Picea rubens / Foliage biomass

Canadian national equation, red spruce, dbh only (foliage; Table 3)

Foliage biomassPicea rubens · PinaceaeCanadaRead from the original paper

Equation

As printed (Eq. 2)

y foliage = β foliage1D βfoliage2 + efoliage

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

Foliage biomass = 0.0066 * D^2.4213

D: 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.

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

bfoliage1 0.0066

Equation · Table 3, Red spruce

bfoliage2 2.4213

Equation · Table 3, Red spruce

Red spruce 55 22.9±1.2 15.9±0.4 207.7±22.4

Trees measured · Table 2 (No. of trees)

(6.5;43.5) (8.0;21.2) (9.1;811.7)

Smallest DBH · Table 2, Red spruce (ranges of dbh, height, total biomass)

Foliage 0.0005 0.90 4.2 3.25 0.0002 0.89 4.3 3.53

R² · Table 5, Red spruce (AdjRSq in the dbh-based set, first block)

Trees measured: 55
DBH range: 6.5–43.5 cm
R²: 0.9
Method: Nonlinear seemingly unrelated regression with weight functions; additivity constrained so compartments sum to total
Where: Quebec, Canada (ENFOR archival data, early 1980s)
Last checked: 2026-11-03

Calculate

DBH (cm)

9.33

Foliage biomass (kg)

4.38

Carbon (kg), ×0.47

16.1

CO₂e (kg), ×44/12

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	9.33	9.33	Computed from the printed form computed from the published form at dbh = 20 cm

Report a problem with this equation · JSON

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Picea spp. leaf biomass, cross-sectional area at 0.3 m (LLRC) · Flade et al. 2021 · D30
Picea spp. leaf biomass, cross-sectional area at 0.3 m (NLS) · Flade et al. 2021 · D30
Canadian national equation, black spruce, dbh and height (foliage; Table 4) · Lambert et al. 2005 · DBH + Height
Canadian national equation, black spruce, dbh only (foliage; Table 3) · Lambert et al. 2005 · DBH
Canadian national equation, red spruce, dbh and height (foliage; Table 4) · Lambert et al. 2005 · DBH
Canadian national equation, white spruce, dbh and height (foliage; Table 4) · Lambert et al. 2005 · 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

Compare these curves

Canadian national equation, red spruce, dbh only (foliage; Table 3)

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