# Pinus patula total aboveground biomass from DBH (Tlaxco, Tlaxcala)

Aboveground biomass equation for Pinus patula Schl. et Cham., Mexico, from Díaz-Franco et al. 2007. 25 trees, DBH 6.7–64.1 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Díaz-Franco et al. 2007 (Resultados, Estimación de biomasa, p. 29):

> B = 0,0357 * DN2.6916

Cite: https://treeallometry.org/equations/diaz-franco-2007-pinus-patula-agb/#equation

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

```
Aboveground biomass = 0.0357 * D^2.6916
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: 0.0357 * DN^2.6916, with DN in cm; output in kg.
Cite: https://treeallometry.org/equations/diaz-franco-2007-pinus-patula-agb/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Pinus patula Schl. et Cham. (species), family Pinaceae; conifer
- Where: Ejido Mariano de Matamoros, Tlaxco, Tlaxcala. Cite: https://treeallometry.org/equations/diaz-franco-2007-pinus-patula-agb/#where
- Biomes: temperate, montane
- Stand: natural
- Trees measured: 25. Cite: https://treeallometry.org/equations/diaz-franco-2007-pinus-patula-agb/#n_trees
- DBH range: 6.7–64.1 cm. Cite: https://treeallometry.org/equations/diaz-franco-2007-pinus-patula-agb/#dbh
- R²: 0.98. Cite: https://treeallometry.org/equations/diaz-franco-2007-pinus-patula-agb/#r2
- Method: power model Y = b*X^k fitted to total aboveground dry biomass (stem, branches, foliage); no correction factor stated. Cite: https://treeallometry.org/equations/diaz-franco-2007-pinus-patula-agb/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/diaz-franco-2007-pinus-patula-agb/#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

Díaz-Franco, R., Acosta-Mireles, M., Carrillo-Anzures, F., Buendía-Rodríguez, E., Flores-Ayala, E., & Etchevers-Barra, J. D. (2007). Determinación de ecuaciones alométricas para estimar biomasa y carbono en Pinus patula Schl. et Cham. Madera y Bosques, 13(1), 25-34.

- DOI: https://doi.org/10.21829/myb.2007.1311233
- Access: open access
- Copy we read: http://myb.ojs.inecol.mx/index.php/myb/article/download/1233/1403
- Every equation from this source: https://treeallometry.org/sources/diaz-franco-2007/
- Cite: https://treeallometry.org/equations/diaz-franco-2007-pinus-patula-agb/#source

## The facts, in the source's words

**Equation** (Resultados, Estimación de biomasa, p. 29):

> B = 0,0357 * DN2.6916

Cite: https://treeallometry.org/equations/diaz-franco-2007-pinus-patula-agb/#equation

**model form** (Materiales y Métodos, p. 28):

> Y = b * Xk (1) ... donde Y es la biomasa aérea (kg), X es el DN (cm)

Cite: https://treeallometry.org/equations/diaz-franco-2007-pinus-patula-agb/#quote-model-form

**Trees measured** (Materiales y Métodos, p. 27):

> Se seleccionaron 25 árboles de P. patula

Cite: https://treeallometry.org/equations/diaz-franco-2007-pinus-patula-agb/#quote-fit-n-trees

**dbh range** (Resultados, p. 29):

> El DN de los árboles muestreados varió en un rango de 6,7 a 64,1 cm

Cite: https://treeallometry.org/equations/diaz-franco-2007-pinus-patula-agb/#quote-fit-dbh-range

**R²** (Resultados, p. 29):

> coeficiente de determinación alto (R2 =0,98)

Cite: https://treeallometry.org/equations/diaz-franco-2007-pinus-patula-agb/#quote-fit-r2

**Our note:** Tabla 2 prints predicted total biomass at DN 5-65 cm; four rows reproduce within rounding. Decimal comma in the original. Biomass includes stem (stump cubed as a truncated cone), branches and foliage. The paper does not say whether the stand is natural or planted: trees came from a stand under forest management (aprovechamiento), recorded here as natural. The paper also prints a carbon equation (CC = 0,021 * DN 2.6451), not stored because it is not a biomass equation.

## 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 | 17.6 | 17.5 | Value printed in the paper: Tabla 2, columna 'Presente estudio' (biomasa total, kg), p. 31 |
| D = 20 | 113 | 113 | Value printed in the paper: Tabla 2, columna 'Presente estudio' (biomasa total, kg), p. 31 |
| D = 50 | 1,335 | 1,335 | Value printed in the paper: Tabla 2, columna 'Presente estudio' (biomasa total, kg), p. 31 |
| D = 65 | 2,706 | 2,706 | Value printed in the paper: Tabla 2, columna 'Presente estudio' (biomasa total, kg), p. 31 |

Cite: https://treeallometry.org/equations/diaz-franco-2007-pinus-patula-agb/#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: Díaz-Franco, R., Acosta-Mireles, M., Carrillo-Anzures, F., Buendía-Rodríguez, E., Flores-Ayala, E., & Etchevers-Barra, J. D. (2007). Determinación de ecuaciones alométricas para estimar biomasa y carbono en Pinus patula Schl. et Cham. Madera y Bosques, 13(1), 25-34. https://doi.org/10.21829/myb.2007.1311233

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Pinus patula total aboveground biomass from DBH (Tlaxco, Tlaxcala)", checked 2026-11-02, https://treeallometry.org/equations/diaz-franco-2007-pinus-patula-agb/. 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/diaz-franco-2007-pinus-patula-agb.json
Report a problem: email info@restorationscope.com with the equation id (diaz-franco-2007-pinus-patula-agb) and where the right value appears.