Tree Allometrics

Equations / Stem biomass

Populus x euramericana stem with bark biomass (Table 2)

Stem biomassPopulus x euramericana · SalicaceaeSpainmixedRead from the original paper
Photo of Populus x euramericana
© Andre Hosper · CC BY · iNaturalist
Equation

As printed (Table 2, Populus x euramericana, Stem row)

Ws = 0.0130 · d² · h

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

Stem biomass = 0.0130 * D^2 * H
D
Diameter at breast height (1.3 m), cm
H
Total tree height, m

Stem with bark (commercial volume, up to a top diameter of 7 cm); fitted jointly with the branch equations by SUR to keep components additive. Stand type is not stated per species in the paper. Branch equations for this species are not added.

Source
Populus x euramericana ... 32
Trees measured · Table 1, Populus x euramericana row, aboveground biomass n column
Populus x euramericana 11.4 50.7
Smallest DBH · Table 1, diameter min/max (all sample trees of the species)
Trees measured
32
DBH range
11.4–50.7 cm
Height range
9.6–31.1 m
Method
seemingly unrelated regression with weighting
Where
Spain (sample zones per species, Figure 1)
Last checked
2026-11-02
Calculate
Height from
52
Stem biomass (kg)
24.44
Carbon (kg), ×0.47
89.61
CO₂e (kg), ×44/12
Fitted DBH range050100150200250510152025303540DBH (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 = 20, H = 105252Computed from the printed form
computed from the Table 2 coefficients
D = 35, H = 15238.9238.9Computed from the printed form
computed from the Table 2 coefficients

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