: Abies < 0.35 spg (Table 5) · same paper · Aboveground biomass
- North American taxa group: Aceraceae ≥ 0.50 spg (Table 5) · same paper · Aboveground biomass
- North American taxa group: Aceraceae < 0.50 spg (Table 5) · same paper · Aboveground biomass
- North American taxa group: Betulaceae 0.40–0.49 spg (Table 5) · same paper · Aboveground biomass
- North American taxa group: Betulaceae 0.50–0.59 spg (Table 5) · same paper · Aboveground biomass
- North American taxa group: Betulaceae ≥ 0.60 spg (Table 5) · same paper · Aboveground biomass
- North American taxa group: Betulaceae < 0.40 spg (Table 5) · same paper · Aboveground biomass
- North American taxa group: Fabaceae/Juglandaceae, Carya (Table 5) · same paper · Aboveground biomass