# Pan moist tropical AGB from D²H (Table 4, model 3)

Aboveground biomass equation for Mixed species, pan moist tropical forests (Campo-Ma'an plus data from Asia and South America), Pantropical, from Djomo et al. 2010. 274 trees, DBH 1–138 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Djomo et al. 2010 (Table 4, model 3):

> 3. ln(M) = a + b ln(D2 H)   a = −3.2249  b = 0.9885

Cite: https://treeallometry.org/equations/djomo-2010-pan-d2h/#equation

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

```
Aboveground biomass = exp(-3.2249 + 0.9885 * ln(D^2 * H))
```

Inputs: D = Diameter at breast height (1.3 m) (cm); H = Total tree height (m).
The source's own form: exp(-3.2249 + 0.9885 * ln(D^2 * H)), with D in cm, H in m; output in kg.
Cite: https://treeallometry.org/equations/djomo-2010-pan-d2h/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Mixed species, pan moist tropical forests (Campo-Ma'an plus data from Asia and South America) (mixed species); broadleaf
- Where: Moist tropical forests; Campo-Ma'an Cameroon, Brazil (Pará, Central Amazon), Indonesia. Cite: https://treeallometry.org/equations/djomo-2010-pan-d2h/#where
- Biomes: tropical
- Stand: natural
- Trees measured: 274. Cite: https://treeallometry.org/equations/djomo-2010-pan-d2h/#n_trees
- DBH range: 1–138 cm. Cite: https://treeallometry.org/equations/djomo-2010-pan-d2h/#dbh
- R²: 0.971. Cite: https://treeallometry.org/equations/djomo-2010-pan-d2h/#r2
- Residual SE: 0.443. Cite: https://treeallometry.org/equations/djomo-2010-pan-d2h/#rse
- Method: log-log regression. Cite: https://treeallometry.org/equations/djomo-2010-pan-d2h/#method
- Verification: read in the original source
- Last checked: 2026-11-01. Cite: https://treeallometry.org/equations/djomo-2010-pan-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

Djomo, A.N., Ibrahima, A., Saborowski, J., Gravenhorst, G. (2010). Allometric equations for biomass estimations in Cameroon and pan moist tropical equations including biomass data from Africa. Forest Ecology and Management, 260(10), 1873–1885.

- DOI: https://doi.org/10.1016/j.foreco.2010.08.034
- Access: paywalled
- Copy we read: https://uni-goettingen.de/de/document/download/4df40c701547ab5773871feade802dc2.pdf/Djomo_et_al_(2010)_FORECOLMANAG_allometric_equations.pdf
- Every equation from this source: https://treeallometry.org/sources/djomo-2010/
- Cite: https://treeallometry.org/equations/djomo-2010-pan-d2h/#source

## The facts, in the source's words

**Equation** (Table 4, model 3):

> 3. ln(M) = a + b ln(D2 H)   a = −3.2249  b = 0.9885

Cite: https://treeallometry.org/equations/djomo-2010-pan-d2h/#equation

**Trees measured** (Table 4, model 3):

> N 274, RSE 0.443, Adj. R2 0.9710, D range 1–138

Cite: https://treeallometry.org/equations/djomo-2010-pan-d2h/#quote-fit-n-trees

**Our note:** Pooled pan moist tropical data set (see pan-d). Coefficients are used as printed; the paper does not state that the log-scale back-transformation correction factor is included, so none is applied. Reported R² is the adjusted R². Equation chosen from the paper's recommended set (7 of its equations captured).

## 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 = 30, H = 25 | 797 | 797 | Computed from the printed form: hand-computed from the published form |

Cite: https://treeallometry.org/equations/djomo-2010-pan-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: Djomo, A.N., Ibrahima, A., Saborowski, J., Gravenhorst, G. (2010). Allometric equations for biomass estimations in Cameroon and pan moist tropical equations including biomass data from Africa. Forest Ecology and Management, 260(10), 1873–1885. https://doi.org/10.1016/j.foreco.2010.08.034

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Pan moist tropical AGB from D²H (Table 4, model 3)", checked 2026-11-01, https://treeallometry.org/equations/djomo-2010-pan-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/djomo-2010-pan-d2h.json
Report a problem: email info@restorationscope.com with the equation id (djomo-2010-pan-d2h) and where the right value appears.