# Total aboveground biomass, Tecoma stans var. stans, dap only

Aboveground biomass equation for Tecoma stans var. stans, Peru, from Begazo Curie & Jave Nakayo 2018. 15 trees, DBH 3.8–19.1 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Begazo Curie & Jave Nakayo 2018 (Cuadro 9 / Resumen / Conclusiones):

> Ln ( BT ) = -2.9409 + 2.6925 × Ln (dap)

Cite: https://treeallometry.org/equations/begazo-2018-tecoma/#equation

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

```
Aboveground biomass = exp(-2.9409 + 2.6925 * ln(D))
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: exp(-2.9409 + 2.6925 * ln(dap)), with dap in cm; output in kg.
Cite: https://treeallometry.org/equations/begazo-2018-tecoma/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Tecoma stans var. stans (species), family Bignoniaceae; broadleaf
- Where: Bosque simulado y Plantación forestal, UNALM, La Molina, Lima (238 m a.s.l.). Cite: https://treeallometry.org/equations/begazo-2018-tecoma/#where
- Biomes: dryland
- Stand: plantation
- Trees measured: 15. Cite: https://treeallometry.org/equations/begazo-2018-tecoma/#n_trees
- DBH range: 3.8–19.1 cm. Cite: https://treeallometry.org/equations/begazo-2018-tecoma/#dbh
- Height range: 4.4–11.8 m. Cite: https://treeallometry.org/equations/begazo-2018-tecoma/#height
- R²: 0.93. Cite: https://treeallometry.org/equations/begazo-2018-tecoma/#r2
- Method: linearised regression on Ln(B), no back-transform correction stated. Cite: https://treeallometry.org/equations/begazo-2018-tecoma/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/begazo-2018-tecoma/#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

Begazo Curie, K., & Jave Nakayo, J. (2018). Estimación de la biomasa aérea total y por componente estructural en especies arbóreas de Lima, Perú. Revista Forestal del Perú, 33(1), 76–90.

- DOI: https://doi.org/10.21704/rfp.v33i1.1167
- Access: open access
- Copy we read: https://revistas.lamolina.edu.pe/index.php/rfp/article/view/1167
- Every equation from this source: https://treeallometry.org/sources/begazo-2018/
- Cite: https://treeallometry.org/equations/begazo-2018-tecoma/#source

## The facts, in the source's words

**Equation** (Cuadro 9 / Resumen / Conclusiones):

> Ln ( BT ) = -2.9409 + 2.6925 × Ln (dap)

Cite: https://treeallometry.org/equations/begazo-2018-tecoma/#equation

**Trees measured** (Resumen):

> se evaluaron 44 individuos en total: 15 individuos de la especie Tecoma stans (L.) Juss. ex Kunth var. stans, 15 individuos para Grevillea robusta A. Cunn. ex R. Br, y 14 individuos para Schinus molle L.

Cite: https://treeallometry.org/equations/begazo-2018-tecoma/#quote-fit-n-trees

**Our note:** Ln is natural log as printed; the Discusión notes that back-transformed log models underestimate but gives no correction factor, so none is applied. Biomass is oven-dry (103 °C) total aboveground (stem + branches + leaves), kg/tree; dap in cm, ht (total height) in m. DBH and height ranges are from Cuadro 2 (descriptive statistics of the sampled trees). Trees from a managed plantation at 2 x 2 m spacing, used to inform urban green areas. Cuadro 9 prints the slope as 2.6935; the abstract, results text and conclusions print 2.6925, which is used here.

## 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 = 8 | 14.3 | 14.3 | Computed from the printed form: hand-computed from the published form |
| D = 15 | 77.5 | 77.5 | Computed from the printed form: hand-computed from the published form |

Cite: https://treeallometry.org/equations/begazo-2018-tecoma/#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: Begazo Curie, K., & Jave Nakayo, J. (2018). Estimación de la biomasa aérea total y por componente estructural en especies arbóreas de Lima, Perú. Revista Forestal del Perú, 33(1), 76–90. https://doi.org/10.21704/rfp.v33i1.1167

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Total aboveground biomass, Tecoma stans var. stans, dap only", checked 2026-11-02, https://treeallometry.org/equations/begazo-2018-tecoma/. 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/begazo-2018-tecoma.json
Report a problem: email info@restorationscope.com with the equation id (begazo-2018-tecoma) and where the right value appears.