# Trees on farms in western Kenya, DBH only

Aboveground biomass equation for Trees on farms, mixed species (agricultural landscape), Kenya, from Kuyah et al. 2012. 72 trees, DBH 2.5–102 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

**From a secondary source, not the original:** we could only read this equation in https://doi.org/10.1007/s10457-014-9747-9 (another paper, brief or compilation). Check it against the original before relying on it.

## Equation

As printed in Kuyah et al. 2012 (Kuyah & Rosenstock 2015, Methods / Table 1):

> (equation 3, AGB = 0.091 × DBH^2.472)

Cite: https://treeallometry.org/equations/kuyah-2012-dbh/#equation

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

```
Aboveground biomass = 0.091 * D^2.472
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: 0.091 * DBH^2.472, with DBH in cm; output in kg.
Cite: https://treeallometry.org/equations/kuyah-2012-dbh/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Trees on farms, mixed species (agricultural landscape) (mixed species); broadleaf
- Where: Yala River basin, western Kenya. Cite: https://treeallometry.org/equations/kuyah-2012-dbh/#where
- Biomes: tropical
- Stand: agroforestry
- Trees measured: 72. Cite: https://treeallometry.org/equations/kuyah-2012-dbh/#n_trees
- DBH range: 2.5–102 cm. Cite: https://treeallometry.org/equations/kuyah-2012-dbh/#dbh
- R²: 0.977. Cite: https://treeallometry.org/equations/kuyah-2012-dbh/#r2
- Method: power model (coefficients as in Kuyah et al. 2012a). Cite: https://treeallometry.org/equations/kuyah-2012-dbh/#method
- Verification: from a secondary source (https://doi.org/10.1007/s10457-014-9747-9)
- Last checked: 2026-11-01. Cite: https://treeallometry.org/equations/kuyah-2012-dbh/#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

Kuyah, S., Dietz, J., Muthuri, C., Jamnadass, R., Mwangi, P., Coe, R., Neufeldt, H. (2012). Allometric equations for estimating biomass in agricultural landscapes: I. Aboveground biomass. Agriculture, Ecosystems & Environment, 158, 216–224.

- DOI: https://doi.org/10.1016/j.agee.2012.05.011
- Access: paywalled
- Every equation from this source: https://treeallometry.org/sources/kuyah-2012/
- Cite: https://treeallometry.org/equations/kuyah-2012-dbh/#source

## The facts, in the source's words

**Equation** (Kuyah & Rosenstock 2015, Methods / Table 1):

> (equation 3, AGB = 0.091 × DBH^2.472)

Cite: https://treeallometry.org/equations/kuyah-2012-dbh/#equation

**Trees measured** (Kuyah & Rosenstock 2015, Methods):

> 72

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

**Our note:** Fitted by Kuyah et al. 2012 (not read: paywalled). Read from Kuyah & Rosenstock 2015, which restates it as equation 3. That text does not say whether a log back-transform correction is folded into 0.091; output assumed kg, DBH in cm.

## 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 = 20 | 150 | 150 | Computed from the printed form: hand-computed from the published form |
| D = 50 | 1,442 | 1,442 | Computed from the printed form: hand-computed from the published form |

Cite: https://treeallometry.org/equations/kuyah-2012-dbh/#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: Kuyah, S., Dietz, J., Muthuri, C., Jamnadass, R., Mwangi, P., Coe, R., Neufeldt, H. (2012). Allometric equations for estimating biomass in agricultural landscapes: I. Aboveground biomass. Agriculture, Ecosystems & Environment, 158, 216–224. https://doi.org/10.1016/j.agee.2012.05.011

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Trees on farms in western Kenya, DBH only", checked 2026-11-01, https://treeallometry.org/equations/kuyah-2012-dbh/. 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/kuyah-2012-dbh.json
Report a problem: email info@restorationscope.com with the equation id (kuyah-2012-dbh) and where the right value appears.