# Buddleja coriacea (colle) AGB per stem from diameter at 30 cm and height (sum of SUR components)

Aboveground biomass equation for Buddleja coriacea, Ecuador, from Riofrío et al. 2013. 13 trees. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Riofrío et al. 2013 (Tabla 4, Colle, Ramas gruesas):

> W rg = 0,01489*d2 *Ht

Cite: https://treeallometry.org/equations/riofrio-2013-buddleja-coriacea/#equation

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

```
Aboveground biomass = 0.025016 * D30^2 * H
```

Inputs: D30 = Stem diameter at 30 cm (cm); H = Total tree height (m).
The source's own form: 0.01489*d^2*Ht + 0.006169*d^2*Ht + 0.003957*d^2*Ht, with d in cm, Ht in m; output in kg.
Cite: https://treeallometry.org/equations/riofrio-2013-buddleja-coriacea/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Buddleja coriacea (species), family Scrophulariaceae; shrub
- Where: Two INIAP agroforestry systems, inter-Andean western cordillera of northern/central Ecuador, above 3000 m (Bosque Siempreverde Montano Alto). Cite: https://treeallometry.org/equations/riofrio-2013-buddleja-coriacea/#where
- Biomes: tropical, montane
- Stand: agroforestry
- Trees measured: 13. Cite: https://treeallometry.org/equations/riofrio-2013-buddleja-coriacea/#n_trees
- Height range: 3.1–5.1 m. Cite: https://treeallometry.org/equations/riofrio-2013-buddleja-coriacea/#height
- R²: 0.925. Cite: https://treeallometry.org/equations/riofrio-2013-buddleja-coriacea/#r2
- Method: Component models (coarse branches >2 cm, thin branches, leaves) fitted by SUR; total = sum of components. Cite: https://treeallometry.org/equations/riofrio-2013-buddleja-coriacea/#method
- Verification: read in the original source
- Last checked: 2026-11-01. Cite: https://treeallometry.org/equations/riofrio-2013-buddleja-coriacea/#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

Riofrío, J., Herrero de Aza, C., Grijalva, J., & Bravo, F. (2013). Modelos para estimar la biomasa de especies forestales en sistemas agroforestales de la ecorregión andina del Ecuador. 6º Congreso Forestal Español, Vitoria-Gasteiz, Spain. Paper 6CFE01-023.

- Link: https://www.congresoforestal.es/actas/doc/6CFE/6CFE01-023.pdf
- Access: open access
- Every equation from this source: https://treeallometry.org/sources/riofrio-2013/
- Cite: https://treeallometry.org/equations/riofrio-2013-buddleja-coriacea/#source

## The facts, in the source's words

**Equation** (Tabla 4, Colle, Ramas gruesas):

> W rg = 0,01489*d2 *Ht

Cite: https://treeallometry.org/equations/riofrio-2013-buddleja-coriacea/#equation

**Equation** (Tabla 4, Colle, Ramas delgadas):

> W rd = 0,006169*d2 *Ht

Cite: https://treeallometry.org/equations/riofrio-2013-buddleja-coriacea/#quote-expression

**Equation** (Tabla 4, Colle, Hojas):

> W h = 0,003957 *d2 *Ht

Cite: https://treeallometry.org/equations/riofrio-2013-buddleja-coriacea/#quote-expression-2

**R²** (Tabla 4, Colle (RMSE kg, R2 ajustado)):

> Biomasa total 2,09 0,925

Cite: https://treeallometry.org/equations/riofrio-2013-buddleja-coriacea/#quote-fit-r2

**Note** (Metodología, Datos):

> sólo se seleccionó una rama por individuo para el muestreo destructivo, considerándose a cada muestra como un individuo diferente

Cite: https://treeallometry.org/equations/riofrio-2013-buddleja-coriacea/#quote-notes

**Trees measured** (Tabla 1 (* = diameter at 30 cm above ground)):

> Colle 13 11,1* 2,2 8,6 15,6 4,2 0,6 3,1 5,1

Cite: https://treeallometry.org/equations/riofrio-2013-buddleja-coriacea/#quote-fit-n-trees

**Our note:** Multi-stemmed shrub (3–7 stems from the base): each sampled stem was treated as one individual, so the model gives biomass per stem; sum over stems for a plant. D30 = stem diameter 30 cm above ground (fitted range 8,6–15,6 cm). Total is the sum of the three Tabla 4 component equations.

## 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 |
| --- | --- | --- | --- |
| D30 = 11.1, H = 4.2 | 12.9 | 12.9 | Computed from the printed form: computed at the sample means (observed mean Wt 13,8 kg, Tabla 1) |
| D30 = 15, H = 5 | 28.1 | 28.1 | Computed from the printed form: computed from the sum of published components |

Cite: https://treeallometry.org/equations/riofrio-2013-buddleja-coriacea/#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: Riofrío, J., Herrero de Aza, C., Grijalva, J., & Bravo, F. (2013). Modelos para estimar la biomasa de especies forestales en sistemas agroforestales de la ecorregión andina del Ecuador. 6º Congreso Forestal Español, Vitoria-Gasteiz, Spain. Paper 6CFE01-023.

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Buddleja coriacea (colle) AGB per stem from diameter at 30 cm and height (sum of SUR components)", checked 2026-11-01, https://treeallometry.org/equations/riofrio-2013-buddleja-coriacea/. 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/riofrio-2013-buddleja-coriacea.json
Report a problem: email info@restorationscope.com with the equation id (riofrio-2013-buddleja-coriacea) and where the right value appears.