Tree Allometrics

Quercus obtusata / Stem biomass

Quercus obtusata: stem biomass

Stem biomassQuercus obtusata Bonpl. · FagaceaeMexiconaturalRead from the original paper
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Equation

As printed (Table 9, Quercus obtusata)

Bf = exp (– 3.53684) × Dn^2.043763 × At^0.759522

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

Stem biomass = exp(-3.53684) * D^2.043763 * H^0.759522
D
Diameter at breast height (1.3 m), cm
H
Total tree height, m

Table 1 sample size and ranges for this species. Adjusted R2 (not stored): stem 0.86, branches 0.84, foliage 0.82, total 0.94 (Table 9).

Source
34
Trees measured · Table 1, Q. obtusata
Trees measured
34
DBH range
6.2–37.6 cm
Height range
4.85–14.2 m
Method
Additive system of component equations fitted simultaneously (iterated seemingly unrelated regression)
Where
Sierra de Santa Rosa, Guanajuato (bosques de encino)
Last checked
2026-11-02
Calculate
Height from
37.6
Stem biomass (kg)
17.7
Carbon (kg), ×0.47
64.9
CO₂e (kg), ×44/12
Fitted DBH range050100150200250300510152025303540DBH (cm)Stem biomass (kg)Stem 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 = 15.6, H = 7.737.637.6Computed from the printed form
computed from the published form (Table 9)
D = 28.2, H = 11.4170170Computed from the printed form
computed from the published form (Table 9)

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