Equations / Stem biomass
Canadian national equation, hickory, dbh and height (stem wood plus stem bark; Table 4)
As printed (Eq. 3)
In this library's units, ready to compute (kg)
Stem biomass = 0.0139 * D^1.5913 * H^1.508 + 0.0081 * D^1.4943 * H^1.1324D- 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. The paper names this taxon only as 'Hickory' (Carya Nutt.), so it is a genus record. 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
Hickory bwood1 0.0139
bwood2 1.5913
bwood3 1.5080
bbark1 0.0081
bbark2 1.4943
bbark3 1.1324
Hickory 76 20.8±1.2 19.3±0.8 363.3±42.4
(2.8;46.6) (3.9;29.4) (1.4;1335.1)
Stem 1.9675 0.88 83.7 2.42 0.0058 0.97 38.0 3.81
Hickory Caryer Carya Nutt.
- Trees measured
- 76
- DBH range
- 2.8–46.6 cm
- Height range
- 3.9–29.4 m
- R²
- 0.97
- Method
- Nonlinear seemingly unrelated regression with weight functions; additivity constrained so compartments sum to total
- Where
- Ontario and Quebec, 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, H = 15 | 112 | 112 | Computed from the printed form computed from the published form at dbh = 20 cm, H = 15 m |
Related
- Canadian national equation, hickory, 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