Equations / Aboveground biomass
Sitka spruce total aboveground biomass from DBH and height (Table 4)
Aboveground biomassPicea sitchensis · PinaceaeUnited StatesmixedRead from the original paper
© Aaron Liston · CC BY · iNaturalistEquation
As printed (Table 4, species row and table note)
Sitka spruce a, b, c, d, CF: −2.5826 1.8196 0.7108 CF 1.0091; model form exp(a + bX1 + cX2)
In this library's units, ready to compute (kg)
Aboveground biomass = 1.0091 * exp(-2.5826 + 1.8196 * ln(D) + 0.7108 * 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
doi:10.1139/cjfr-2018-0361 · Open access · copy we read
Sitka spruce ... n 19
Sitka spruce DBH min 7.2 max 47.8; HT min 4.6 max 40.7
- Trees measured
- 19
- DBH range
- 7.2–47.8 cm
- Height range
- 4.6–40.7 m
- Correction factor
- 1.0091 (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
121.8
Aboveground biomass (kg)
57.25
Carbon (kg), ×0.47
209.9
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 | 121.8 | 121.8 | Computed from the printed form computed from the Table 4 coefficients |
| D = 40, H = 25 | 618.1 | 618.1 | Computed from the printed form computed from the Table 4 coefficients |
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