Equations / Stem biomass
White birch stem biomass from D only (MS-2) (Table 5)
Stem biomassBetula platyphylla · BetulaceaeChinanaturalRead from the original paper
© harum.koh · CC BY-SA · iNaturalistEquation
As printed (Table 5 (MS-2), White birch, stem row; model form Eq. (14) structure)
Ws = e^β20 · D^β21; White birch | Stem | -2.5622 | 2.515
In this library's units, ready to compute (kg)
Stem biomass = exp(-2.5622 + 2.515 * ln(D))D- Diameter at breast height (1.3 m), cm
White birch, additive system MS-2 (Table 5); W = exp(b0) * D^b1 (Eqs. 16 form per Table caption). Ranges and n from Table 2. The b0 column is the exponent of e (W = e^b0 ...), as in Eq. (14). Stem includes bark. Root excludes fine roots <5 mm. No R2 recorded (adjusted R2 only).
Source
doi:10.3390/f9050261 · Open access · copy we read
138 Dahurian larch trees and 108 white birch trees were destructively sampled
- Trees measured
- 108
- DBH range
- 1.4–20.5 cm
- Height range
- 3.1–21 m
- Method
- seemingly unrelated regression (SUR), additive system, W = exp(b0) D^b1 H^b2
- Where
- Eastern Daxing'an Mountains, Heilongjiang, northeast China
- Last checked
- 2026-11-02
Calculate
2.52
Stem biomass (kg)
1.184
Carbon (kg), ×0.47
4.343
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 = 4 | 2.52 | 2.52 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 10 | 25.2 | 25.2 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 18 | 110.7 | 110.7 | Computed from the printed form computed from the published form (coefficients as printed) |
Related
- White birch stem biomass from D and H (MS-3) (Table 6) · Dong et al. 2018 · DBH + Height
- Betula papyrifera stem biomass, cross-sectional area at 0.3 m (LLRC) · Flade et al. 2021 · D30
- Betula papyrifera stem biomass, cross-sectional area at 0.3 m (NLS) · Flade et al. 2021 · D30
- Betula pendula stem in bark biomass vs DBH (Eq. 4), forest-swamp, Middle Urals · Petrova et al. 2026 · DBH
- Birch stem biomass, young dense stands, N Sweden (Table 5) · Repola & Ahnlund Ulvcrona 2014 · DBH + Height
- White birch aboveground biomass from D only (MS-2) (sum of components, Table 5) · same paper · Aboveground biomass
- White birch branch biomass from D only (MS-2) (Table 5) · same paper · Branch biomass
- White birch foliage biomass from D only (MS-2) (Table 5) · same paper · Foliage biomass
- White birch root biomass from D only (MS-2) (Table 5) · same paper · Root biomass
- White birch total (above + below ground) biomass from D only (MS-2) (sum of components, Table 5) · same paper · Total biomass
- White birch aboveground biomass from D and H (MS-3) (sum of components, Table 6) · same paper · Aboveground biomass
- White birch branch biomass from D and H (MS-3) (Table 6) · same paper · Branch biomass
- White birch foliage biomass from D and H (MS-3) (Table 6) · same paper · Foliage biomass