Equations / Aboveground biomass

Willow (Salix spp.) aboveground biomass, northern taiga, Arkhangelsk

Aboveground biomassSalix · SalicaceaeRussianaturalRead from the original paper

Covers the whole genus

Equation

As printed (Eq. 1 and Table 2)

ln Pi = a0 + a1ln D (1); ln Pa –2,2814 2,3413 0,916 0,207 (coefficients a0, a1, adjR2, SE)

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

Aboveground biomass = exp(-2.2814 + 2.3413 * ln(D))

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

Model ln Pi = a0 + a1 ln D with natural log (stated as ln); biomass Pi in kg oven-dry, D at breast height in cm. The paper states no back-transformation correction factor, so none is applied. The SE printed in Table 2 is used as rse. The paper reports adjusted R2 only, so r2 is omitted. n = 52 sample trees taken from the 52 plots in Table 1. Stem biomass is stem with bark ('Ps').

Source

Paramonov, A. A., Usoltsev, V. A., Tretyakov, S. V., et al. (2022). Willow tree biomass and its allometric models in the conditions of the Arkhangelsk region. Forests of Russia and economy in them, 4(83), 10–19.

doi:10.51318/fret.2022.27.41.002 · Open access

Характеристика модельных деревьев ивы, взятых на 52 пробных площадях Архангельской области

Trees measured · Table 1 caption

Trees measured: 52
Residual SE: 0.207
Method: static allometry ln Pi = a0 + a1 ln D, regression fitted in Statgraphics-19
Where: Arkhangelsk region, northern taiga, Russia
Last checked: 2026-11-02

Calculate

DBH (cm)

4.42

Aboveground biomass (kg)

2.08

Carbon (kg), ×0.47

7.62

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	4.42	4.42	Computed from the printed form computed from the published form (coefficients as printed)
D = 8	13.3	13.3	Computed from the printed form computed from the published form (coefficients as printed)
D = 12	34.3	34.3	Computed from the printed form computed from the published form (coefficients as printed)

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Willow (Salix spp.) branch biomass, northern taiga, Arkhangelsk · same paper · Branch biomass
Willow (Salix spp.) foliage biomass, northern taiga, Arkhangelsk · same paper · Foliage biomass
Willow (Salix spp.) stem biomass with bark, northern taiga, Arkhangelsk · same paper · Stem biomass

Willow (Salix spp.) aboveground biomass, northern taiga, Arkhangelsk

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