Tree Allometrics

Abies grandis / Aboveground biomass

Grand fir total aboveground biomass from DBH (Table 4)

Aboveground biomassAbies grandis · PinaceaeUnited StatesmixedRead from the original paper
Photo of Abies grandis
© Dave Powell · CC BY · iNaturalist
Equation

As printed (Table 4, species row and table note)

Grand fir a, b, c, d, CF: −2.2106 2.4297 CF 1.0000; model form exp(a + bX1)

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

Aboveground biomass = exp(-2.2106 + 2.4297 * ln(D))
D
Diameter at breast height (1.3 m), cm

AGB is total aboveground live-tree biomass (stem, bark, branches, foliage). X1 = ln(DBH), X2 = ln(HT), DBH in cm and HT in m. Species identified from the common name in Table 4 (scientific name added from the standard species symbol). Stand type is not stated. Observed ranges in Table 1 cover all trees of the species used.

Source
Grand fir ... n 17
Trees measured · Table 1
Grand fir DBH min 12.4 max 84.3; HT min 8.7 max 44.4
Smallest DBH · Table 1
Trees measured
17
DBH range
12.4–84.3 cm
Height range
8.7–44.4 m
Method
nonlinear regression, response not log-transformed (CF = 1.0000)
Where
Western U.S.A., legacy destructive-sampling biomass collection (Radtke et al. 2015)
Last checked
2026-11-02
Calculate
79
Aboveground biomass (kg)
37.1
Carbon (kg), ×0.47
136
CO₂e (kg), ×44/12
Fitted DBH range02004006008001,000510152025303540DBH (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 = 157979Computed from the printed form
computed from the Table 4 coefficients
D = 35619619Computed from the printed form
computed from the Table 4 coefficients

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