Tree Allometrics

Fagus sylvatica / Aboveground biomass

European beech AGB, RIM, Dataset #4, D only

Aboveground biomassFagus sylvatica · FagaceaeRomanianaturalRead from the original paper
Photo of Fagus sylvatica
© Rebecca Gimenez Husted · CC BY · iNaturalist
Equation

As printed (Table 5, European beech, RIM, Dataset #4, ln(D) (Equation 2; back-transformed as Equation 4))

ln(D): β0 = -2.1625, β1 = 2.4368, RSE = 0.1683, CF = 1.0143

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

Aboveground biomass = 1.0143 * exp(-2.1625 + 2.4368 * ln(D))
D
Diameter at breast height (1.3 m), cm

Fit on Dataset #4 (generic + reduced site sample of 7 trees). Whole-tree dry AGB including foliage (stem and branches with leaves/needles weighed and dried). Equation form AGB = exp(β0)·D^β1·(H^β2)·CF with CF = exp(σ²/2) printed in Table 5 and applied here. D in cm, H in m, output kg (units not restated beside Table 5; stated in Table 1 for D, H, AGB). For RIM models the parameters printed are those retained for the Șinca site. Fit ranges are those of Dataset #4 (Table 4: generic trees plus the 7 smallest site trees).

Source
D range (cm) 5.2–62.1
Smallest DBH · Table 4, Dataset #4, European beech
151 (i.e., 144 + 7) / 109 (i.e., 102 + 7)
Trees measured · Table 4, sample size
Trees measured
151
DBH range
5.2–62.1 cm
Residual SE
0.1683
Correction factor
1.0143 (applied)
Method
random intercept mixed model on log-log data (generic plus site-specific trees); estimates for the Șinca site
Where
Șinca virgin forest, Romania
Last checked
2026-11-02
Calculate
173
Aboveground biomass (kg)
81.2
Carbon (kg), ×0.47
298
CO₂e (kg), ×44/12
Fitted DBH range02004006008001,000510152025303540DBH (cm)Aboveground biomass (kg)Aboveground 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 = 20173173Computed from the printed form
computed from the published form (coefficients as printed)
D = 501,6111,611Computed from the printed form
computed from the published form (coefficients as printed)

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