Tree Allometrics

Populus balsamifera / Stem biomass

Populus balsamifera stem biomass, cross-sectional area at 0.3 m (NLS)

Stem biomassPopulus balsamifera · SalicaceaeCanadanaturalRead from the original paper
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Equation

As printed (Table 3, Eqs. 2-5)

Populus balsamifera Stems NLS 47.3512 1.3235 0.924 (columns: β, SE(β), α, SE(α), RMSE, R2); y = βx^α + ε (Eq. 2)

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

Stem biomass = 47.3512 * (0.785398163397448 * D30^2)^1.3235 / 1000
D30
Stem diameter at 30 cm, cm

Paper's predictor is cross-sectional area (cm2) of the stem(s) at 0.3 m; converted here to D30 as pi/4 * D30^2 (pi written as 0.785398163397448 * ...), so for multi-stemmed trees D30 is the equivalent diameter of the summed cross-sectional area. Paper output is in g dry mass; canonical form divides by 1000. Fit range of the predictor is not stated, so none is given.

Source
Populus balsamifera 31
Trees measured · Table 1, No. of Samples
Trees measured
31
R²
0.924
Method
iterative nonlinear least squares power function, y = β x^α (unweighted), x = cross-sectional area
Where
Sporadic to discontinuous permafrost zone, Taiga Plains and Taiga Shield ecozones, northwestern Canada
Last checked
2026-11-02
Calculate
0.215
Stem biomass (kg)
0.101
Carbon (kg), ×0.47
0.371
CO₂e (kg), ×44/12
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
D30 = 20.2150.215Computed from the printed form
computed from the published form (coefficients as printed)
D30 = 52.442.44Computed from the printed form
computed from the published form (coefficients as printed)
D30 = 88.458.45Computed from the printed form
computed from the published form (coefficients as printed)

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