Abies alba / Aboveground biomass

Silver fir AGB, Bayesian, Dataset #2, D only

Aboveground biomassAbies alba · PinaceaeRomanianaturalRead from the original paper

Equation

As printed (Table 5, silver fir, Bayesian, Dataset #2, ln(D) (Equation 2; back-transformed as Equation 4))

ln(D): β0 = -2.3553, β1 = 2.3316, RSE = 0.4064, CF = 1.0861

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

Aboveground biomass = 1.0861 * exp(-2.3553 + 2.3316 * ln(D))

D: Diameter at breast height (1.3 m), cm

Fit on Dataset #2 (reduced site sample of 7 trees, Bayesian priors from generic data). 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).

Source

Dutcă, I., Zianis, D., Petrițan, I. C., Bragă, C. I., Ștefan, G., Yuste, J. C., & Petrițan, A. M. (2020). Allometric Biomass Models for European Beech and Silver Fir: Testing Approaches to Minimize the Demand for Site-Specific Biomass Observations. Forests, 11(11), 1136.

doi:10.3390/f11111136 · Open access · copy we read

smallest 7 trees for each of the two species

Trees measured · Section 2.1.2 (Dataset #2), p. 4

Trees measured: 7
DBH range: 6.3–27.9 cm
Residual SE: 0.4064
Correction factor: 1.0861 (applied)
Method: Bayesian log-log model with informative priors from the generic sample
Where: Șinca virgin forest, Romania
Last checked: 2026-11-02

Calculate

DBH (cm)

56.9

Aboveground biomass (kg)

26.7

Carbon (kg), ×0.47

98.1

CO₂e (kg), ×44/12

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%.

Inputs	Expected	We get	From
D = 15	56.9	56.9	Computed from the printed form computed from the published form (coefficients as printed)
D = 25	187	187	Computed from the printed form computed from the published form (coefficients as printed)

Report a problem with this equation · JSON

Silver fir AGB, Bayesian, Dataset #1, D only · Dutcă et al. 2020 · DBH
Silver fir AGB, Bayesian, Dataset #1, D and H · Dutcă et al. 2020 · DBH + Height
Silver fir AGB, Bayesian, Dataset #2, D and H · Dutcă et al. 2020 · DBH + Height
Silver fir AGB, LM, Dataset #1, D only · Dutcă et al. 2020 · DBH
Silver fir AGB, LM, Dataset #1, D and H · Dutcă et al. 2020 · DBH + Height
Silver fir AGB, RIM, Dataset #3, D only · Dutcă et al. 2020 · DBH
Silver fir AGB, RIM, Dataset #3, D and H · Dutcă et al. 2020 · DBH + Height
Silver fir AGB, RIM, Dataset #4, D only · Dutcă et al. 2020 · DBH
European beech AGB, Bayesian, Dataset #1, D only · same paper · Aboveground biomass
European beech AGB, Bayesian, Dataset #1, D and H · same paper · Aboveground biomass
European beech AGB, Bayesian, Dataset #2, D only · same paper · Aboveground biomass
European beech AGB, Bayesian, Dataset #2, D and H · same paper · Aboveground biomass
European beech AGB, LM, Dataset #1, D only · same paper · Aboveground biomass
European beech AGB, LM, Dataset #1, D and H · same paper · Aboveground biomass
European beech AGB, RIM, Dataset #3, D only · same paper · Aboveground biomass
European beech AGB, RIM, Dataset #3, D and H · same paper · Aboveground biomass

Compare these curves

Silver fir AGB, Bayesian, Dataset #2, D only

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