# Mixed mangrove total aboveground biomass, power model (D^2 H)

Aboveground biomass equation for Seven mangrove species (Bruguiera cylindrica, B. parviflora, B. sexangula, Ceriops tagal, Rhizophora apiculata, R. mucronata, Xylocarpus granatum), Malaysia, from Abdul-Hamid et al. 2022. 15 trees, DBH 9–33 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

Fitted on Bruguiera cylindrica, Bruguiera parviflora, Bruguiera sexangula, Ceriops tagal, Rhizophora apiculata, Rhizophora mucronata, Xylocarpus granatum.

## Equation

As printed in Abdul-Hamid et al. 2022 (Table 2):

> Total biomass 0.0739D2H0.9291 0.9556

Cite: https://treeallometry.org/equations/abdul-hamid-2022-total-d2h/#equation

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

```
Aboveground biomass = 0.0739 * (D^2 * H)^0.9291
```

Inputs: D = Diameter at breast height (1.3 m) (cm); H = Total tree height (m).
The source's own form: 0.0739 * (D^2 * H)^0.9291, with D in cm, H in m; output in kg.
Cite: https://treeallometry.org/equations/abdul-hamid-2022-total-d2h/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Seven mangrove species (Bruguiera cylindrica, B. parviflora, B. sexangula, Ceriops tagal, Rhizophora apiculata, R. mucronata, Xylocarpus granatum) (mixed species); mangrove
- Where: Sungai Pulai Forest Reserve, Johor. Cite: https://treeallometry.org/equations/abdul-hamid-2022-total-d2h/#where
- Biomes: tropical, mangrove
- Stand: natural
- Trees measured: 15. Cite: https://treeallometry.org/equations/abdul-hamid-2022-total-d2h/#n_trees
- DBH range: 9–33 cm. Cite: https://treeallometry.org/equations/abdul-hamid-2022-total-d2h/#dbh
- R²: 0.9556. Cite: https://treeallometry.org/equations/abdul-hamid-2022-total-d2h/#r2
- Method: power function (intrinsically linear), SPSS general linear model. Cite: https://treeallometry.org/equations/abdul-hamid-2022-total-d2h/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/abdul-hamid-2022-total-d2h/#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

Abdul-Hamid, H., Mohamad-Ismail, F.-N., Mohamed, J., et al. (2022). Allometric Equation for Aboveground Biomass Estimation of Mixed Mature Mangrove Forest. Forests, 13(2), 325.

- DOI: https://doi.org/10.3390/f13020325
- Access: open access
- Copy we read: https://www.mdpi.com/1999-4907/13/2/325
- Every equation from this source: https://treeallometry.org/sources/abdul-hamid-2022/
- Cite: https://treeallometry.org/equations/abdul-hamid-2022-total-d2h/#source

## The facts, in the source's words

**Equation** (Table 2):

> Total biomass 0.0739D2H0.9291 0.9556

Cite: https://treeallometry.org/equations/abdul-hamid-2022-total-d2h/#equation

**Trees measured** (Abstract):

> Destructive sampling was conducted using the selective random sampling method on 15 standing trees.

Cite: https://treeallometry.org/equations/abdul-hamid-2022-total-d2h/#quote-fit-n-trees

**Smallest DBH** (Section 3.1):

> in the range of DBH from 9.0 cm to 33.0 cm

Cite: https://treeallometry.org/equations/abdul-hamid-2022-total-d2h/#quote-fit-dbh-min-cm

**R²** (Table 2):

> 0.9556

Cite: https://treeallometry.org/equations/abdul-hamid-2022-total-d2h/#quote-fit-r2

**Our note:** 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.

## 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 = 10, H = 12 | 53.6 | 53.6 | Computed from the printed form: computed from the published form (coefficients as printed) |
| D = 20, H = 19.5 | 305 | 305 | Computed from the printed form: computed from the published form (coefficients as printed) |
| D = 30, H = 22 | 726 | 726 | Computed from the printed form: computed from the published form (coefficients as printed) |

Cite: https://treeallometry.org/equations/abdul-hamid-2022-total-d2h/#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: Abdul-Hamid, H., Mohamad-Ismail, F.-N., Mohamed, J., et al. (2022). Allometric Equation for Aboveground Biomass Estimation of Mixed Mature Mangrove Forest. Forests, 13(2), 325. https://doi.org/10.3390/f13020325

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Mixed mangrove total aboveground biomass, power model (D^2 H)", checked 2026-11-02, https://treeallometry.org/equations/abdul-hamid-2022-total-d2h/. 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/abdul-hamid-2022-total-d2h.json
Report a problem: email info@restorationscope.com with the equation id (abdul-hamid-2022-total-d2h) and where the right value appears.