Ostrya virginiana / Aboveground biomass
Canadian national equation, hop-hornbeam, dbh and height (sum of wood, bark, branches, foliage; Table 4)
© Douglas Goldman · CC BY-SA · iNaturalistAs printed (Eq. 3)
In this library's units, ready to compute (kg)
Aboveground biomass = 0.0083 * D^1.6534 * H^1.7479 + 0.0012 * D^1.1486 * H^2.2903 + 0.0009 * D^1.9152 * H^1.7769 + 0.0247 * D^2.0056D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Total aboveground biomass = wood + bark + branches + foliage, each fitted as its own equation; the total is their sum (additivity by construction). 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
y bark = β bark1D βbark2Hβbark3 + e bark
y branches = β branches1D βbranches2Hβbranches3 + e branches
y foliage = β foliage1D βfoliage2Hβfoliage3 + efoliage
Hop-hornbeam bwood1 0.0083
bwood2 1.6534
bwood3 1.7479
bbark1 0.0012
bbark2 1.1486
bbark3 2.2903
bbranches1 0.0009
bbranches2 1.9152
bbranches3 1.7769
bfoliage1 0.0247
bfoliage2 2.0056
bfoliage3 —
Hop-hornbeam 14 7.7±0.9 8.6±0.4 20.0±6.4
(5.2;18.5) (6.3;11.9) (6.3;86.8)
Total 0.0679 0.92 6.9 2.73 15.6629 0.97 4.0 —
- Trees measured
- 14
- DBH range
- 5.2–18.5 cm
- Height range
- 6.3–11.9 m
- R²
- 0.97
- 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: DBH above the fitted 18.5 cm, height above the fitted 11.9 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 | 197 | 197 | Computed from the printed form computed from the published form at dbh = 20 cm, H = 15 m |
Related
- Canadian national equation, hop-hornbeam, dbh only (sum of wood, bark, branches, foliage; 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