Tree Allometrics

Pinus brutia / Stem biomass

Pinus brutia stem biomass, Lebanon (Eq. 35)

Stem biomassPinus brutia · PinaceaeLebanonnaturalRead from the original paper
Photo of Pinus brutia
© Zeynel Cebeci · CC BY-SA · iNaturalist
Equation

As printed (Table 3, Lebanon, Eq. 35, p. 105)

y = e^(−1.372 + 8.1·d/(d + 25.96) + 0.92·ln h)

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

Stem biomass = exp(-1.372 + 8.1 * D / (D + 25.96) + 0.92 * ln(H))
D
Diameter at breast height (1.3 m), cm
H
Total tree height, m

Printed residual standard error 0.185 and variance function coefficient δ = 0.917 (model fitted on the original scale, so RSE is not a log-scale value and is not entered as fit.rse). Total aboveground biomass = stem + branches + needles (dry). DBH-only forms are those the authors recommend for tree- and forest-level predictions. Country-specific DBH and height ranges are not printed, so none are entered. Equations using crown length (19, 21) and the crown-biomass equations (23, 24, 33, 34, 43, 44) are not included.

Source
Lebanon (101 trees)
Trees measured · Section 2.1, p. 103
Trees measured
101
Method
nonlinear generalized least squares on the intrinsically linear form, power variance function (no back-transform correction)
Where
Lebanon (sparse, uneven-aged stands)
Last checked
2026-11-02
Calculate
Height from
16.3
Stem biomass (kg)
7.68
Carbon (kg), ×0.47
28.2
CO₂e (kg), ×44/12
050100150200250510152025303540DBH (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 = 10, H = 816.316.3Computed from the printed form
computed from the published form (coefficients as printed)
D = 25, H = 14153153Computed from the printed form
computed from the published form (coefficients as printed)
D = 45, H = 25834834Computed from the printed form
computed from the published form (coefficients as printed)

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