Pinus sylvestris / Branch biomass
Mongolian pine (Pinus sylvestris var. mongolica) branch biomass from D only (System 1, Table 4)
Branch biomassPinus sylvestris var. mongolica · PinaceaeChinaplantationRead from the original paper
© Douglas Goldman · CC BY-SA · iNaturalistEquation
As printed (Eqs. (1) and Table 4)
lnWb = a* + b* × lnD; Table 4, Mongolian pine, System 1 (D only): Branch | -4.82 | 2.5112
In this library's units, ready to compute (kg)
Branch biomass = exp(-4.82 + 2.5112 * ln(D))D- Diameter at breast height (1.3 m), cm
Mongolian pine (Pinus sylvestris var. mongolica) plantations, System 1 (D only) of Table 4: ln W = a* + b* ln D, natural logarithm, coefficients as printed (a*, b*, c*). No correction factor is stated in the paper, none applied. n and D/H ranges from Table 2 (sample statistics of the fitted trees). Stem includes bark; roots exclude fine roots <5 mm. No R2 recorded (adjusted R2 only).
Source
doi:10.3390/f7070136 · Open access · copy we read
a total of 114 Korean pine trees, 90 larch trees, and 85 Mongolian pine trees were destructively sampled
- Trees measured
- 85
- DBH range
- 6–38.7 cm
- Height range
- 3.5–22.3 m
- Method
- seemingly unrelated regression (SUR) on log-transformed additive system, ln W = a + b ln D
- Where
- Pure plantations, northeast China
- Last checked
- 2026-11-02
Calculate
2.18
Branch biomass (kg)
1.03
Carbon (kg), ×0.47
3.76
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 = 9.3 | 2.18 | 2.18 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 19.1 | 13.3 | 13.3 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 32.2 | 49.3 | 49.3 | Computed from the printed form computed from the published form (coefficients as printed) |
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- Korean pine aboveground biomass from D only (sum of components, System 1) · same paper · Aboveground biomass
- Korean pine branch biomass from D only (System 1, Table 4) · same paper · Branch biomass
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- Korean pine total (above + below ground) biomass from D only (sum of components, System 1) · same paper · Total biomass
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