Equations / Stem biomass
Lodgepole pine bole biomass, simple SUR (D only)
© Alison Northup · CC BY · iNaturalistAs printed (Eqs. 2-5 (X1 = ln DBH) and Table 3, Simple SUR, Lodgepole pine)
In this library's units, ready to compute (kg)
Stem biomass = exp(-2.374 + 2.373 * ln(D))D- Diameter at breast height (1.3 m), cm
Read from the author's accepted manuscript (draft, manuscript ID cjfr-2015-0256.R1), not the typeset article; values may differ from the final print. Fitted in original scale (nonlinear SUR), so no log back-transform correction. DBH in cm, biomass in kg (Eq. 2-5 text). Bole is stem wood; bark is reported as a separate component (not provided here as there is no matching output quantity). Extended SUR models using height and crown length are not included (crown length is not a canonical variable).
doi:10.1139/cjfr-2015-0256 · Open access · copy we read
22 Douglas-fir (Pseudotsuga menziesii (Mirbel) Franco) and 33 lodgepole pine (Pinus contorta) trees
- Trees measured
- 33
- DBH range
- 13.5–42.9 cm
- Method
- seemingly unrelated regression (simple SUR), component equations constrained to sum to total, fitted in original scale
- Where
- Oregon, USA (several forests)
- Last checked
- 2026-11-02
Shaded: the DBH range the model was fitted on. Other inputs held at the values above.
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 | 57.5 | 57.5 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 25 | 193.3 | 193.3 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 40 | 589.8 | 589.8 | Computed from the printed form computed from the published form (coefficients as printed) |
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