Equations / Stem biomass
Pinus sylvestris stem in bark biomass vs DBH (Eq. 4), forest-swamp, Middle Urals
© Douglas Goldman · CC BY-SA · iNaturalistAs printed (Eq. (4) and Table 4, p. 126)
In this library's units, ready to compute (kg)
Stem biomass = exp(-2.4721 + 2.261 * ln(D))D- Diameter at breast height (1.3 m), cm
The Baskerville log-correction is already in the printed intercept a0 (Table 4 footnote), so no separate factor. adjusted R2 reported: 0.976 (not used as r2). Pa excludes dead branches (reported separately as Pmort); the contract cannot express that exclusion. Only the 4 main fractions (stem in bark, branches, foliage, total) are added; bark and dead-branch fits omitted. 18 birch and 12 pine trees from 4 plots in one forest-swamp system. Sampled pines are P. sylvestris f. uliginosa and f. litwinowii (Table 1, p. 121).
doi:10.51318/fret.2026.98.3.012 · Open access · copy we read
18 и 12 деревьев соответственно березы и сосны
- Trees measured
- 12
- DBH range
- 2.4–21.3 cm
- Height range
- 3.67–12.8 m
- Residual SE
- 0.229
- Method
- log-log regression (OLS on natural logs); Baskerville correction included in the intercept
- Where
- Forest-swamp system by Lake Isetskoe, Sverdlovsk Oblast, Middle Urals
- Last checked
- 2026-11-01
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 = 5 | 3.21 | 3.21 | Computed from the printed form hand-computed from the published form (Table 4 coefficients) |
| D = 10 | 15.4 | 15.4 | Computed from the printed form hand-computed from the published form (Table 4 coefficients) |
| D = 15 | 38.5 | 38.5 | Computed from the printed form hand-computed from the published form (Table 4 coefficients) |
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