# Tectona grandis (teak), 20-year-old Panama plantations, total tree biomass incl. roots

Total biomass equation for Tectona grandis, Panama, from Kraenzel 2000. 9 trees, DBH 16.9–43.8 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Kraenzel 2000 (Figure 4, equation 1 (thesis p. 55)):

> Log Tree B = 2.575(log DBH) - 1.042

Cite: https://treeallometry.org/equations/kraenzel-2000-tectona-grandis-total/#equation

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

```
Total biomass = 10^(2.575 * log10(D) - 1.042)
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: 10^(2.575 * log10(DBH) - 1.042), with DBH in cm; output in kg.
Cite: https://treeallometry.org/equations/kraenzel-2000-tectona-grandis-total/#canonical

## What it covers

- Output: Total biomass, kg
- Taxon: Tectona grandis (species), family Lamiaceae; broadleaf
- Where: Four harvest-age (about 20-year) teak plantations in Panama (Boquerón, Peñas Blancas, Tranquilla, Aguas Claras). Cite: https://treeallometry.org/equations/kraenzel-2000-tectona-grandis-total/#where
- Biomes: tropical
- Stand: plantation
- Trees measured: 9. Cite: https://treeallometry.org/equations/kraenzel-2000-tectona-grandis-total/#n_trees
- DBH range: 16.9–43.8 cm. Cite: https://treeallometry.org/equations/kraenzel-2000-tectona-grandis-total/#dbh
- R²: 0.9778. Cite: https://treeallometry.org/equations/kraenzel-2000-tectona-grandis-total/#r2
- Residual SE: 0.056. Cite: https://treeallometry.org/equations/kraenzel-2000-tectona-grandis-total/#rse
- Method: OLS on log10(tree biomass) vs log10(DBH); no correction factor reported. Cite: https://treeallometry.org/equations/kraenzel-2000-tectona-grandis-total/#method
- Verification: read in the original source
- Last checked: 2026-11-01. Cite: https://treeallometry.org/equations/kraenzel-2000-tectona-grandis-total/#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

Kraenzel, M. B. (2000). Carbon storage of Panamanian harvest-age teak (Tectona grandis) plantations. MSc thesis, Department of Biology, McGill University, Montréal.

- Link: https://mcgill.scholaris.ca/bitstreams/ef6d70e9-7d9b-4a0a-89a4-7465e980bc99/download
- Access: open access
- Every equation from this source: https://treeallometry.org/sources/kraenzel-2000/
- Cite: https://treeallometry.org/equations/kraenzel-2000-tectona-grandis-total/#source

## The facts, in the source's words

**Equation** (Figure 4, equation 1 (thesis p. 55)):

> Log Tree B = 2.575(log DBH) - 1.042

Cite: https://treeallometry.org/equations/kraenzel-2000-tectona-grandis-total/#equation

**R²** (Figure 4):

> r2 = 0.9778, SEE = 0.056 (equation 1)

Cite: https://treeallometry.org/equations/kraenzel-2000-tectona-grandis-total/#quote-fit-r2

**Smallest DBH** (Results, tree biomass section):

> diameter at breast height of the nine excavated trees ranged between 16.9 and 43.8 cm

Cite: https://treeallometry.org/equations/kraenzel-2000-tectona-grandis-total/#quote-fit-dbh-min-cm

**Output** (Table 3 (tree totals include coarse and fine roots)):

> Coarse Roots 14.2 31.4 28.8

Cite: https://treeallometry.org/equations/kraenzel-2000-tectona-grandis-total/#quote-output-quantity

**Our note:** Tree biomass B (kg dry mass) is the whole tree including excavated coarse and fine roots (Table 3 totals), so this is total above + below biomass; mean root:shoot ratio 0.157. log is base 10. SEE is on the log10 scale. Thesis precursor of Kraenzel et al. (2003) Forest Ecology and Management 173:213–225 (paywalled, not read); coefficients there may differ.

## 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 = 16.9 | 132 | 132 | Computed from the printed form: computed from the published form at the smallest sampled DBH (observed totals ranged 122.1–1365.0 kg) |
| D = 43.8 | 1,530 | 1,530 | Computed from the printed form: computed from the published form at the largest sampled DBH |

Cite: https://treeallometry.org/equations/kraenzel-2000-tectona-grandis-total/#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: Kraenzel, M. B. (2000). Carbon storage of Panamanian harvest-age teak (Tectona grandis) plantations. MSc thesis, Department of Biology, McGill University, Montréal.

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Tectona grandis (teak), 20-year-old Panama plantations, total tree biomass incl. roots", checked 2026-11-01, https://treeallometry.org/equations/kraenzel-2000-tectona-grandis-total/. 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/kraenzel-2000-tectona-grandis-total.json
Report a problem: email info@restorationscope.com with the equation id (kraenzel-2000-tectona-grandis-total) and where the right value appears.