Tree Allometrics

Vachellia tortilis / Aboveground biomass

Vachellia tortilis total aboveground biomass (Model 3)

Aboveground biomassVachellia tortilisEthiopiaRead from the original paperPeer-reviewed source
Photo of Vachellia tortilis
© Rabah Al-Shammary · CC BY · iNaturalist
Equation

As printed (Table 5, Models and Coefficients columns, Total Model 3 row, p. 9)

Y = β₁d^β₂h^β₃; β₁ = 0.79, β₂ = 1.757, β₃ = 0.233

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

Aboveground biomass = 0.79 * D^1.757 * H^0.233
D
Diameter at breast height (1.3 m), cm
H
Total tree height, m

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 h is total height. 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.

Source
Model 3 Y = β1d β2h β3 0.79 1.757*** 0.233 0.95 49.93 − 0.786 39.979 0.87 3
Equation · Table 5, Total Model 3, 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
d: diameter at breast height (1.30 m); dsh:stump diameter at 30 cm height; h: total
Units · Table 5 note, p. 9
height of plant (m)
Units · Table 5 note, p. 9
kg per plant, n: 15
Trees measured · Table 5 note, p. 9
Model 3 Y = β1d β2h β3 0.79 1.757*** 0.233 0.95 49.93 − 0.786 39.979 0.87 3
R² · Table 5, Total Model 3, 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
Height from
119
Aboveground biomass (kg)
55.9
Carbon (kg), ×0.47
205
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%.

InputsExpectedWe getFrom
D = 15, H = 3119119Computed from the printed form
Computed from the printed Table 5 coefficients; no individual published prediction with all inputs is provided.

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