Tree Allometrics

Arbutus bicolor / Branch biomass

Arbutus bicolor branch biomass (wood and bark)

Branch biomassArbutus bicolor · EricaceaeMexiconaturalRead from the original paper
Photo of Arbutus bicolor
© M. Socorro González Elizondo · CC BY-SA · iNaturalist
Equation

As printed (Table 2, p. 12)

0.02125d1.81216h0.8198

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

Branch biomass = 0.02125 * D^1.81216 * H^0.8198
D
Diameter at breast height (1.3 m), cm
H
Total tree height, m

Equation as printed in the Table 2 system for this taxon; d is DBH in cm, h total height in m, output in kg dry mass. R² is the 10-fold cross-validation value. Table 1 prints a maximum height of 2.5 m against a mean of 8.9 m for this species, which is inconsistent, so the height range is left out.

Source
branches (including both wood and bark)
Output · Section 2.2
R2 0.95 (cross-validation)
R² · Table 2, p. 12
(49)
Trees measured · Table 1
Trees measured
49
DBH range
7.9–44.8 cm
R²
0.95
Method
Power-law component equations fitted simultaneously by generalized method of moments (additive system)
Where
Durango, Sierra Madre Occidental
Last checked
2026-11-02
Calculate
Height from
37.1
Branch biomass (kg)
17.5
Carbon (kg), ×0.47
64
CO₂e (kg), ×44/12
Fitted DBH range020406080100120140510152025303540DBH (cm)Branch biomass (kg)Branch biomass

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%.

InputsExpectedWe getFrom
D = 20, H = 1237.137.1Computed from the printed form
computed from the Table 2 equation
D = 35, H = 18143143Computed from the printed form
computed from the Table 2 equation

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