Equations / Aboveground biomass

Mountain hemlock total aboveground biomass from DBH (Table 4)

Aboveground biomassTsuga mertensiana · PinaceaeUnited StatesmixedRead from the original paper

Equation

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

Mountain hemlock a, b, c, d, CF: −0.9861 2.0975 CF 1.0000; model form exp(a + bX1)

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

Aboveground biomass = exp(-0.9861 + 2.0975 * 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

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

Mountain hemlock ... n 9

Trees measured · Table 1

Mountain hemlock DBH min 13.5 max 76.2; HT min 6.1 max 37.2

Smallest DBH · Table 1

Trees measured: 9
DBH range: 13.5–76.2 cm
Height range: 6.1–37.2 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)

109.3

Aboveground biomass (kg)

51.37

Carbon (kg), ×0.47

188.3

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 = 15	109.3	109.3	Computed from the printed form computed from the Table 4 coefficients
D = 35	646.3	646.3	Computed from the printed form computed from the Table 4 coefficients

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Compare these curves

Mountain hemlock total aboveground biomass from DBH (Table 4)

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