Ostrya virginiana / Branch biomass

Canadian national equation, hop-hornbeam, dbh and height (branches; Table 4)

Branch biomassOstrya virginiana · BetulaceaeCanadaRead from the original paper

Equation

As printed (Eq. 3)

y branches = β branches1D βbranches2Hβbranches3 + e branches

In this library's units, ready to compute (kg)

Branch biomass = 0.0009 * D^1.9152 * H^1.7769

D: Diameter at breast height (1.3 m), cm
H: Total tree height, m

All branches, cut at the stem base (live branches; dead branches excluded). 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.

Source

Lambert, M.-C., Ung, C.-H., Raulier, F. (2005). Canadian national tree aboveground biomass equations. Canadian Journal of Forest Research, 35(8), 1996–2018.

doi:10.1139/x05-112 · Paywalled · copy we read

bbranches1 0.0009

Equation · Table 4, Hop-hornbeam

bbranches2 1.9152

Equation · Table 4, Hop-hornbeam

bbranches3 1.7769

Equation · Table 4, Hop-hornbeam

Hop-hornbeam 14 7.7±0.9 8.6±0.4 20.0±6.4

Trees measured · Table 2 (No. of trees)

(5.2;18.5) (6.3;11.9) (6.3;86.8)

Smallest DBH · Table 2, Hop-hornbeam (ranges of dbh, height, total biomass)

Branches 1.2060 0.92 1.1 — 0.5735 0.96 0.8 —

R² · Table 5, Hop-hornbeam (AdjRSq in the dbh- and height-based set, second block)

Trees measured: 14
DBH range: 5.2–18.5 cm
Height range: 6.3–11.9 m
R²: 0.96
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

Calculate

DBH (cm)Height (m)

Height from

34.3

Branch biomass (kg)

16.1

Carbon (kg), ×0.47

59.2

CO₂e (kg), ×44/12

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.

Checks this equation passes

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	34.3	34.3	Computed from the printed form computed from the published form at dbh = 20 cm, H = 15 m

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Canadian national equation, hop-hornbeam, dbh only (branches; 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

Compare these curves

Canadian national equation, hop-hornbeam, dbh and height (branches; Table 4)

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