Vachellia tortilis / Aboveground biomass

Vachellia tortilis total aboveground biomass (Model 2)

Aboveground biomassVachellia tortilisEthiopiaRead from the original paperPeer-reviewed source

Equation

As printed (Table 5, Models and Coefficients columns, Total Model 2 row, p. 9)

Y = β₁dₛₕ^β₂; β₁ = 0.734, β₂ = 1.854

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

Aboveground biomass = 0.734 * D30^1.854

D30: Stem diameter at 30 cm, cm

Nonlinear power regression on the original scale; no back-transformation or correction is stated or applied. dsh is diameter at 30 cm above ground. For multi-stemmed trees use the square root of the sum of squared stem diameters at that height (Eq. 1). The harvested stump-diameter range was 3.2–44.5 cm. The authors recommend M2 for rapid field inventories.

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 2 Y = β1dshβ2 0.734 1.854*** 0.95 63.45 − 6.026 36.83 0.79 2

Equation · Table 5, Total Model 2, p. 9

Total

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

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 2 Y = β1dshβ2 0.734 1.854*** 0.95 63.45 − 6.026 36.83 0.79 2

R² · Table 5, Total Model 2, 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: 0.95
Method: nonlinear power regression
Where: Adami Tullu Jido Kombolcha district, Central Rift Valley, Ethiopia
Last checked: 2026-11-05

Calculate

D30 (cm)

190

Aboveground biomass (kg)

89.1

Carbon (kg), ×0.47

327

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
D30 = 20	190	190	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 7) · same paper · Foliage biomass

Compare these curves

Vachellia tortilis total aboveground biomass (Model 2)

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