# Tectona grandis AGB from D

Aboveground biomass equation for Tectona grandis, Thailand, from Ounban et al. 2016. 84 trees, DBH 4.4–41.2 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Ounban et al. 2016 (Table 5):

> AGB = 0.077(D)2.546

Cite: https://treeallometry.org/equations/ounban-2016-teak-agb-d/#equation

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

```
Aboveground biomass = 0.077 * D^2.546
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: 0.077 * D^2.546, with D in cm; output in kg.
Cite: https://treeallometry.org/equations/ounban-2016-teak-agb-d/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Tectona grandis (species), family Lamiaceae; broadleaf
- Where: Plantations across Thailand. Cite: https://treeallometry.org/equations/ounban-2016-teak-agb-d/#where
- Biomes: tropical
- Stand: plantation
- Trees measured: 84. Cite: https://treeallometry.org/equations/ounban-2016-teak-agb-d/#n_trees
- DBH range: 4.4–41.2 cm. Cite: https://treeallometry.org/equations/ounban-2016-teak-agb-d/#dbh
- Height range: 5.5–31 m. Cite: https://treeallometry.org/equations/ounban-2016-teak-agb-d/#height
- R²: 0.978. Cite: https://treeallometry.org/equations/ounban-2016-teak-agb-d/#r2
- Method: Least-squares power regression on untransformed data (weighted data from 12-13 published datasets). Cite: https://treeallometry.org/equations/ounban-2016-teak-agb-d/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/ounban-2016-teak-agb-d/#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

Ounban, W., Puangchit, L., & Diloksumpun, S. (2016). Development of general biomass allometric equations for Tectona grandis Linn.f. and Eucalyptus camaldulensis Dehnh. plantations in Thailand. Agriculture and Natural Resources, 50(1), 48–53.

- DOI: https://doi.org/10.1016/j.anres.2015.08.001
- Access: open access
- Copy we read: https://li01.tci-thaijo.org/index.php/anres/article/download/243871/166492
- Every equation from this source: https://treeallometry.org/sources/ounban-2016/
- Cite: https://treeallometry.org/equations/ounban-2016-teak-agb-d/#source

## The facts, in the source's words

**Equation** (Table 5):

> AGB = 0.077(D)2.546

Cite: https://treeallometry.org/equations/ounban-2016-teak-agb-d/#equation

**Trees measured** (Methods, Compilation of biomass allometric equations):

> 12 datasets with a total of 84 trees were chosen for T. grandis

Cite: https://treeallometry.org/equations/ounban-2016-teak-agb-d/#quote-fit-n-trees

**Smallest DBH** (Methods, Compilation of biomass allometric equations):

> The ranges in the diameters and heights of trees in the dataset were 4.4–41.2 cm and 5.5–31.0 m for T. grandis, and 0.5–19.8 and 1.7–26.0 m for E. camaldulensis

Cite: https://treeallometry.org/equations/ounban-2016-teak-agb-d/#quote-fit-dbh-min-cm

**method** (Methods, Reconstruction of biomass allometric equations):

> Linear regressions of untransformed data were used in the present study because log transformed data introduced a systematic bias

Cite: https://treeallometry.org/equations/ounban-2016-teak-agb-d/#quote-fit-method

**Our note:** General (multi-site) equation fitted on pooled data compiled from published Thai plantation studies (theses, proceedings, reports), not on new felled trees; validated by the authors on independent harvests. D in cm, H in m, output kg dry weight per tree. AGB is the sum of stem, branches and leaves.

## 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 = 15 | 76 | 76 | Computed from the printed form: computed from the published form |
| D = 25 | 279 | 279 | Computed from the printed form: computed from the published form |

Cite: https://treeallometry.org/equations/ounban-2016-teak-agb-d/#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: Ounban, W., Puangchit, L., & Diloksumpun, S. (2016). Development of general biomass allometric equations for Tectona grandis Linn.f. and Eucalyptus camaldulensis Dehnh. plantations in Thailand. Agriculture and Natural Resources, 50(1), 48–53. https://doi.org/10.1016/j.anres.2015.08.001

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Tectona grandis AGB from D", checked 2026-11-02, https://treeallometry.org/equations/ounban-2016-teak-agb-d/. 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/ounban-2016-teak-agb-d.json
Report a problem: email info@restorationscope.com with the equation id (ounban-2016-teak-agb-d) and where the right value appears.