# S. teysmaniana peat swamp, ln(AGB) on DBH and total height

Aboveground biomass equation for Shorea teysmaniana, Indonesia, from Akbar 2012. 20 trees, DBH 7.3–29.2 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Akbar 2012 (Tabel 3, row 3, p. 8):

> Ln(TAGB)= -2,99+2,35Ln(DBH)+0,44Ln(TBH)

Cite: https://treeallometry.org/equations/akbar-2012-dbh-h-ln/#equation

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

```
Aboveground biomass = exp(-2.99 + 2.35 * ln(D) + 0.44 * ln(H))
```

Inputs: D = Diameter at breast height (1.3 m) (cm); H = Total tree height (m).
The source's own form: exp(-2.99 + 2.35 * ln(DBH) + 0.44 * ln(TBH)), with DBH in cm, TBH in m; output in kg.
Cite: https://treeallometry.org/equations/akbar-2012-dbh-h-ln/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Shorea teysmaniana (species), family Dipterocarpaceae; broadleaf
- Where: Peat swamp forest, Barito Selatan, Central Kalimantan. Cite: https://treeallometry.org/equations/akbar-2012-dbh-h-ln/#where
- Biomes: tropical
- Stand: natural
- Trees measured: 20. Cite: https://treeallometry.org/equations/akbar-2012-dbh-h-ln/#n_trees
- DBH range: 7.3–29.2 cm. Cite: https://treeallometry.org/equations/akbar-2012-dbh-h-ln/#dbh
- Height range: 8.2–20.92 m. Cite: https://treeallometry.org/equations/akbar-2012-dbh-h-ln/#height
- R²: 0.99. Cite: https://treeallometry.org/equations/akbar-2012-dbh-h-ln/#r2
- Method: log-log regression. Cite: https://treeallometry.org/equations/akbar-2012-dbh-h-ln/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/akbar-2012-dbh-h-ln/#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

Akbar, A. (2012). Persamaan Allometrik untuk Menduga Kandungan Karbon Jenis Meranti (Shorea teysmaniana) di Hutan Alam Rawa Gambut Kalimantan Tengah. Jurnal Penelitian Sosial dan Ekonomi Kehutanan, 9(1), 1-11.

- DOI: https://doi.org/10.20886/jsek.2012.9.1.1-11
- Access: open access
- Copy we read: https://www.neliti.com/publications/29092/persamaan-allometrik-untuk-menduga-kandungan-karbon-jenis-meranti-shorea-teysman
- Every equation from this source: https://treeallometry.org/sources/akbar-2012/
- Cite: https://treeallometry.org/equations/akbar-2012-dbh-h-ln/#source

## The facts, in the source's words

**Equation** (Tabel 3, row 3, p. 8):

> Ln(TAGB)= -2,99+2,35Ln(DBH)+0,44Ln(TBH)

Cite: https://treeallometry.org/equations/akbar-2012-dbh-h-ln/#equation

**Trees measured** (Abstract / Tabel 3):

> n=20

Cite: https://treeallometry.org/equations/akbar-2012-dbh-h-ln/#quote-fit-n-trees

**R²** (Tabel 3):

> 0,99

Cite: https://treeallometry.org/equations/akbar-2012-dbh-h-ln/#quote-fit-r2

**Our note:** Table 1 gives DBH 7.30-29.20 cm and total height 8.20-20.92 m (n=20); the text says the models apply to 5-40 cm trees. R2 printed as 0,99 (rounded). The paper states no back-transform correction factor, so none is applied. Biomass is total aboveground (stem, branches, twigs, leaves). TBH is the total height (tinggi total).

## 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 | 33.6 | 33.6 | Computed from the printed form: hand-computed from the published form |
| D = 25, H = 18 | 346 | 346 | Computed from the printed form: hand-computed from the published form |

Cite: https://treeallometry.org/equations/akbar-2012-dbh-h-ln/#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: Akbar, A. (2012). Persamaan Allometrik untuk Menduga Kandungan Karbon Jenis Meranti (Shorea teysmaniana) di Hutan Alam Rawa Gambut Kalimantan Tengah. Jurnal Penelitian Sosial dan Ekonomi Kehutanan, 9(1), 1-11. https://doi.org/10.20886/jsek.2012.9.1.1-11

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "S. teysmaniana peat swamp, ln(AGB) on DBH and total height", checked 2026-11-02, https://treeallometry.org/equations/akbar-2012-dbh-h-ln/. 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/akbar-2012-dbh-h-ln.json
Report a problem: email info@restorationscope.com with the equation id (akbar-2012-dbh-h-ln) and where the right value appears.