# North American taxa group: woodland Pinaceae (Table 5)

Aboveground biomass equation for Woodland Pinaceae (Pinus cembroides, P. edulis, P. monophylla), United States, from Chojnacky et al. 2014. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

Fitted on Pinus cembroides, Pinus edulis, Pinus monophylla.

## Equation

As printed in Chojnacky et al. 2014 (Table 5 caption, p. 140):

> ln(biomass) = β0 + β1 ln(diameter)

Cite: https://treeallometry.org/equations/chojnacky-2014-woodland-pinaceae/#equation

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

```
Aboveground biomass = exp(-3.2007 + 2.5339 * ln(DRC))
```

Inputs: DRC = Root collar / stem base diameter (cm).
The source's own form: exp(-3.2007 + 2.5339 * ln(drc)), with drc in cm; output in kg.
Cite: https://treeallometry.org/equations/chojnacky-2014-woodland-pinaceae/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Woodland Pinaceae (Pinus cembroides, P. edulis, P. monophylla) (mixed species), family Pinaceae; conifer
- Where: United States (equations compiled from US and Canadian studies). Cite: https://treeallometry.org/equations/chojnacky-2014-woodland-pinaceae/#where
- Biomes: temperate, dryland
- Stand: mixed
- R²: 0.86. Cite: https://treeallometry.org/equations/chojnacky-2014-woodland-pinaceae/#r2
- Method: Weighted regression of ln(biomass) on ln(drc) fitted to 45 pseudodata points generated from 5 published equations; no back-transform correction. Cite: https://treeallometry.org/equations/chojnacky-2014-woodland-pinaceae/#method
- Verification: read in the original source
- Last checked: 2026-11-03. Cite: https://treeallometry.org/equations/chojnacky-2014-woodland-pinaceae/#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

Chojnacky, D.C., Heath, L.S., Jenkins, J.C. (2014). Updated generalized biomass equations for North American tree species. Forestry, 87(1), 129–151.

- DOI: https://doi.org/10.1093/forestry/cpt053
- Access: open access
- Copy we read: https://research.fs.usda.gov/download/treesearch/45402.pdf
- Every equation from this source: https://treeallometry.org/sources/chojnacky-2014/
- Cite: https://treeallometry.org/equations/chojnacky-2014-woodland-pinaceae/#source

## The facts, in the source's words

**Equation** (Table 5 caption, p. 140):

> ln(biomass) = β0 + β1 ln(diameter)

Cite: https://treeallometry.org/equations/chojnacky-2014-woodland-pinaceae/#equation

**Equation** (Table 5 row, p. 140):

> Pinaceae 0.51 −3.2007 2.5339 45 5 drc 3–75 0.86

Cite: https://treeallometry.org/equations/chojnacky-2014-woodland-pinaceae/#quote-expression

**Taxon** (Table 4, p. 138):

> Pinaceae P. edulis Pine, pinyon 106 0.51 2

Cite: https://treeallometry.org/equations/chojnacky-2014-woodland-pinaceae/#quote-taxon

**Correction factor** (Methods, p. 139):

> we did not include a correction (Baskerville, 1972) for underestimation

Cite: https://treeallometry.org/equations/chojnacky-2014-woodland-pinaceae/#quote-fit-cf

**Our note:** Pinyon pines, by root-collar diameter. Root-collar diameter range of the pseudodata: 3–75 cm. Median specific gravity of the group: 0.51. R² is the published 'R²-statistic'.

## 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 |
| --- | --- | --- | --- |
| DRC = 30 | 225 | 225 | Computed from the printed form: computed from the published form at drc = 30 cm |

Cite: https://treeallometry.org/equations/chojnacky-2014-woodland-pinaceae/#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: Chojnacky, D.C., Heath, L.S., Jenkins, J.C. (2014). Updated generalized biomass equations for North American tree species. Forestry, 87(1), 129–151. https://doi.org/10.1093/forestry/cpt053

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "North American taxa group: woodland Pinaceae (Table 5)", checked 2026-11-03, https://treeallometry.org/equations/chojnacky-2014-woodland-pinaceae/. 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/chojnacky-2014-woodland-pinaceae.json
Report a problem: email info@restorationscope.com with the equation id (chojnacky-2014-woodland-pinaceae) and where the right value appears.