# Pinus caribaea needle biomass from DBH and height (simultaneous fit)

Foliage 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):

> bsneedles = β0+β1DBH+β2TH: -1.943, 0.160, 0.087

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

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

```
Foliage biomass = -1.943 + 0.160*D + 0.087*H
```

Inputs: D = Diameter at breast height (1.3 m) (cm); H = Total tree height (m).
The source's own form: -1.943 + 0.160*DBH + 0.087*TH, with DBH in cm, TH in m; output in kg.
Cite: https://treeallometry.org/equations/coutinho-2018-needles-sur/#canonical

## What it covers

- Output: Foliage 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-needles-sur/#where
- Biomes: tropical, subtropical
- Stand: plantation
- Trees measured: 20. Cite: https://treeallometry.org/equations/coutinho-2018-needles-sur/#n_trees
- DBH range: 8.2–23.7 cm. Cite: https://treeallometry.org/equations/coutinho-2018-needles-sur/#dbh
- Height range: 6.4–14.2 m. Cite: https://treeallometry.org/equations/coutinho-2018-needles-sur/#height
- R²: 0.53. Cite: https://treeallometry.org/equations/coutinho-2018-needles-sur/#r2
- Method: Simultaneous (SUR) linear regression ensuring additivity; R2 reported is adjusted R2. Cite: https://treeallometry.org/equations/coutinho-2018-needles-sur/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/coutinho-2018-needles-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-needles-sur/#source

## The facts, in the source's words

**Equation** (Table 5):

> bsneedles = β0+β1DBH+β2TH: -1.943, 0.160, 0.087

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

**R²** (Table 5):

> R2adj 0.53

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

**Our note:** Ten-year-old plantation, 3 m x 3 m spacing, 20 trees. Linear form; can go negative for small trees. Fitted simultaneously with the branch and trunk models (Table 5).

## 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 | 0.76 | 0.76 | Computed from the printed form: computed from the published form |
| D = 20, H = 13 | 2.39 | 2.39 | Computed from the printed form: computed from the published form |

Cite: https://treeallometry.org/equations/coutinho-2018-needles-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 needle biomass from DBH and height (simultaneous fit)", checked 2026-11-02, https://treeallometry.org/equations/coutinho-2018-needles-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-needles-sur.json
Report a problem: email info@restorationscope.com with the equation id (coutinho-2018-needles-sur) and where the right value appears.