Equations / Root biomass
Liriodendron tulipifera Root W = aD + bD^2 (Table 10)
Root biomassLiriodendron tulipifera · MagnoliaceaeSouth KoreaplantationRead from the original paper
© Nicholas A. Tonelli · CC BY · iNaturalistEquation
As printed (Table 10 (W=aD+bD^2))
Root -1.943 0.155 0.919
In this library's units, ready to compute (kg)
Root biomass = -1.943 * D + 0.155 * D^2D- Diameter at breast height (1.3 m), cm
W = dry weight in kg (Table 7 in kg), D = DBH in cm. The paper prints no correction factor, so none is applied. Predicts negative biomass below about 12 cm DBH (authors' remark), so the authors prefer the power form. Only 21 of the 40 trees were excavated for roots; the paper does not state n or the DBH/height range for this equation, so they are omitted.
Source
doi:10.14578/jkfs.2016.105.4.463 · Open access · copy we read
- R²
- 0.919
- Method
- regression in SPSS 19.0
- Where
- Suwon (Gyeonggi), Jangseong and Gangjin (Jeollanam-do), South Korea
- Last checked
- 2026-11-02
Calculate
5.73
Root biomass (kg)
2.693
Carbon (kg), ×0.47
9.875
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 = 15 | 5.73 | 5.73 | Computed from the printed form computed from the Table 10 coefficients |
| D = 30 | 81.2 | 81.2 | Computed from the printed form computed from the Table 10 coefficients |
Related
- Liriodendron tulipifera Root W = aD^2H (Table 11) · Kang et al. 2016 · DBH + Height
- Liriodendron tulipifera Root W = aD^b (Table 10) · Kang et al. 2016 · DBH
- Liriodendron tulipifera Root W = a(D^2H)^b (Table 11) · Kang et al. 2016 · DBH + Height
- Liriodendron tulipifera Root W = aD^b H^c (Table 11) · Kang et al. 2016 · DBH + Height
- Liriodendron tulipifera Above ground W = aD^2H (Table 11) · same paper · Aboveground biomass
- Liriodendron tulipifera Above ground W = aD^b (Table 10) · same paper · Aboveground biomass
- Liriodendron tulipifera Above ground W = a(D^2H)^b (Table 11) · same paper · Aboveground biomass
- Liriodendron tulipifera Above ground W = aD^b H^c (Table 11) · same paper · Aboveground biomass
- Liriodendron tulipifera Above ground W = aD + bD^2 (Table 10) · same paper · Aboveground biomass
- Liriodendron tulipifera Branch W = aD^2H (Table 11) · same paper · Branch biomass
- Liriodendron tulipifera Branch W = aD^b (Table 10) · same paper · Branch biomass
- Liriodendron tulipifera Branch W = a(D^2H)^b (Table 11) · same paper · Branch biomass