Pseudotsuga menziesii / Aboveground biomass

Douglas-fir total aboveground biomass from DBH and height (Table 4)

Aboveground biomassPseudotsuga menziesii · PinaceaeUnited StatesmixedRead from the original paper

Equation

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

Douglas-fir a, b, c, d, CF: −2.8246 1.6385 1.0474 CF 1.0000; model form exp(a + bX1 + cX2)

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

Aboveground biomass = exp(-2.8246 + 1.6385 * ln(D) + 1.0474 * 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

Poudel, K. P., Temesgen, H., Radtke, P. J., & Gray, A. N. (2019). Estimating individual-tree aboveground biomass of tree species in the western U.S.A. Canadian Journal of Forest Research, 49(6), 701-714.

doi:10.1139/cjfr-2018-0361 · Open access · copy we read

Douglas-fir ... n 424

Trees measured · Table 1

Douglas-fir DBH min 1.8 max 114.0; HT min 2.4 max 64.0

Smallest DBH · Table 1

Trees measured: 424
DBH range: 1.8–114 cm
Height range: 2.4–64 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

DBH (cm)Height (m)

Height from

137

Aboveground biomass (kg)

64.4

Carbon (kg), ×0.47

236

CO₂e (kg), ×44/12

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%.

Inputs	Expected	We get	From
D = 20, H = 15	137	137	Computed from the printed form computed from the Table 4 coefficients
D = 40, H = 25	729	729	Computed from the printed form computed from the Table 4 coefficients

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Douglas-fir total aboveground biomass, simple SUR (D only) · Poudel & Temesgen 2016 · DBH
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Compare these curves

Douglas-fir total aboveground biomass from DBH and height (Table 4)

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