Equations / Aboveground biomass
North American taxa group: Picea < 0.35 spg (Table 5)
Aboveground biomassPicea < 0.35 spg (Picea engelmannii, P. sitchensis) · PinaceaeUnited StatesmixedRead from the original paper
Fitted on these 2 species: Picea engelmannii, Picea sitchensis
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(-3.03 + 2.5567 * ln(D))D- Diameter at breast height (1.3 m), cm
Western low-specific-gravity spruces: Engelmann and Sitka. 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
Picea < 0.35 spg 0.33 −3.0300 2.5567 128 8 dbh 3–283 0.81
Picea engelmannii Spruce, Engelmann 93 0.33 5
we did not include a correction (Baskerville, 1972) for underestimation
- DBH range
- 3–283 cm
- R²
- 0.81
- Method
- Weighted regression of ln(biomass) on ln(dbh) fitted to 128 pseudodata points generated from 8 published equations; no back-transform correction
- Where
- United States (equations compiled from US and Canadian studies)
- Last checked
- 2026-11-03
Calculate
289
Aboveground biomass (kg)
136
Carbon (kg), ×0.47
498
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 | 289 | 289 | Computed from the printed form computed from the published form at dbh = 30 cm |
Related
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- 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