Juniperus virginiana / Stem biomass
Canadian national equation, eastern redcedar, dbh and height (stem wood plus stem bark; Table 4)
© Douglas Goldman · CC BY-SA · iNaturalistAs printed (Eq. 3)
In this library's units, ready to compute (kg)
Stem biomass = 0.052 * D^1.7731 * H^0.7054 + 0.0283 * D^1.7079D- 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. Height drops out of the bark 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
y bark = β bark1D βbark2Hβbark3 + e bark
Eastern redcedar bwood1 0.0520
bwood2 1.7731
bwood3 0.7054
bbark1 0.0283
bbark2 1.7079
bbark3 —
Eastern redcedar 33 12.3±1.4 7.2±0.4 52.7±12.3
(2.0;38.2) (2.7;12.8) (1.4;316.4)
Stem 0.4967 0.96 7.4 1.76 0.1072 0.98 5.3 2.15
- Trees measured
- 33
- DBH range
- 2–38.2 cm
- Height range
- 2.7–12.8 m
- R²
- 0.98
- Method
- Nonlinear seemingly unrelated regression with weight functions; additivity constrained so compartments sum to total
- Where
- Ontario, Canada (ENFOR archival data, early 1980s)
- Last checked
- 2026-11-03
Outside the data this model was fitted on: height above the fitted 12.8 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 | 75.9 | 75.9 | Computed from the printed form computed from the published form at dbh = 20 cm, H = 15 m |
Related
- Canadian national equation, eastern redcedar, dbh only (stem wood plus stem bark; Table 3) · Lambert et al. 2005 · DBH
- Canadian national equation, alpine fir, dbh only (branches; Table 3) · same paper · Branch biomass
- Canadian national equation, alpine fir, dbh and height (branches; Table 4) · same paper · Branch biomass
- Canadian national equation, alpine fir, dbh and height (foliage; Table 4) · same paper · Foliage biomass
- Canadian national equation, alpine fir, dbh and height (stem wood plus stem bark; Table 4) · same paper · Stem biomass
- Canadian national equation, alpine fir, dbh and height (sum of wood, bark, branches, foliage; Table 4) · same paper · Aboveground biomass
- Canadian national equation, alpine fir, dbh only (foliage; Table 3) · same paper · Foliage biomass
- Canadian national equation, alpine fir, dbh only (stem wood plus stem bark; Table 3) · same paper · Stem biomass
- Canadian national equation, alpine fir, dbh only (sum of wood, bark, branches, foliage; Table 3) · same paper · Aboveground biomass