Equations / Aboveground biomass
North American taxa group: Abies < 0.35 spg (Table 5)
Aboveground biomassAbies < 0.35 spg (Abies balsamea, A. fraseri, A. lasiocarpa) · PinaceaeUnited StatesmixedRead from the original paper
Fitted on these 3 species: Abies balsamea, Abies fraseri, Abies lasiocarpa
Equation
As printed (Table 5 caption, p. 140)
ln(biomass) = β0 + β1 ln(diameter)
In this library's units, ready to compute (kg)
Aboveground biomass = exp(-2.3123 + 2.3482 * ln(D))D- Diameter at breast height (1.3 m), cm
Low-specific-gravity firs: balsam, Fraser and subalpine fir. Median specific gravity of the group: 0.33. Diameter range is that of the pseudodata. R² is the published 'R²-statistic'.
Source
doi:10.1093/forestry/cpt053 · Open access · copy we read
Abies < 0.35 spg* 0.33 −2.3123 2.3482 131 20 dbh 3–69 0.75
Abies balsamea Fir, balsam 12 0.33 12
we did not include a correction (Baskerville, 1972) for underestimation
- DBH range
- 3–69 cm
- R²
- 0.75
- Method
- Weighted regression of ln(biomass) on ln(dbh) fitted to 131 pseudodata points generated from 20 published equations; no back-transform correction
- Where
- United States (equations compiled from US and Canadian studies)
- Last checked
- 2026-11-03
Calculate
291
Aboveground biomass (kg)
137
Carbon (kg), ×0.47
502
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 = 30 | 291 | 291 | 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