Betula populifolia / Foliage biomass
Canadian national equation, grey birch, dbh and height (foliage; Table 4)
© Homer Edward Price · CC BY · iNaturalistAs printed (Eq. 3)
In this library's units, ready to compute (kg)
Foliage biomass = 0.0455 * D^2.6447 * H^(-1.4955)D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Foliage is leaves and twigs. r2 is the adjusted R² (AdjRSq) of this compartment in Table 5. Fitted on the original scale (weighted nonlinear seemingly unrelated regression), so there is no back-transform correction. Dead branches, cones and fruits are not part of aboveground biomass in this work (Materials). Stand type was not always recorded. Ung, Bernier & Guo (2008) later revised parameters for some species with British Columbia data; not used here.
doi:10.1139/x05-112 · Paywalled · copy we read
bfoliage1 0.0455
bfoliage2 2.6447
bfoliage3 –1.4955
Grey birch 43 10.3±0.8 8.9±0.5 39.8±6.9
(2.2;22.7) (2.3;14.9) (0.6;181.0)
Foliage 0.0001 0.81 0.5 2.90 0.0008 0.67 0.7 2.18
- Trees measured
- 43
- DBH range
- 2.2–22.7 cm
- Height range
- 2.3–14.9 m
- R²
- 0.67
- Method
- Nonlinear seemingly unrelated regression with weight functions; additivity constrained so compartments sum to total
- Where
- Nova Scotia, Canada (ENFOR archival data, early 1980s)
- Last checked
- 2026-11-03
Outside the data this model was fitted on: height above the fitted 14.9 m. Results may be unreliable.
Shaded: the DBH range the model was fitted on. Other inputs held at the values above.
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 = 20, H = 15 | 2.19 | 2.19 | Computed from the printed form computed from the published form at dbh = 20 cm, H = 15 m |
Related
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