Tree Allometrics

Abies amabilis / Aboveground biomass

Pacific silver fir total aboveground biomass from DBH and height (Table 4)

Aboveground biomassAbies amabilis · PinaceaeUnited StatesmixedRead from the original paper
Photo of Abies amabilis
Todd Folsom · CC0 · iNaturalist
Equation

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

Pacific silver fir a, b, c, d, CF: −2.7231 1.8546 0.7567 CF 1.0000; model form exp(a + bX1 + cX2)

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

Aboveground biomass = exp(-2.7231 + 1.8546 * ln(D) + 0.7567 * ln(H))
D
Diameter at breast height (1.3 m), cm
H
Total tree height, m

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
Pacific silver fir ... n 37
Trees measured · Table 1
Pacific silver fir DBH min 4.5 max 90.4; HT min 3.1 max 40.3
Smallest DBH · Table 1
Trees measured
37
DBH range
4.5–90.4 cm
Height range
3.1–40.3 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
Height from
132
Aboveground biomass (kg)
62
Carbon (kg), ×0.47
227
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, H = 15132132Computed from the printed form
computed from the Table 4 coefficients
D = 40, H = 25702702Computed from the printed form
computed from the Table 4 coefficients

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