Tree Allometrics

Combretum hartmannianum / Aboveground biomass, without leaves

Combretum hartmannianum aboveground biomass, M1

Aboveground biomass, without leavesCombretum hartmannianumEthiopiaRead 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.

No openly licensed photo yet
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(-1.763 + 2.232 * ln(D)) * 1.009
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 report substantial individual variation. The paper does not describe a held-out validation subset.

Source
-1.763(0.327)*** 2.232(0.139)***
Equation · Table 1, Combretum hartmannianum row, p. 56 (PDF p. 6)
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 11 -1.763
Trees measured · Table 1, Combretum hartmannianum row, p. 56 (PDF p. 6)
0.962 1.009 25.63
R² · Table 1, Combretum hartmannianum row, p. 56 (PDF p. 6)
0.962 1.009 25.63
Correction factor · Table 1, Combretum hartmannianum row, p. 56 (PDF p. 6)
to a natural logarithm to use the linear regression method
method · Methods §2.6, p. 54 (PDF p. 4)
Combretum hartmannianum
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
11
R²
0.962
Correction factor
1.009 (applied)
Method
log-linear regression
Where
Homosha district, Asosa Zone, Benishangul-Gumuz, western Ethiopia
Last checked
2026-11-05
Calculate
139
Aboveground biomass, without leaves (kg)
65.2
Carbon (kg), ×0.47
239
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 = 20139139Computed 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

Related

Compare these curves