Tsuga canadensis / Aboveground biomass

North American taxa group: Tsuga < 0.40 spg (Table 5)

Aboveground biomassTsuga canadensis · PinaceaeUnited StatesmixedRead from the original paper

Equation

As printed (Table 5 caption, p. 140)

ln(biomass) = β0 + β1 ln(diameter)

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

Aboveground biomass = exp(-2.348 + 2.3876 * ln(D))

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

Fitted for the Tsuga < 0.40 spg taxon, which held only eastern hemlock equations, so it is recorded as a species fit. Median specific gravity of the group: 0.38. Diameter range is that of the pseudodata. R² is the published 'R²-statistic'.

Source

Chojnacky, D.C., Heath, L.S., Jenkins, J.C. (2014). Updated generalized biomass equations for North American tree species. Forestry, 87(1), 129–151.

doi:10.1093/forestry/cpt053 · Open access · copy we read

Tsuga < 0.40 spg 0.38 −2.3480 2.3876 65 9 dbh 3–85 0.85

Equation · Table 5 row, p. 140

Tsuga canadensis Hemlock, eastern 261 0.38 9

Taxon · Table 2, p. 135

we did not include a correction (Baskerville, 1972) for underestimation

Correction factor · Methods, p. 139

DBH range: 3–85 cm
R²: 0.85
Method: Weighted regression of ln(biomass) on ln(dbh) fitted to 65 pseudodata points generated from 9 published equations; no back-transform correction
Where: United States (equations compiled from US and Canadian studies)
Last checked: 2026-11-03

Calculate

DBH (cm)

321

Aboveground biomass (kg)

151

Carbon (kg), ×0.47

554

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 = 30	321	321	Computed from the printed form computed from the published form at dbh = 30 cm

Report a problem with this equation · JSON

North American taxa group: Tsuga ≥ 0.40 spg (Table 5) · Chojnacky et al. 2014 · DBH
Canadian national equation, eastern hemlock, dbh and height (sum of wood, bark, branches, foliage; Table 4) · Lambert et al. 2005 · DBH + Height
Canadian national equation, eastern hemlock, dbh only (sum of wood, bark, branches, foliage; Table 3) · Lambert et al. 2005 · DBH
Western hemlock total aboveground biomass from DBH and height (Table 4) · Poudel et al. 2019 · DBH + Height
Mountain hemlock total aboveground biomass from DBH (Table 4) · Poudel et al. 2019 · DBH
NSVB eastern hemlock, Warm Continental Division (210): total aboveground biomass (without foliage), segmented model (Eq. 2), D ≥ 9 in (22.86 cm) · Westfall et al. 2024 · DBH + Height
NSVB eastern hemlock, Warm Continental Division (210): total aboveground biomass (without foliage), segmented model (Eq. 2), D < 9 in (22.86 cm) · Westfall et al. 2024 · DBH + Height
NSVB eastern hemlock, species-level (all ecodivisions): total aboveground biomass (without foliage), segmented model (Eq. 2), D ≥ 9 in (22.86 cm) · Westfall et al. 2024 · DBH + Height
North American taxa group: Abies ≥ 0.35 spg (Table 5) · same paper · Aboveground biomass
North American taxa group: Abies < 0.35 spg (Table 5) · same paper · Aboveground biomass
North American taxa group: Aceraceae ≥ 0.50 spg (Table 5) · same paper · Aboveground biomass
North American taxa group: Aceraceae < 0.50 spg (Table 5) · same paper · Aboveground biomass
North American taxa group: Betulaceae 0.40–0.49 spg (Table 5) · same paper · Aboveground biomass
North American taxa group: Betulaceae 0.50–0.59 spg (Table 5) · same paper · Aboveground biomass
North American taxa group: Betulaceae ≥ 0.60 spg (Table 5) · same paper · Aboveground biomass
North American taxa group: Betulaceae < 0.40 spg (Table 5) · same paper · Aboveground biomass

Compare these curves

North American taxa group: Tsuga < 0.40 spg (Table 5)

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