# Jatropha mollissima, caatinga, DBH

Aboveground biomass equation for Jatropha mollissima, Brazil, from Sampaio & Silva 2005. 30 trees. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Sampaio & Silva 2005 (Table 2, p. 938):

> J. mollissima: 0.1970*DBH1.8145  R2 0.8288

Cite: https://treeallometry.org/equations/sampaio-2005-jatropha-mollissima-dbh/#equation

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

```
Aboveground biomass = 0.197 * D^1.8145
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: 0.197 * DBH^1.8145, with DBH in cm; output in kg.
Cite: https://treeallometry.org/equations/sampaio-2005-jatropha-mollissima-dbh/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Jatropha mollissima (species); broadleaf
- Where: Santaluz (Bahia) and Petrolina (Pernambuco), Depressão Sertaneja, Brazilian semiarid. Cite: https://treeallometry.org/equations/sampaio-2005-jatropha-mollissima-dbh/#where
- Biomes: tropical, dryland
- Stand: natural
- Trees measured: 30. Cite: https://treeallometry.org/equations/sampaio-2005-jatropha-mollissima-dbh/#n_trees
- R²: 0.8288. Cite: https://treeallometry.org/equations/sampaio-2005-jatropha-mollissima-dbh/#r2
- Method: power equation B = a*x^b (oven-dry aboveground biomass, kg). Cite: https://treeallometry.org/equations/sampaio-2005-jatropha-mollissima-dbh/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/sampaio-2005-jatropha-mollissima-dbh/#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

Sampaio, E. V. S. B., & Silva, G. C. (2005). Biomass equations for Brazilian semiarid caatinga plants. Acta Botanica Brasilica, 19(4), 935-943.

- DOI: https://doi.org/10.1590/s0102-33062005000400028
- Access: open access
- Copy we read: https://www.scielo.br/j/abb/a/H7MJLqBYjHc4Bp63L6pyHsG/?lang=en&format=pdf
- Every equation from this source: https://treeallometry.org/sources/sampaio-2005/
- Cite: https://treeallometry.org/equations/sampaio-2005-jatropha-mollissima-dbh/#source

## The facts, in the source's words

**Equation** (Table 2, p. 938):

> J. mollissima: 0.1970*DBH1.8145  R2 0.8288

Cite: https://treeallometry.org/equations/sampaio-2005-jatropha-mollissima-dbh/#equation

**R²** (Table 2, p. 938):

> R2 0.8288

Cite: https://treeallometry.org/equations/sampaio-2005-jatropha-mollissima-dbh/#quote-fit-r2

**Trees measured** (Material and methods, p. 936):

> Each species was represented by 30 individuals

Cite: https://treeallometry.org/equations/sampaio-2005-jatropha-mollissima-dbh/#quote-fit-n-trees

**Our note:** Table 2 prints each equation as a*DGL^b or a*DBH^b with the exponent as superscript (flattened here with ^). Biomass is oven-dry aboveground plant biomass in kg (Table 2 title), diameters in cm. Wood dried at 60 C. Plants were cut at the base and the stump was included in the weighed biomass. Perimeters were converted to diameters assuming a circular shape; for branching below measuring height, branch areas were summed into one equivalent diameter. DGL is stem diameter at ground level, mapped to DRC. 

## 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 = 5 | 3.65 | 3.65 | Computed from the printed form: hand-computed from the published form |
| D = 15 | 26.8 | 26.8 | Computed from the printed form: hand-computed from the published form |

Cite: https://treeallometry.org/equations/sampaio-2005-jatropha-mollissima-dbh/#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: Sampaio, E. V. S. B., & Silva, G. C. (2005). Biomass equations for Brazilian semiarid caatinga plants. Acta Botanica Brasilica, 19(4), 935-943. https://doi.org/10.1590/s0102-33062005000400028

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Jatropha mollissima, caatinga, DBH", checked 2026-11-02, https://treeallometry.org/equations/sampaio-2005-jatropha-mollissima-dbh/. 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/sampaio-2005-jatropha-mollissima-dbh.json
Report a problem: email info@restorationscope.com with the equation id (sampaio-2005-jatropha-mollissima-dbh) and where the right value appears.