Vachellia tortilis combined leaf and twig biomass (Model 7)

Foliage biomassVachellia tortilisEthiopiaRead from the original paperPeer-reviewed sourceNot fully checked

Not fully checked: Table 1 gives M7 the same exponent on both diameters, whereas Table 5 and Fig. 6B give DBH exponent 2.073 and stump-diameter exponent −1.203. This record uses Table 5; confirm the conflicting model specification with the authors before relying on it.

Equation

As printed (Table 5, Models and Coefficients columns, Leaf and twig Model 7 row, p. 9)

Y = β₁ (d^β₂ dₛₕ^β₃); β₁ = 2.888, β₂ = 2.073, β₃ = −1.203

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

Foliage biomass = 2.888 * (D^2.073 * D30^(-1.203))

D: Diameter at breast height (1.3 m), cm
D30: Stem diameter at 30 cm, cm

Nonlinear power regression on the original scale; no back-transformation or correction is stated or applied. d is diameter at breast height, 1.3 m, and dsh is diameter at 30 cm above ground. For multi-stemmed trees use the square root of the sum of squared stem diameters at the relevant height (Eq. 1). The harvested stump-diameter range was 3.2–44.5 cm. This foliage component is the combined dry mass of leaves and twigs.

Source

Eshete, A., Getnet, D., Yilma, Z., Chimsa, D. & Befikadu, E. (2026). Aboveground biomass estimation of Vachellia tortilis (Forssk. Galasso & Banfi) for sustainable bioenergy production in the Central Rift Valley, Ethiopia. Discover Forests, 2, 49.

doi:10.1007/s44415-026-00110-y · Peer-reviewed · Open access · copy we read

Model 7 Y = β1 (d β2 dshβ3) 2.888 2.073* − 1.203 0.58 27.965 − 1.59 22.502 0.70 1

Equation · Table 5, Leaf and twig Model 7, p. 9

Leaf and twig

Output · Table 5, biomass component, p. 9

biomass (kg dry matter/

Units · Table 5 heading, p. 9

ith stem at stump or breast height (cm).

Units · Eq. 1 definition, p. 4

d: diameter at breast height (1.30 m); dsh:stump diameter at 30 cm height

Units · Table 5 note, p. 9

kg per plant, n: 15

Trees measured · Table 5 note, p. 9

Model 7 Y = β1 (d β2 dshβ3) 2.888 2.073* − 1.203 0.58 27.965 − 1.59 22.502 0.70 1

R² · Table 5, Leaf and twig Model 7, p. 9

non-linear power function

method · Abstract, p. 1

Vachellia tortilis

Taxon · Study area, p. 3

Adami Tullu Jido Kombolcha district

Where · Study area, p. 2

semi-arid climate zone

Where · Study area, p. 2

Trees measured: 15
R²: 0.58
Method: nonlinear power regression
Where: Adami Tullu Jido Kombolcha district, Central Rift Valley, Ethiopia
Last checked: 2026-11-05

Calculate

DBH (cm)D30 (cm)

21.6

Foliage biomass (kg)

10.1

Carbon (kg), ×0.47

37.1

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
D30 = 20, D = 15	21.6	21.6	Computed from the printed form Computed from the printed Table 5 coefficients; no individual published prediction with all inputs is provided.

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Vachellia tortilis combined leaf and twig biomass (Model 5) · Eshete et al. 2026 · DBH + Height
Vachellia tortilis combined leaf and twig biomass (Model 6) · Eshete et al. 2026 · D30 + Height
Vachellia tortilis total aboveground biomass (Model 2) · same paper · Aboveground biomass
Vachellia tortilis total aboveground biomass (Model 3) · same paper · Aboveground biomass
Vachellia tortilis total aboveground biomass (Model 4) · same paper · Aboveground biomass
Vachellia tortilis branch biomass (Model 3) · same paper · Branch biomass
Vachellia tortilis branch biomass (Model 4) · same paper · Branch biomass
Vachellia tortilis branch biomass (Model 5) · same paper · Branch biomass
Vachellia tortilis combined leaf and twig biomass (Model 5) · same paper · Foliage biomass
Vachellia tortilis combined leaf and twig biomass (Model 6) · same paper · Foliage biomass

Compare these curves

Vachellia tortilis combined leaf and twig biomass (Model 7)

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