Tree Allometrics

Equations / Branch biomass

Pinus douglasiana and Pinus michoacana branch biomass (wood and bark)

Branch biomassPinus douglasiana and Pinus michoacana (data combined) · PinaceaeMexiconaturalRead from the original paper
Many species, no single photo
Equation

As printed (Table 2, p. 12)

0.014982d2.40887

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

Branch biomass = 0.014982 * D^2.40887
D
Diameter at breast height (1.3 m), cm

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. Data of the two species were combined by the authors; fit ranges not printed for the combined set.

Source
branches (including both wood and bark)
Output · Section 2.2
R2 0.90 (cross-validation)
R² · Table 2, p. 12
R²
0.9
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
20.4
Branch biomass (kg)
9.587
Carbon (kg), ×0.47
35.15
CO₂e (kg), ×44/12
020406080100120510152025303540DBH (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 = 2020.420.4Computed from the printed form
computed from the Table 2 equation
D = 3578.578.5Computed from the printed form
computed from the Table 2 equation

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