Tree Allometrics

Syzygium guineense / Aboveground biomass, without leaves

Syzygium guineense aboveground biomass, M2

Aboveground biomass, without leavesSyzygium guineenseEthiopiaRead from the original paperPeer-reviewed sourceNot fully checked

Not fully checked: Foliage coverage is inconsistent: §2.3 (p. 54) sums stump, stem and branches, whereas §2.5 says leaves were determined when measuring total aboveground biomass. This record follows the explicit dry-mass sum and excludes foliage; confirm foliage coverage before treating the prediction as complete aboveground biomass or adding a separate foliage estimate.

Photo of Syzygium guineense
© Tony Rebelo · CC BY-SA · iNaturalist
Equation

As printed (Methods §2.6, p. 54 (PDF p. 4))

ln(B) = ln(β0) + β1ln(DBH) + β2ln(H) + Ɛ M2

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

Aboveground biomass, without leaves = exp(-4.122 + 1.051 * ln(D) + 2.664 * ln(H)) * 1.013
D
Diameter at breast height (1.3 m), cm
H
Total tree height, m

The table coefficient is back-transformed and multiplied once by the printed correction factor. DBH is measured at 1.3 m; H is total tree height. Table 1 describes R² as adjusted. The authors recommend the height-integrated M2 for this species. Table 1 spells the genus Syzigium; the text uses Syzygium. The paper does not describe a held-out validation subset.

Source
-4.122(0.191)*** 1.051(0.122)*** 2.664(0.196)***
Equation · Table 1, Syzigium guineense row, pp. 56–57 (PDF pp. 6–7)
unit values and multiplied by the correction factor.
Equation · Methods §2.7, p. 55 (PDF p. 5)
total dry weight of a tree was obtained by summing the dry
Output · Methods §2.3, p. 54 (PDF p. 4)
The total dry weight of a tree was obtained by summing the dry weight of the stump, stem, and branches.
output.excludes · Methods §2.3, p. 54 (PDF p. 4)
Branches and twigs and leaves were determined
Output · Methods §2.5, p. 54 (PDF p. 4)
diameter at breast height (cm)
Units · Methods §2.6, p. 54 (PDF p. 4)
total tree height (m)
Units · Methods §2.6, p. 54 (PDF p. 4)
TAGB is the total aboveground biomass (kg)
Units · Methods §2.5, p. 54 (PDF p. 4)
AGB M2 9 -4.122
Trees measured · Table 1, Syzigium guineense row, pp. 56–57 (PDF pp. 6–7)
0.967 1.013 3.42
R² · Table 1, Syzigium guineense row, pp. 56–57 (PDF pp. 6–7)
0.967 1.013 3.42
Correction factor · Table 1, Syzigium guineense row, pp. 56–57 (PDF pp. 6–7)
to a natural logarithm to use the linear regression method
method · Methods §2.6, p. 54 (PDF p. 4)
Syzygium guineense
Taxon · Abstract, p. 51 (PDF p. 1)
For this study, the Homosha district was selected purpos-
Where · Methods §2.2, p. 53 (PDF p. 3)
Trees measured
9
R²
0.967
Correction factor
1.013 (applied)
Method
log-linear regression
Where
Homosha district, Asosa Zone, Benishangul-Gumuz, western Ethiopia
Last checked
2026-11-05
Calculate
Height from
177
Aboveground biomass, without leaves (kg)
83
Carbon (kg), ×0.47
304
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 = 20, H = 10177177Computed from the printed form
Calculated from the transcribed corrected form; the species-specific fitted diameter and height ranges are not reported.

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