Tree Allometrics

Alnus rubra / Aboveground biomass

Red alder total aboveground biomass from DBH and height (Table 4)

Aboveground biomassAlnus rubra · BetulaceaeUnited StatesmixedRead from the original paper
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Equation

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

Red alder a, b, c, d, CF: −3.8516 2.3174 0.6283 CF 1.0281; model form exp(a + bX1 + cX2)

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

Aboveground biomass = 1.0281 * exp(-3.8516 + 2.3174 * ln(D) + 0.6283 * 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
Red alder ... n 25
Trees measured · Table 1
Red alder DBH min 9.3 max 51.8; HT min 7.4 max 31.6
Smallest DBH · Table 1
Trees measured
25
DBH range
9.3–51.8 cm
Height range
7.4–31.6 m
Correction factor
1.0281 (applied)
Method
regression on ln(AGB) with Baskerville log-bias correction factor
Where
Western U.S.A., legacy destructive-sampling biomass collection (Radtke et al. 2015)
Last checked
2026-11-02
Calculate
Height from
124
Aboveground biomass (kg)
58.3
Carbon (kg), ×0.47
214
CO₂e (kg), ×44/12
Fitted DBH range0100200300400500600700510152025303540DBH (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 = 15124124Computed from the printed form
computed from the Table 4 coefficients
D = 40, H = 25852852Computed from the printed form
computed from the Table 4 coefficients

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