Equations / Branch biomass
Mixed mangrove branch and twig biomass, power model (D^2 H)
Fitted on these 7 species: Bruguiera cylindrica, Bruguiera parviflora, Bruguiera sexangula, Ceriops tagal, Rhizophora apiculata, Rhizophora mucronata, Xylocarpus granatum
As printed (Table 2)
In this library's units, ready to compute (kg)
Branch biomass = 0.0221 * (D^2 * H)^0.8745D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Equation form a(D^2 H)^b read from Table 2 (printed 'D2H' with exponent; the paper's equation images were not in the text copy read). Output in kg dry mass. D was measured at about 1.37 m above ground, above the highest stilt root for Rhizophora (Section 2.2). H in the paper is "stem height" (Table 2 note; Section 2.3), not total tree height; it is mapped to canonical H here. The paper's best model, Eq. 3 with wood density (0.00475 ρ^0.6309 D^2.28787, R2 0.9697), is not added.
doi:10.3390/f13020325 · Open access · copy we read
Destructive sampling was conducted using the selective random sampling method on 15 standing trees.
in the range of DBH from 9.0 cm to 33.0 cm
0.6880
- Trees measured
- 15
- DBH range
- 9–33 cm
- R²
- 0.688
- Method
- power function (intrinsically linear), SPSS general linear model
- Where
- Sungai Pulai Forest Reserve, Johor
- 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, H = 12 | 10.9 | 10.9 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 20, H = 19.5 | 56 | 56 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 30, H = 22 | 126 | 126 | Computed from the printed form computed from the published form (coefficients as printed) |
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