Tsuga canadensis / Foliage biomass
Canadian national equation, eastern hemlock, dbh only (foliage; Table 3)
© Ian Manning · CC BY · iNaturalistAs printed (Eq. 2)
In this library's units, ready to compute (kg)
Foliage biomass = 0.0776 * D^1.6995D- Diameter at breast height (1.3 m), cm
Foliage is leaves and twigs. 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
bfoliage1 0.0776
bfoliage2 1.6995
Eastern hemlock 235 24.1±0.9 14.4±0.4 286.9±20.5
(1.3;51.4) (2.3;26.5) (0.6;1406.6)
Foliage 0.0010 0.77 10.7 3.43 0.0008 0.74 11.4 3.53
- Trees measured
- 235
- DBH range
- 1.3–51.4 cm
- R²
- 0.77
- 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 | 12.6 | 12.6 | Computed from the printed form computed from the published form at dbh = 20 cm |
Related
- Canadian national equation, eastern hemlock, dbh and height (foliage; Table 4) · Lambert et al. 2005 · DBH + Height
- NSVB eastern hemlock, Warm Continental Division (210): foliage biomass, Schumacher-Hall model (Eq. 1) · Westfall et al. 2024 · DBH + Height
- NSVB eastern hemlock, species-level (all ecodivisions): foliage biomass, Schumacher-Hall model (Eq. 1) · Westfall et al. 2024 · DBH + Height
- NSVB eastern hemlock, Hot Continental Regime Mountains (M220): foliage biomass, Schumacher-Hall model (Eq. 1) · Westfall et al. 2024 · DBH + Height
- NSVB western hemlock, species-level (all ecodivisions): foliage biomass, Schumacher-Hall model (Eq. 1) · Westfall et al. 2024 · DBH + Height
- 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