Equations / Aboveground biomass
Common mangrove above-ground weight (Eq. 9)
Aboveground biomassMangroves (10 species: Rhizophora, Bruguiera, Ceriops, Avicennia, Sonneratia, Xylocarpus)Thailand, IndonesianaturalRead from the original paper
Many species, no single photo
Equation
As printed (Eq. 9, p. 475)
Wtop = 0.251ρ D^2.46
In this library's units, ready to compute (kg)
Aboveground biomass = 0.251 * rho * D^2.46rho- Wood density (oven-dry mass / green volume), g/cm³
D- Diameter at breast height (1.3 m), cm
Eq. 9 is Table 4's 0.247ρ(D²)^1.23 multiplied by CF 1.017. D = DR0.3 (diameter 30 cm above the highest prop root) for Rhizophoraceae and dbh for other species; Wtop excludes Rhizophora prop roots. ρ is wood density in t/m3 (= g/cm3). Trees with D > 5 cm.
Source
doi:10.1017/S0266467405002476 · Paywalled · copy we read
Wtop = 0.247ρ (D²)^1.23 0.979 0.085 1.017
The tree samples were 104 individuals including 10 species.
- Trees measured
- 104
- DBH range
- 5–48.9 cm
- R²
- 0.979
- Residual SE
- 0.085
- Correction factor
- 1.017 (applied)
- Method
- log-log regression, CF applied (Table 4)
- Where
- Mangrove forests of Thailand and Indonesia
- Last checked
- 2026-11-01
Calculate
319
Aboveground biomass (kg)
150
Carbon (kg), ×0.47
549
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 = 20, rho = 0.8 | 319 | 319 | Computed from the printed form hand-computed from the published form |
| D = 40, rho = 0.7 | 1,534 | 1,534 | Computed from the printed form hand-computed from the published form |
Related
- Common mangrove root weight (Eq. 10) · same paper · Root biomass