Pterocarpus lucens / Aboveground biomass, without leaves

Pterocarpus lucens aboveground biomass, M1

Aboveground biomass, without leavesPterocarpus lucensEthiopiaRead 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.

Equation

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

ln(B) = ln(β0) + β1ln(DBH) + Ɛ M1

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

Aboveground biomass, without leaves = exp(-2.723 + 2.657 * ln(D)) * 1.025

D: Diameter at breast height (1.3 m), cm

The table coefficient is back-transformed and multiplied once by the printed correction factor. DBH is measured at 1.3 m. Table 1 describes R² as adjusted. The authors selected M1 for this species and emphasize applying the correction factor. The paper does not describe a held-out validation subset.

Source

Tena, A., Tolera, M., Abich, A., and Tamirat, T. (2026). Biomass Estimation Models for Combretum-Terminalia Woodlands of Western Ethiopia: Implications for Carbon Accounting, Climate-Change Mitigation, and Biodiversity Conservation. Ecology and Evolutionary Biology, 11(3), 51–61.

doi:10.11648/j.eeb.20261103.12 · Peer-reviewed · Open access · copy we read

-2.723(0.389)*** 2.657(0.128)***

Equation · Table 1, Pterocarpus lucens row, p. 57 (PDF p. 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)

TAGB is the total aboveground biomass (kg)

Units · Methods §2.5, p. 54 (PDF p. 4)

AGB M1 12 -2.723

Trees measured · Table 1, Pterocarpus lucens row, p. 57 (PDF p. 7)

0.975 1.025 17.31

R² · Table 1, Pterocarpus lucens row, p. 57 (PDF p. 7)

0.975 1.025 17.31

Correction factor · Table 1, Pterocarpus lucens row, p. 57 (PDF p. 7)

to a natural logarithm to use the linear regression method

method · Methods §2.6, p. 54 (PDF p. 4)

Pterocarpus lucens

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: 12
R²: 0.975
Correction factor: 1.025 (applied)
Method: log-linear regression
Where: Homosha district, Asosa Zone, Benishangul-Gumuz, western Ethiopia
Last checked: 2026-11-05

Calculate

DBH (cm)

193

Aboveground biomass, without leaves (kg)

90.6

Carbon (kg), ×0.47

332

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
D = 20	193	193	Computed from the printed form Calculated from the transcribed corrected form; the species-specific fitted diameter range is not reported.

Report a problem with this equation · JSON

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Pterocarpus lucens aboveground biomass, M1

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