Tree Allometrics

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Iriartea deltoidea AGB from diameter and stem height

Aboveground biomassIriartea deltoidea · ArecaceaePerunaturalRead from the original paper
Photo of Iriartea deltoidea
© Dick Culbert · CC BY · iNaturalist
Equation

As printed (Table 3)

Iriartea ln(AGB) ln(D2Hstem) -3.483 0.94371 0.967 21 0.311

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

Aboveground biomass = 1.0495 * exp(-3.483 + 0.94371 * ln(D^2 * Hstem))
D
Diameter at breast height (1.3 m), cm
Hstem
Palm stem height, ground to the lowest leaf, m

Hstem = stem height, ground to the base of the lowest leaf (new canonical variable Hstem, m), not total height. Fitted Hstem range 3.3–21.8 m. Correction factor exp(0.311²/2) multiplied in.

Source
MdD Iriartea deltoidea 21 6-33 3.3-21.8 5.6-25.1
Smallest DBH · Table 1 (n, D cm, Hstem m, Htot m)
A correction factor, exp(RSE2/2), was applied to biomass estimates from logarithmically transformed models (Baskerville, 1972).
Correction factor · Section 2.4, lines 220–221 (author post-print)
Trees measured
21
DBH range
6–33 cm
R²
0.967
Residual SE
0.311
Correction factor
1.0495 (applied)
Method
OLS on ln(AGB) vs ln(D²·Hstem); Baskerville correction exp(RSE²/2)
Where
Terra firme moist forest, forestry concession, Madre de Dios, Peru
Last checked
2026-11-01
Calculate
118.5
Aboveground biomass (kg)
55.71
Carbon (kg), ×0.47
204.3
CO₂e (kg), ×44/12
Fitted DBH range0100200300400500510152025303540DBH (cm)Aboveground biomass (kg)Aboveground biomass

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, Hstem = 15118.5118.5Computed from the printed form
computed from the Table 3 coefficients times exp(RSE²/2)

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