# Populus x euramericana root biomass (Table 2)

Root biomass equation for Populus x euramericana, Spain, from Ruiz-Peinado et al. 2012. 8 trees. 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, Populus x euramericana, Roots row):

> Wr = 0.122 · d²

Cite: https://treeallometry.org/equations/ruiz-peinado-2012-populus-euramericana-root/#equation

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

```
Root biomass = 0.122 * D^2
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: 0.122 * d^2, with d in cm; output in kg.
Cite: https://treeallometry.org/equations/ruiz-peinado-2012-populus-euramericana-root/#canonical

## What it covers

- Output: Root biomass, kg
- Taxon: Populus x euramericana (species), family Salicaceae; broadleaf
- Where: Spain (sample zones per species, Figure 1). Cite: https://treeallometry.org/equations/ruiz-peinado-2012-populus-euramericana-root/#where
- Biomes: temperate
- Stand: mixed
- Trees measured: 8. Cite: https://treeallometry.org/equations/ruiz-peinado-2012-populus-euramericana-root/#n_trees
- Method: regression fitted independently of the aboveground system. Cite: https://treeallometry.org/equations/ruiz-peinado-2012-populus-euramericana-root/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/ruiz-peinado-2012-populus-euramericana-root/#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-populus-euramericana-root/#source

## The facts, in the source's words

**Equation** (Table 2, Populus x euramericana, Roots row):

> Wr = 0.122 · d²

Cite: https://treeallometry.org/equations/ruiz-peinado-2012-populus-euramericana-root/#equation

**Trees measured** (Table 1, Populus x euramericana row, root biomass n column):

> Populus x euramericana ... 8

Cite: https://treeallometry.org/equations/ruiz-peinado-2012-populus-euramericana-root/#quote-fit-n-trees

**Our note:** Belowground biomass; fewer trees than aboveground (one tree per diameter class). Table 1 diameter range covers all sample trees, not only the root subset, so no DBH range is set. 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 | 27.5 | 27.5 | Computed from the printed form: computed from the Table 2 coefficients |
| D = 35 | 149.5 | 149.5 | Computed from the printed form: computed from the Table 2 coefficients |

Cite: https://treeallometry.org/equations/ruiz-peinado-2012-populus-euramericana-root/#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), "Populus x euramericana root biomass (Table 2)", checked 2026-11-02, https://treeallometry.org/equations/ruiz-peinado-2012-populus-euramericana-root/. 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-populus-euramericana-root.json
Report a problem: email info@restorationscope.com with the equation id (ruiz-peinado-2012-populus-euramericana-root) and where the right value appears.