Pinus tabuliformis / Branch biomass
Chinese pine branch biomass from DBH (age-sequence plantations)
© Ianz on Flickr · CC BY-SA · iNaturalistAs printed (Section 2.3, Eq. 1)
In this library's units, ready to compute (kg)
Branch biomass = 0.0583 * D^2.0492D- Diameter at breast height (1.3 m), cm
M = aD^b. Power model M = aD^b (or a(D²H)^b) fitted by non-linear least squares (no log back-transform). Sample trees were 60 destructively harvested trees from stands aged 8, 18, 32 and 46 years; the paper does not give the DBH or height range of the sample trees (Table 1 gives stand means only), so none is given. Roots are coarse roots (>5 mm), so the root and total-tree equations leave out fine roots. The third form in Table 3, M = aD^b A^c, needs stand age (not a canonical variable) and is not added.
doi:10.3390/f16121760 · Open access · copy we read
Branch (1) 0.0583 2.0492 0.931 287 <0.001
Branch (1) 0.0583 2.0492 0.931 287 <0.001
In total, 60 sample trees were selected for the destructive measurement.
- Trees measured
- 60
- R²
- 0.931
- Method
- non-linear least squares
- Where
- Lahailing forestry station, Chengde, northern Hebei Province
- 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 = 10 | 6.53 | 6.53 | Computed from the printed form hand-computed from the published form |
| D = 25 | 42.7 | 42.7 | Computed from the printed form hand-computed from the published form |
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