Equations / Root biomass

Sambucus racemosa, belowground dry mass vs base diameter (Model 1)

Root biomassSambucus racemosa · SambucaceaeRussianaturalRead from the original paper

Equation

As printed (Eq. (1)/(2) and Table 2 (p. 10-11))

lnPbg = a0 + a1lnD0; Sambucus racemosa: a0 = -3,075, a1 = 3,786, BaskCF = 2,32

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

Root biomass = 2.32 * exp(-3.075 + 3.786 * ln(DRC))

DRC: Root collar / stem base diameter, cm

Understory plant (small tree/shrub) under Scots pine. Output in kg: the text states kg for P; Table 1 headings say g, but the kg reading matches the ranges in Table 1 (e.g. Sambucus Pag max 943 g = 0.943 kg). Predictor is base diameter D0 (root collar), mapped to canonical DRC. n=7 (<10): authors treat as preliminary. Best-supported species in the paper (Q2CV 0.53-0.86).

Source

Kartashova, N.P., Sheshnitsan, S.S., Tsaregorodtsev, A.V. (2026). Allometric models of biomass of understory trees and shrubs in pine stands of Voronezh Oblast. Forestry Engineering Journal (Lesotekhnicheskii zhurnal), 16(3), 6–19.

doi:10.34220/issn.2222-7962/2026.3/1 · Open access · copy we read

Sambucus racemosa n = 7

Trees measured · Table 1, p. 9

Trees measured: 7
R²: 0.814
Correction factor: 2.32 (applied)
Method: log-log regression (OLS on natural logs), Baskerville correction factor
Where: Prigorodnoye Forestry, Levoberezhnoe District Forestry, Voronezh Oblast (pine stands, forest-steppe)
Last checked: 2026-11-01

Calculate

Root collar diameter (cm)

0.008

Root biomass (kg)

0.004

Carbon (kg), ×0.47

0.013

CO₂e (kg), ×44/12

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
DRC = 0.5	0.00777	0.00777	Computed from the printed form hand-computed from the published form (Table 2 coefficients, Baskerville factor BaskCF applied)
DRC = 1	0.107	0.107	Computed from the printed form hand-computed from the published form (Table 2 coefficients, Baskerville factor BaskCF applied)
DRC = 1.5	0.497	0.497	Computed from the printed form hand-computed from the published form (Table 2 coefficients, Baskerville factor BaskCF applied)

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Sambucus racemosa, belowground dry mass vs base diameter (Model 1)

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