Equations / Aboveground biomass
North American taxa group: woodland Fagaceae (Table 5)
Aboveground biomassWoodland Fagaceae (Quercus douglasii, Q. gambelii, Q. hypoleucoides, Quercus (live) spp.) · FagaceaeUnited StatesmixedRead from the original paper
Fitted on these 3 species and others the paper does not name here: Quercus douglasii, Quercus gambelii, Quercus hypoleucoides
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(-3.0304 + 2.4982 * ln(DRC))DRC- Root collar / stem base diameter, cm
Woodland oaks (blue, Gambel, silverleaf and evergreen live oaks), by root-collar diameter. Root-collar diameter range of the pseudodata: 3–74 cm. Median specific gravity of the group: 0.59. R² is the published 'R²-statistic'.
Source
doi:10.1093/forestry/cpt053 · Open access · copy we read
Fagaceae 0.59 −3.0304 2.4982 36 5 drc 3–74 0.84
Fagaceae Q. gambelii Oak, Gambel 814 0.61 2
we did not include a correction (Baskerville, 1972) for underestimation
- R²
- 0.84
- Method
- Weighted regression of ln(biomass) on ln(drc) fitted to 36 pseudodata points generated from 5 published equations; no back-transform correction
- Where
- United States (equations compiled from US and Canadian studies)
- Last checked
- 2026-11-03
Calculate
237
Aboveground biomass (kg)
111
Carbon (kg), ×0.47
408
CO₂e (kg), ×44/12
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 |
|---|---|---|---|
| DRC = 30 | 237 | 237 | Computed from the printed form computed from the published form at drc = 30 cm |
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