Betula populifolia / Stem biomass
Canadian national equation, grey birch, dbh and height (stem wood plus stem bark; Table 4)
© Homer Edward Price · CC BY · iNaturalistAs printed (Eq. 3)
In this library's units, ready to compute (kg)
Stem biomass = 0.0295 * D^1.9064 * H^0.9139 + 0.0148 * D^1.8433 * H^0.5021D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Stem from ground level to tree top, stem wood plus stem bark; the stem is the sum of the two compartment equations. 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 βbark2Hβbark3 + e bark
Grey birch bwood1 0.0295
bwood2 1.9064
bwood3 0.9139
bbark1 0.0148
bbark2 1.8433
bbark3 0.5021
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)
Stem 0.0066 0.96 7.3 3.18 0.0035 0.98 4.8 3.11
- Trees measured
- 43
- DBH range
- 2.2–22.7 cm
- Height range
- 2.3–14.9 m
- R²
- 0.98
- 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 | 120 | 120 | Computed from the printed form computed from the published form at dbh = 20 cm, H = 15 m |
Related
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- Canadian national equation, grey birch, dbh only (stem wood plus stem bark; Table 3) · Lambert et al. 2005 · DBH
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