Equations / Aboveground biomass
North American taxa group: Tsuga ≥ 0.40 spg (Table 5)
Aboveground biomassTsuga ≥ 0.40 spg (T. heterophylla, T. mertensiana) · PinaceaeUnited StatesmixedRead from the original paper
Fitted on these 2 species: Tsuga heterophylla, Tsuga mertensiana
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(-2.9208 + 2.5697 * ln(D))D- Diameter at breast height (1.3 m), cm
Western and mountain hemlock. Median specific gravity of the group: 0.42. Diameter range is that of the pseudodata. R² is the published 'R²-statistic'.
Source
doi:10.1093/forestry/cpt053 · Open access · copy we read
Tsuga ≥ 0.40 spg 0.42 −2.9208 2.5697 163 14 dbh 3–172 0.85
T. heterophylla Hemlock, western 263 0.42 10
we did not include a correction (Baskerville, 1972) for underestimation
- DBH range
- 3–172 cm
- R²
- 0.85
- Method
- Weighted regression of ln(biomass) on ln(dbh) fitted to 163 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
Calculate
337
Aboveground biomass (kg)
158
Carbon (kg), ×0.47
580
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 | 337 | 337 | Computed from the printed form computed from the published form at dbh = 30 cm |
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