Betula populifolia / Aboveground biomass
Canadian national equation, grey birch, dbh only (sum of wood, bark, branches, foliage; Table 3)
© Homer Edward Price · CC BY · iNaturalistAs printed (Eq. 2)
In this library's units, ready to compute (kg)
Aboveground biomass = 0.072 * D^2.3885 + 0.0168 * D^2.2569 + 0.0088 * D^2.5689 + 0.0099 * D^1.8985D- Diameter at breast height (1.3 m), cm
Total aboveground biomass = wood + bark + branches + foliage, each fitted as its own equation; the total is their sum (additivity by construction). 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
y bark = β bark1D βbark2 + e bark
y branches = β branches1D βbranches2 + e branches
y foliage = β foliage1D βfoliage2 + efoliage
Grey birch bwood1 0.0720
bwood2 2.3885
bbark1 0.0168
bbark2 2.2569
bbranches1 0.0088
bbranches2 2.5689
bfoliage1 0.0099
bfoliage2 1.8985
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)
Total 0.0016 0.94 11.1 3.92 0.0050 0.96 9.0 3.33
- Trees measured
- 43
- DBH range
- 2.2–22.7 cm
- R²
- 0.94
- 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
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 | 129 | 129 | Computed from the printed form computed from the published form at dbh = 20 cm |
Related
- North American taxa group: Betulaceae 0.50–0.59 spg (Table 5) · Chojnacky et al. 2014 · DBH
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