Tree Allometrics

Equations / Aboveground biomass

North American taxa group: woodland Cupressaceae (Table 5)

Aboveground biomassWoodland Cupressaceae (Cupressus spp., Juniperus monosperma, J. occidentalis, J. osteosperma) · CupressaceaeUnited StatesmixedRead from the original paper

Fitted on these 3 species and others the paper does not name here: Juniperus monosperma, Juniperus occidentalis, Juniperus osteosperma

3 of the 3 species it was fitted on · iNaturalist photos, hover for credit
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(-2.7096 + 2.1942 * ln(DRC))
DRC
Root collar / stem base diameter, cm

Woodland junipers and pygmy cypress, by root-collar diameter. The authors say it 'seemed to predict low' and give a refit (chojnacky-2014-woodland-juniper-refit). Root-collar diameter range of the pseudodata: 4–87 cm. Median specific gravity of the group: 0.50. R² is the published 'R²-statistic'.

Source
Cupressaceae2 0.50 −2.7096 2.1942 57 6 drc 4–87 0.91
Equation · Table 5 row, p. 140
Cupressaceae J. osteosperma Juniper, Utah 65 0.54 3
Taxon · Table 4, p. 138
we did not include a correction (Baskerville, 1972) for underestimation
Correction factor · Methods, p. 139
R²
0.91
Method
Weighted regression of ln(biomass) on ln(drc) fitted to 57 pseudodata points generated from 6 published equations; no back-transform correction
Where
United States (equations compiled from US and Canadian studies)
Last checked
2026-11-03
Calculate
116
Aboveground biomass (kg)
54.5
Carbon (kg), ×0.47
200
CO₂e (kg), ×44/12
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%.

InputsExpectedWe getFrom
DRC = 30116116Computed from the printed form
computed from the published form at drc = 30 cm

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