Pinus patula / Stem biomass
Pinus patula Stem biomass from D and H (Table 4)
© Lauu · CC BY · iNaturalistAs printed (Section 3.1 (Model 1, Table 1))
In this library's units, ready to compute (kg)
Stem biomass = exp(-5.0347 + 1.7423 * ln(D * H))D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Printed form y = e^(−β0 + β1 ln(D × TH)); the tabulated β0 is positive and enters with a minus sign, as printed. Units are D in cm, TH in m, biomass in kg dry weight (Figure 3). No correction factor stated. Parameters read from Table 4 of the journal PDF (p. 165); the HTML version offers no CSV for Table 4. The paper also fits an additive simultaneous system (Table 6) with slightly different parameters; not added. The foliage model (Table 4: ϖ0 8.1986, ϖ1 1.6628, R2 0.9762) is not added here; the printed additive formula in Section 3.3 shows the foliage intercept without the minus sign, but Figure 3(d) (p. 166) prints the fitted foliage curve as y = e^(−8.198579+(1.66277 ln(D x TH))), n=25, so the sign is a typesetting slip and the model could be added as exp(−8.1986 + 1.6628 ln(D × TH)). Authors recommend use for 5 to 25 cm DBH.
doi:10.1080/21580103.2020.1801526 · Open access · copy we read
β0 5.0347, β1 1.7423, R2 0.9848
a destructive analysis was made of 25 trees distributed in five diameter classes
diameter at breast height (D) that varied from 3.5 cm to 25.7 cm, with a total height (TH) fluctuating from 4.32 m to 20.18 m
- Trees measured
- 25
- DBH range
- 3.5–25.7 cm
- Height range
- 4.32–20.18 m
- R²
- 0.9848
- Method
- nonlinear regression (SAS PROC MODEL), exponential form
- Where
- Ixtlán de Juárez, Sierra Norte, Oaxaca (pine-oak forest)
- 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 = 8, H = 7 | 7.23 | 7.23 | Computed from the printed form computed from the published form |
| D = 13, H = 12 | 43.1 | 43.1 | Computed from the printed form computed from the published form |
| D = 22, H = 18 | 218 | 218 | Computed from the printed form computed from the published form |
Related
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- Pinus cembroides, additive system S2 (D and H): stem biomass · Cuevas Cruz & Aquino Ramírez 2020 · DBH + Height
- Pinus brutia stem biomass, Lebanon (Eq. 35) · de-Miguel et al. 2014 · DBH + Height
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- Pinus brutia stem biomass, Middle East (Eq. 45) · de-Miguel et al. 2014 · DBH + Height
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- Pinus patula Branch biomass from D and H (Table 4) · same paper · Branch biomass
- Pinus patula Belowground (root) biomass from D and H (Table 5) · same paper · Root biomass
- Pinus patula Total biomass (roots, stem, branches, foliage) from D and H (Table 3) · same paper · Total biomass