Betula alleghaniensis / Foliage biomass
Canadian national equation, yellow birch, dbh and height (foliage; Table 4)
© Douglas Goldman · CC BY-SA · iNaturalistAs printed (Eq. 3)
In this library's units, ready to compute (kg)
Foliage biomass = 0.1683 * D^1.2764D- Diameter at breast height (1.3 m), cm
Foliage is leaves and twigs. Height drops out of the foliage term: the paper leaves its height exponent blank (—, not significantly different from zero). 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 0.1683
bfoliage2 1.2764
bfoliage3 —
Yellow birch 280 25.7±0.9 16.4±0.3 494.4±34.4
(0.8;70.3) (2.7;25.6) (0.1;2951.4)
Foliage 0.3125 0.41 7.6 1.45 0.5722 0.45 7.4 1.25
- Trees measured
- 280
- DBH range
- 0.8–70.3 cm
- Height range
- 2.7–25.6 m
- R²
- 0.45
- Method
- Nonlinear seemingly unrelated regression with weight functions; additivity constrained so compartments sum to total
- Where
- Canada: Newfoundland and Labrador, Ontario, Quebec (ENFOR archival data, early 1980s)
- Last checked
- 2026-11-03
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 | 7.7 | 7.7 | Computed from the printed form computed from the published form at dbh = 20 cm, H = 15 m |
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