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

Aboveground biomass equation for Polylepis incana, 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 (exponent printed as superscript)):

> Polylepis incana M = 0,118 DAP2.0078

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

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

```
Aboveground biomass = 0.118 * D^2.0078
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: 0.118 * DAP^2.0078, with DAP in cm; output in kg.
Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-incana/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Polylepis incana (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-incana/#where
- Biomes: tropical, montane
- Stand: natural
- Trees measured: 15. Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-incana/#n_trees
- DBH range: 5–20 cm. Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-incana/#dbh
- R²: 0.936. Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-incana/#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-incana/#method
- Verification: read in the original source
- Last checked: 2026-11-01. Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-incana/#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-incana/#source

## The facts, in the source's words

**Equation** (Tabla 4, p. 112 (exponent printed as superscript)):

> Polylepis incana M = 0,118 DAP2.0078

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

**R²** (Tabla 3, p. 112 (LNB, A, N, r, r², r² corregido, error tipo residual)):

> Polylepis incana -2,137 2,0078 15 0,968 0,936 0,929 0,043

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

**Trees measured** (Resumen, p. 105):

> han sido diseñadas a partir de 15 datos

Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-incana/#quote-fit-n-trees

**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-incana/#quote-fit-dbh-min-cm

**Our note:** M is aboveground biomass in kg (Tabla 1 header 'M (Kg)'). Trees were air-dried in shade to constant weight (about 8 weeks), not oven-dried, so 'dry' mass may be slightly high. The linear form in Tabla 4 prints 'Ln(M) = -2,371 + 2,0078Ln(DAP)', which conflicts with Tabla 3 (LNB = -2,137) and with 0,118 = exp(-2,137); the power form is used here. The harvested trees in Tabla 1 span DAP 6,0–18,0 cm; 5–20 cm is the range the authors state. No log-bias correction factor applied by the authors. Same data republished in Rev. Tayacaja 1(1):17-27 (2018).

## 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 = 11.2 | 15.1 | 15.1 | Computed from the printed form: computed from the published power form; Tabla 1 tree 1 (DAP 11,2 cm) weighed 16,5 kg |
| D = 18 | 39.1 | 39.1 | Computed from the printed form: computed from the published power form |

Cite: https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-incana/#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 incana AGB from DBH (Tabla 4, power form)", checked 2026-11-01, https://treeallometry.org/equations/ramirez-pelaez-2018-polylepis-incana/. 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-incana.json
Report a problem: email info@restorationscope.com with the equation id (ramirez-pelaez-2018-polylepis-incana) and where the right value appears.