Quercus ilex / Stem biomass
Quercus ilex stem with bark biomass (Table 2)
Stem biomassQuercus ilex · FagaceaeSpainmixedRead from the original paper
© Gianni Del Bufalo bygdb · CC BY · iNaturalistEquation
As printed (Table 2, Quercus ilex, Stem row)
Ws = 0.143 · d²
In this library's units, ready to compute (kg)
Stem biomass = 0.143 * D^2D- Diameter at breast height (1.3 m), cm
Stem with bark (commercial volume, up to a top diameter of 7 cm); fitted jointly with the branch equations by SUR to keep components additive. Stand type is not stated per species in the paper. Branch equations for this species are not added.
Source
doi:10.5424/fs/2112211-02193 · Open access · copy we read
Quercus ilex ... 43
Quercus ilex 7.8 85.9
- Trees measured
- 43
- DBH range
- 7.8–85.9 cm
- Height range
- 3.9–12.5 m
- Method
- seemingly unrelated regression with weighting
- Where
- Spain (sample zones per species, Figure 1)
- Last checked
- 2026-11-02
Calculate
32.2
Stem biomass (kg)
15.1
Carbon (kg), ×0.47
55.4
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 | 32.2 | 32.2 | Computed from the printed form computed from the Table 2 coefficients |
| D = 35 | 175 | 175 | Computed from the printed form computed from the Table 2 coefficients |
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