Alnus incana / Branch biomass

Gray alder, Arkhangelsk: branch biomass from D (Table 2)

Branch biomassAlnus incana · BetulaceaeRussiamixedRead from the original paper

Equation

As printed (Table 2, ln Pb row)

ln Pb (1) –4,4668 2,4038 – – 0,729 0,469 50 (ln Pi = a0 + a1 ln D)

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

Branch biomass = exp(-4.4668 + 2.4038 * ln(D))

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

The note to Table 2 says the free term includes the correction for logarithmic transformation (Baskerville 1972), so no separate factor is applied. Natural log (ln) as printed. The paper reports adjusted R2 (not R2); adjR2 = 0.729. Stand origin not stated (pure stands or with admixture of other species). DBH range is the min and max of column D in Table 1 over the 50 trees.

Source

Karaban, A. A., Usoltsev, V. A., Tretyakov, S. V., Koptev, S. V., Paramonov, A. A., Tsvetkov, I. V., Davydov, A. V., & Tsepordey, I. S. (2023). Biomass of gray alder trees and its allometric models in the conditions of the Arkhangelsk region. Forests of Russia and economy in them, 2(85), 42–50.

doi:10.51318/fret.2023.36.20.005 · Open access · copy we read

Полная характеристика полученных данных о 50 модельных деревьях ольхи серой дана в табл. 1.

Trees measured · Methods, p. 44

25 20 3,6 5,10 12,22 6,48 0,004 0,001 2,596 0,121 0,230 0,049 2,875 4,250

Smallest DBH · Table 1, tree No. 25 (smallest D, 3.6 cm); largest D is tree No. 15, 16.9 cm

Trees measured: 50
DBH range: 3.6–16.9 cm
Residual SE: 0.469
Method: OLS regression on natural logarithms; free term corrected for log transformation (Baskerville 1972)
Where: Arkhangelsk region, northern taiga (Primorsky, Krasnoborsky and Kargopolsky districts)
Last checked: 2026-11-02

Calculate

DBH (cm)

0.55

Branch biomass (kg)

0.258

Carbon (kg), ×0.47

0.948

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 = 5	0.55	0.55	Computed from the printed form computed from the published form (coefficients as printed; free term already includes the Baskerville log correction per the Table 2 note)
D = 10	2.91	2.91	Computed from the printed form computed from the published form (coefficients as printed; free term already includes the Baskerville log correction per the Table 2 note)
D = 15	7.71	7.71	Computed from the printed form computed from the published form (coefficients as printed; free term already includes the Baskerville log correction per the Table 2 note)

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Grey alder branches dry mass from DBH (general equation) · Tretyakov et al. 2022 · DBH
Gray alder, European Russia pooled: aboveground biomass from D (Eq. 5) · same paper · Aboveground biomass
Gray alder, Arkhangelsk: aboveground biomass from D (Table 2) · same paper · Aboveground biomass
Gray alder, southern taiga and mixed-forest data (Kazimirov 1978, Miezīte 2011): root biomass from D and aboveground biomass (Table 2) · same paper · Root biomass
Gray alder, Arkhangelsk: foliage biomass from D (Table 2) · same paper · Foliage biomass
Gray alder, Arkhangelsk: stem biomass (in bark) from D (Table 2) · same paper · Stem biomass

Compare these curves

Gray alder, Arkhangelsk: branch biomass from D (Table 2)

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