Picea glauca / Stem biomass
Canadian national equation, white spruce, dbh only (stem wood plus stem bark; Table 3)
© Douglas Goldman · CC BY-SA · iNaturalistAs printed (Eq. 2)
In this library's units, ready to compute (kg)
Stem biomass = 0.0359 * D^2.5775 + 0.0116 * D^2.3022D- Diameter at breast height (1.3 m), cm
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 βbark2 + e bark
White spruce bwood1 0.0359
bwood2 2.5775
bbark1 0.0116
bbark2 2.3022
White spruce 832 16.6±0.3 12.9±0.2 123.6±5.7
(1.8;51.9) (1.1;37.5) (0.4;1344.6)
Stem 0.0003 0.94 35.2 4.81 0.0004 0.98 18.7 4.19
- Trees measured
- 832
- DBH range
- 1.8–51.9 cm
- R²
- 0.94
- Method
- Nonlinear seemingly unrelated regression with weight functions; additivity constrained so compartments sum to total
- Where
- Canada: Alberta, Manitoba, Newfoundland and Labrador, Nova Scotia, Northwest Territories, Ontario, Quebec, Saskatchewan, Yukon (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 | 92.5 | 92.5 | Computed from the printed form computed from the published form at dbh = 20 cm |
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