# Sonneratia alba stem biomass, power model (D)

Stem biomass equation for Sonneratia alba, Indonesia, from Pathibang et al. 2026. 8 trees. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Pathibang et al. 2026 (Table 3, Power row):

> Power B = 0.036D^2.503 96.8% 0.131

Cite: https://treeallometry.org/equations/pathibang-2026-stem-power/#equation

In this library's units, ready to compute (stem biomass in kg):

```
Stem biomass = 0.036 * D^2.503
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: 0.036 * D^2.503, with D in cm; output in kg.
Cite: https://treeallometry.org/equations/pathibang-2026-stem-power/#canonical

## What it covers

- Output: Stem biomass, kg
- Taxon: Sonneratia alba (species); mangrove
- Where: Tanah Merah Mangrove Forest, Kupang, East Nusa Tenggara. Cite: https://treeallometry.org/equations/pathibang-2026-stem-power/#where
- Biomes: tropical, mangrove
- Stand: natural
- Trees measured: 8. Cite: https://treeallometry.org/equations/pathibang-2026-stem-power/#n_trees
- R²: 0.968. Cite: https://treeallometry.org/equations/pathibang-2026-stem-power/#r2
- Method: power model B = a D^b. Cite: https://treeallometry.org/equations/pathibang-2026-stem-power/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/pathibang-2026-stem-power/#checked_at

A missing fit statistic is one the source doesn't state, or that we haven't recorded; it is never estimated. Outside the stated DBH range or region, the equation is an extrapolation.

## Source

Pathibang, M.R., Ora, Y.A.N.R., Almuqu, A.A., et al. (2026). Allometric Biomass Equation Model of Sonneratia alba in Tanah Merah Mangrove Forest, Kupang, East Nusa Tenggara, Indonesia. Jurnal Penelitian Pendidikan IPA, 12(5), 906-915.

- DOI: https://doi.org/10.29303/jppipa.v12i5.15100
- Access: open access
- Copy we read: https://jppipa.unram.ac.id/index.php/jppipa/article/download/15100/10027
- Every equation from this source: https://treeallometry.org/sources/pathibang-2026/
- Cite: https://treeallometry.org/equations/pathibang-2026-stem-power/#source

## The facts, in the source's words

**Equation** (Table 3, Power row):

> Power B = 0.036D^2.503 96.8% 0.131

Cite: https://treeallometry.org/equations/pathibang-2026-stem-power/#equation

**Trees measured** (Results and Discussion, p. 908):

> A total of 14 trees were felled to serve as measurement samples: 8 for model development and 6 for model validation.

Cite: https://treeallometry.org/equations/pathibang-2026-stem-power/#quote-fit-n-trees

**R²** (Table 3, Power row):

> 96.8%

Cite: https://treeallometry.org/equations/pathibang-2026-stem-power/#quote-fit-r2

**Our note:** Stand origin is not stated in the paper; classified natural from its reference to natural forest stands. Fitted on 8 of the 14 felled trees (the other 6 were held out for validation); the paper prints no DBH range for the fitting trees.

## Checks this equation passes

On every build, the library's form and the source's own form (in its units) must both give these values within 1%.

| Inputs | Expected | We get | From |
| --- | --- | --- | --- |
| D = 12 | 18.1 | 18.1 | Computed from the printed form: computed from the published form (coefficients as printed) |
| D = 18 | 49.9 | 49.9 | Computed from the printed form: computed from the published form (coefficients as printed) |
| D = 26 | 125.3 | 125.3 | Computed from the printed form: computed from the published form (coefficients as printed) |

Cite: https://treeallometry.org/equations/pathibang-2026-stem-power/#checks

The calculator on the page shows carbon as biomass × 0.47 (IPCC 2006 Guidelines, Vol. 4, Ch. 4, Table 4.3) and CO₂e as carbon × 44/12.

## How to cite

Cite the source for the equation: Pathibang, M.R., Ora, Y.A.N.R., Almuqu, A.A., et al. (2026). Allometric Biomass Equation Model of Sonneratia alba in Tanah Merah Mangrove Forest, Kupang, East Nusa Tenggara, Indonesia. Jurnal Penelitian Pendidikan IPA, 12(5), 906-915. https://doi.org/10.29303/jppipa.v12i5.15100

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Sonneratia alba stem biomass, power model (D)", checked 2026-11-02, https://treeallometry.org/equations/pathibang-2026-stem-power/. Data CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Quotes are the authors' words.

Data for this equation: https://treeallometry.org/data/equations/pathibang-2026-stem-power.json
Report a problem: email info@restorationscope.com with the equation id (pathibang-2026-stem-power) and where the right value appears.