# Quercus faginea stem with bark biomass (Table 2)

Stem biomass equation for Quercus faginea, Spain, from Ruiz-Peinado et al. 2012. 24 trees, DBH 9.5–46.5 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Ruiz-Peinado et al. 2012 (Table 2, Quercus faginea, Stem row):

> Ws = 0.154 · d²

Cite: https://treeallometry.org/equations/ruiz-peinado-2012-quercus-faginea-stem/#equation

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

```
Stem biomass = 0.154 * D^2
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: 0.154 * d^2, with d in cm; output in kg.
Cite: https://treeallometry.org/equations/ruiz-peinado-2012-quercus-faginea-stem/#canonical

## What it covers

- Output: Stem biomass, kg
- Taxon: Quercus faginea (species), family Fagaceae; broadleaf
- Where: Spain (sample zones per species, Figure 1). Cite: https://treeallometry.org/equations/ruiz-peinado-2012-quercus-faginea-stem/#where
- Biomes: temperate
- Stand: mixed
- Trees measured: 24. Cite: https://treeallometry.org/equations/ruiz-peinado-2012-quercus-faginea-stem/#n_trees
- DBH range: 9.5–46.5 cm. Cite: https://treeallometry.org/equations/ruiz-peinado-2012-quercus-faginea-stem/#dbh
- Height range: 4.9–14.7 m. Cite: https://treeallometry.org/equations/ruiz-peinado-2012-quercus-faginea-stem/#height
- Method: seemingly unrelated regression with weighting. Cite: https://treeallometry.org/equations/ruiz-peinado-2012-quercus-faginea-stem/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/ruiz-peinado-2012-quercus-faginea-stem/#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

Ruiz-Peinado, R., Montero, G., & del Rio, M. (2012). Biomass models to estimate carbon stocks for hardwood tree species. Forest Systems, 21(1), 42-52.

- DOI: https://doi.org/10.5424/fs/2112211-02193
- Access: open access
- Copy we read: https://fs.revistas.csic.es/index.php/fs/article/download/2193/1635
- Every equation from this source: https://treeallometry.org/sources/ruiz-peinado-2012/
- Cite: https://treeallometry.org/equations/ruiz-peinado-2012-quercus-faginea-stem/#source

## The facts, in the source's words

**Equation** (Table 2, Quercus faginea, Stem row):

> Ws = 0.154 · d²

Cite: https://treeallometry.org/equations/ruiz-peinado-2012-quercus-faginea-stem/#equation

**Trees measured** (Table 1, Quercus faginea row, aboveground biomass n column):

> Quercus faginea ... 24

Cite: https://treeallometry.org/equations/ruiz-peinado-2012-quercus-faginea-stem/#quote-fit-n-trees

**Smallest DBH** (Table 1, diameter min/max (all sample trees of the species)):

> Quercus faginea 9.5 46.5

Cite: https://treeallometry.org/equations/ruiz-peinado-2012-quercus-faginea-stem/#quote-fit-dbh-min-cm

**Our note:** Stem with bark (commercial volume, up to a top diameter of 7 cm); fitted jointly with the branch equations by SUR to keep components additive. Stand type is not stated per species in the paper. Branch equations for this species are not added.

## 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 | 34.7 | 34.7 | Computed from the printed form: computed from the Table 2 coefficients |
| D = 35 | 189 | 189 | Computed from the printed form: computed from the Table 2 coefficients |

Cite: https://treeallometry.org/equations/ruiz-peinado-2012-quercus-faginea-stem/#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: Ruiz-Peinado, R., Montero, G., & del Rio, M. (2012). Biomass models to estimate carbon stocks for hardwood tree species. Forest Systems, 21(1), 42-52. https://doi.org/10.5424/fs/2112211-02193

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Quercus faginea stem with bark biomass (Table 2)", checked 2026-11-02, https://treeallometry.org/equations/ruiz-peinado-2012-quercus-faginea-stem/. 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/ruiz-peinado-2012-quercus-faginea-stem.json
Report a problem: email info@restorationscope.com with the equation id (ruiz-peinado-2012-quercus-faginea-stem) and where the right value appears.