Equations / Root biomass

Common mangrove root weight (Eq. 10)

Root biomassMangroves (10 species: Rhizophora, Bruguiera, Ceriops, Avicennia, Sonneratia, Xylocarpus)Thailand, IndonesianaturalRead from the original paper

Many species, no single photo

Equation

As printed (Eq. 10, p. 475)

WR = 0.199ρ^0.899 D^2.22

In this library's units, ready to compute (kg)

Root biomass = 0.199 * rho^0.899 * D^2.22

rho: Wood density (oven-dry mass / green volume), g/cm³
D: Diameter at breast height (1.3 m), cm

Root weight includes the prop roots of Rhizophora. D = DR0.3 for Rhizophoraceae, dbh otherwise. Eq. 10 is Table 4's form times CF 1.017.

Source

Komiyama, A., Poungparn, S., Kato, S. (2005). Common allometric equations for estimating the tree weight of mangroves. Journal of Tropical Ecology, 21(4), 471–477.

doi:10.1017/S0266467405002476 · Paywalled · copy we read

WR = 0.196ρ^0.899 (D²)^1.11 0.954 0.181 1.017

Fit · Table 4 (equation before CF)

Within the 104 tree samples, 26 individual trees were

Trees measured · Methods, p. 472

Trees measured: 26
R²: 0.954
Residual SE: 0.181
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

Wood density (g/cm³)DBH (cm)

126

Root biomass (kg)

59.2

Carbon (kg), ×0.47

217

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	126	126	Computed from the printed form hand-computed from the published form

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Common mangrove above-ground weight (Eq. 9) · same paper · Aboveground biomass

Common mangrove root weight (Eq. 10)

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