Equations / Aboveground biomass
Douglas-fir total aboveground biomass, simple SUR (D only)
© Danny Steaven · CC BY-SA · iNaturalistAs printed (Eq. 6 and Table 3, Simple SUR, Douglas-fir)
In this library's units, ready to compute (kg)
Aboveground biomass = exp(-0.349 + 1.925 * ln(D)) + exp(-3.247 + 1.919 * ln(D)) + exp(-2.604 + 1.942 * ln(D)) + exp(-3.242 + 1.758 * 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. Total is the sum of the four component equations (bole, bark, branch, foliage) from the constrained SUR system, so it includes foliage and bark. Fitted in original scale, no correction factor. Extended SUR models (height, crown length) not included.
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
- 22
- DBH range
- 19.3–114 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 = 20 | 270 | 270 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 50 | 1,571 | 1,571 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 100 | 5,956 | 5,956 | Computed from the printed form computed from the published form (coefficients as printed) |
Related
- Douglas-fir total aboveground biomass from DBH and height (Table 4) · Poudel et al. 2019 · DBH + Height
- Douglas-fir branch biomass, simple SUR (D only) · same paper · Branch biomass
- Douglas-fir foliage biomass, simple SUR (D only) · same paper · Foliage biomass
- Douglas-fir bole biomass, simple SUR (D only) · same paper · Stem biomass
- Lodgepole pine total aboveground biomass, simple SUR (D only) · same paper · Aboveground biomass
- Lodgepole pine branch biomass, simple SUR (D only) · same paper · Branch biomass
- Lodgepole pine foliage biomass, simple SUR (D only) · same paper · Foliage biomass
- Lodgepole pine bole biomass, simple SUR (D only) · same paper · Stem biomass