# Pinus caribaea total aboveground biomass, sum of simultaneous component models

Aboveground biomass equation for Pinus caribaea var. hondurensis, Brazil, from Coutinho et al. 2018. 20 trees, DBH 8.2–23.7 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Coutinho et al. 2018 (Table 5):

> bstotal = bsneedles+bsbranches+bstrunk

Cite: https://treeallometry.org/equations/coutinho-2018-total-sur/#equation

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

```
Aboveground biomass = -34.812 + 0.707*D + 0.054*D^2 + 1.461*H + 39.377*rho
```

Inputs: D = Diameter at breast height (1.3 m) (cm); H = Total tree height (m); rho = Wood density (oven-dry mass / green volume) (g/cm³).
The source's own form: -1.943 + 0.160*DBH + 0.087*TH + (8.631 - 1.213*DBH + 0.054*DBH^2) + (-41.5 + 1.760*DBH + 1.374*TH + 39.377*rho), with DBH in cm, TH in m, rho in g/cm3; output in kg.
Cite: https://treeallometry.org/equations/coutinho-2018-total-sur/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Pinus caribaea var. hondurensis (species), family Pinaceae; conifer
- Where: Experimental area of UESB, Vitória da Conquista, Bahia. Cite: https://treeallometry.org/equations/coutinho-2018-total-sur/#where
- Biomes: tropical, subtropical
- Stand: plantation
- Trees measured: 20. Cite: https://treeallometry.org/equations/coutinho-2018-total-sur/#n_trees
- DBH range: 8.2–23.7 cm. Cite: https://treeallometry.org/equations/coutinho-2018-total-sur/#dbh
- Height range: 6.4–14.2 m. Cite: https://treeallometry.org/equations/coutinho-2018-total-sur/#height
- R²: 0.86. Cite: https://treeallometry.org/equations/coutinho-2018-total-sur/#r2
- Method: Simultaneous (SUR) linear regression ensuring additivity; R2 reported is adjusted R2. Cite: https://treeallometry.org/equations/coutinho-2018-total-sur/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/coutinho-2018-total-sur/#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

Coutinho, V. M., Sanquetta, C. R., Bittencourt, P. A., Silva, S. A., Proceke, K. H., Delarrmelina, W. M., & Moreau, J. (2018). Simultaneous Equations to Estimate Aboveground Biomass of Pinus caribaea var. hondurensis. Floresta e Ambiente, 25(3), e20160452.

- DOI: https://doi.org/10.1590/2179-8087.045216
- Access: open access
- Copy we read: http://www.scielo.br/pdf/floram/v25n3/2179-8087-floram-25-3-e20160452.pdf
- Every equation from this source: https://treeallometry.org/sources/coutinho-2018/
- Cite: https://treeallometry.org/equations/coutinho-2018-total-sur/#source

## The facts, in the source's words

**Equation** (Table 5):

> bstotal = bsneedles+bsbranches+bstrunk

Cite: https://treeallometry.org/equations/coutinho-2018-total-sur/#equation

**Trees measured** (Abstract):

> Twenty (20) trees from the experimental area of the State University of Southwest Bahia (UESB), Vitória da Conquista, Bahia, Brazil, were measured and weighed

Cite: https://treeallometry.org/equations/coutinho-2018-total-sur/#quote-fit-n-trees

**Smallest DBH** (Section 3 (Results)):

> with a minimum value of 8.20 cm and a maximum of 23.70 cm; average total height of 11.06 m, ranging from 6.40 m to 14.20 m

Cite: https://treeallometry.org/equations/coutinho-2018-total-sur/#quote-fit-dbh-min-cm

**R²** (Table 5):

> R2adj 0.86

Cite: https://treeallometry.org/equations/coutinho-2018-total-sur/#quote-fit-r2

**Our note:** Ten-year-old plantation, 3 m x 3 m spacing, 20 trees. The paper defines the total as the sum of the three component equations and reports R2adj 0.86 and Syx% 19.93; the expression here is that sum written out, and the canonical form just collects the printed coefficients. Includes needles, branches and trunk, so nothing is excluded.

## 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, H = 9, rho = 0.44 | 11.9 | 11.9 | Computed from the printed form: computed from the published form |
| D = 20, H = 13, rho = 0.5 | 39.6 | 39.6 | Computed from the printed form: computed from the published form |

Cite: https://treeallometry.org/equations/coutinho-2018-total-sur/#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: Coutinho, V. M., Sanquetta, C. R., Bittencourt, P. A., Silva, S. A., Proceke, K. H., Delarrmelina, W. M., & Moreau, J. (2018). Simultaneous Equations to Estimate Aboveground Biomass of Pinus caribaea var. hondurensis. Floresta e Ambiente, 25(3), e20160452. https://doi.org/10.1590/2179-8087.045216

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Pinus caribaea total aboveground biomass, sum of simultaneous component models", checked 2026-11-02, https://treeallometry.org/equations/coutinho-2018-total-sur/. 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/coutinho-2018-total-sur.json
Report a problem: email info@restorationscope.com with the equation id (coutinho-2018-total-sur) and where the right value appears.