Pseudotsuga menziesii / Aboveground biomass
North American taxa group: Pseudotsuga (Table 5)
Aboveground biomassPseudotsuga menziesii · PinaceaeUnited StatesmixedRead from the original paper
© Danny Steaven · CC BY-SA · iNaturalistEquation
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(-2.4623 + 2.4852 * ln(D))D- Diameter at breast height (1.3 m), cm
Fitted for the Pseudotsuga taxon, whose 23 equations are all for Douglas-fir, so it is recorded as a species fit. The authors suggest it also for Taxus and Torreya. Median specific gravity of the group: 0.45. Diameter range is that of the pseudodata. R² is the published 'R²-statistic'.
Source
doi:10.1093/forestry/cpt053 · Open access · copy we read
Pseudotsuga 0.45 −2.4623 2.4852 253 23 dbh 3–215 0.86
Pseudotsuga menziesii Douglas-fir 202 0.45 23
we did not include a correction (Baskerville, 1972) for underestimation
- DBH range
- 3–215 cm
- R²
- 0.86
- Method
- Weighted regression of ln(biomass) on ln(dbh) fitted to 253 pseudodata points generated from 23 published equations; no back-transform correction
- Where
- United States (equations compiled from US and Canadian studies)
- Last checked
- 2026-11-03
Calculate
400
Aboveground biomass (kg)
188
Carbon (kg), ×0.47
689
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 | 400 | 400 | Computed from the printed form computed from the published form at dbh = 30 cm |
Related
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