Tree Allometrics

Equations / Foliage biomass

Arbutus bicolor foliage biomass

Foliage 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)

0.00698d1.50325h0.84794

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

Foliage biomass = 0.00698 * D^1.50325 * H^0.84794
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
foliage (needles/leaves)
Output · Section 2.2
R2 0.79 (cross-validation)
R² · Table 2, p. 12
(49)
Trees measured · Table 1
Trees measured
49
DBH range
7.9–44.8 cm
R²
0.79
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
5.185
Foliage biomass (kg)
2.437
Carbon (kg), ×0.47
8.935
CO₂e (kg), ×44/12
Fitted DBH range0246810121416510152025303540DBH (cm)Foliage biomass (kg)Foliage 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 = 125.185.18Computed from the printed form
computed from the Table 2 equation
D = 35, H = 181717Computed from the printed form
computed from the Table 2 equation

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