Tree Allometrics

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Utah juniper total aboveground biomass from DBH (Table 4)

Aboveground biomassJuniperus osteosperma · CupressaceaeUnited StatesmixedRead from the original paper
Photo of Juniperus osteosperma
© Michael J. Papay · CC BY · iNaturalist
Equation

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

Utah juniper a, b, c, d, CF: −0.7457 1.8999 CF 1.0000; model form exp(a + bX1)

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

Aboveground biomass = exp(-0.7457 + 1.8999 * 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
Utah juniper ... n 33
Trees measured · Table 1
Utah juniper DBH min 4.1 max 50.5; HT min 2.7 max 9.4
Smallest DBH · Table 1
Trees measured
33
DBH range
4.1–50.5 cm
Height range
2.7–9.4 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
81.4
Aboveground biomass (kg)
38.26
Carbon (kg), ×0.47
140.3
CO₂e (kg), ×44/12
Fitted DBH range0100200300400500600510152025303540DBH (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 = 1581.481.4Computed from the printed form
computed from the Table 4 coefficients
D = 35407.1407.1Computed from the printed form
computed from the Table 4 coefficients

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