# Polylepis sericea AGB from DBH (Tabla 4, power form)

Aboveground biomass equation for Polylepis sericea, Peru, from Ramírez Apolinario & Peláez Peláez 2018. 15 trees, DBH 5–20 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Ramírez Apolinario & Peláez Peláez 2018 (Tabla 4, p. 112 (species name misspelt in the table; exponent printed as superscript)):

> Ploylepis sericea M = 0.1135 DAP2.025

Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-sericea/#equation

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

```
Aboveground biomass = 0.1135 * D^2.025
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: 0.1135 * DAP^2.025, with DAP in cm; output in kg.
Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-sericea/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Polylepis sericea (species), family Rosaceae; broadleaf
- Where: Poccrac, Ticapampa district (Recuay), Áncash, Peru; native high-Andean Polylepis forest. Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-sericea/#where
- Biomes: tropical, montane
- Stand: natural
- Trees measured: 15. Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-sericea/#n_trees
- DBH range: 5–20 cm. Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-sericea/#dbh
- R²: 0.941. Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-sericea/#r2
- Method: OLS on ln(M) vs ln(DAP) in SPSS 22, back-transformed without correction factor. Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-sericea/#method
- Verification: read in the original source
- Last checked: 2026-11-01. Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-sericea/#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

Ramírez Apolinario, E., & Peláez Peláez, F. (2018). Modelo alométrico para estimar el potencial de captura de carbono en Polylepis spp en Poccrac, Ancash 2016. Revista de Investigación de la Universidad Le Cordon Bleu, 5(1), 105–115.

- Link: https://revistas.ulcb.edu.pe/index.php/REVISTAULCB/article/view/100
- Access: open access
- Copy we read: https://revistas.ulcb.edu.pe/index.php/REVISTAULCB/article/download/100/243
- Every equation from this source: https://treeallometry.org/sources/ramirez-pelaez-2018/
- Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-sericea/#source

## The facts, in the source's words

**Equation** (Tabla 4, p. 112 (species name misspelt in the table; exponent printed as superscript)):

> Ploylepis sericea M = 0.1135 DAP2.025

Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-sericea/#equation

**Equation** (Tabla 4, p. 112):

> Ln(M) = -2.1757+ 2.025 Ln(DAP)

Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-sericea/#quote-expression

**R²** (Tabla 3, p. 112):

> Polylepis sericea -2.1757 2,0250 15 0,970 0,941 0,934 0,041

Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-sericea/#quote-fit-r2

**Smallest DBH** (Resumen, p. 105):

> La medida del DAP de los árboles de Polylepis seleccionados están dentro del rango que va desde 5 cm a 20cm.

Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-sericea/#quote-fit-dbh-min-cm

**Our note:** M is aboveground biomass in kg. Trees were air-dried in shade to constant weight, not oven-dried. Harvested trees in Tabla 2 span DAP 5,8–18,0 cm. No log-bias correction factor applied by the authors.

## 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 = 12 | 17.4 | 17.4 | Computed from the printed form: computed from the published power form; Tabla 2 tree 2 (DAP 12,0 cm) weighed 17,0 kg |
| D = 18 | 39.5 | 39.5 | Computed from the printed form: computed from the published power form |

Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-sericea/#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: Ramírez Apolinario, E., & Peláez Peláez, F. (2018). Modelo alométrico para estimar el potencial de captura de carbono en Polylepis spp en Poccrac, Ancash 2016. Revista de Investigación de la Universidad Le Cordon Bleu, 5(1), 105–115.

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Polylepis sericea AGB from DBH (Tabla 4, power form)", checked 2026-11-01, https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-sericea/. 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/ramirez-pelaez-2018-polylepis-sericea.json
Report a problem: email info@restorationscope.com with the equation id (ramirez-pelaez-2018-polylepis-sericea) and where the right value appears.