Tsuga heterophylla / Aboveground biomass

Western hemlock total aboveground biomass from DBH and height (Table 4)

Aboveground biomassTsuga heterophylla · PinaceaeUnited StatesmixedRead from the original paper

Equation

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

Western hemlock a, b, c, d, CF: −2.7552 1.8521 0.7642 CF 1.0209; model form exp(a + bX1 + cX2)

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

Aboveground biomass = 1.0209 * exp(-2.7552 + 1.8521 * ln(D) + 0.7642 * 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

Western hemlock ... n 115

Trees measured · Table 1

Western hemlock DBH min 3.1 max 77.8; HT min 3.5 max 53.0

Smallest DBH · Table 1

Trees measured: 115
DBH range: 3.1–77.8 cm
Height range: 3.5–53 m
Correction factor: 1.0209 (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

DBH (cm)Height (m)

Height from

132

Aboveground biomass (kg)

62.1

Carbon (kg), ×0.47

228

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	132	132	Computed from the printed form computed from the Table 4 coefficients
D = 40, H = 25	705	705	Computed from the printed form computed from the Table 4 coefficients

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Compare these curves

Western hemlock total aboveground biomass from DBH and height (Table 4)

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