# Cryptomeria japonica Generalized stem (wood + bark) (log10, Table 4)

Stem biomass equation for Cryptomeria japonica, South Korea, from Gwon et al. 2014. 10 trees. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Gwon et al. 2014 (Materials and Methods 2):

> log10Y=a+blog10X [Y = dry weight (kg); X: DBH (cm)]

Cite: https://treeallometry.org/equations/gwon-2014-gen-stem/#equation

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

```
Stem biomass = 10^(-0.3799 + 1.7892 * log10(D))
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: 10^(-0.3799 + 1.7892 * log10(DBH)), with DBH in cm; output in kg.
Cite: https://treeallometry.org/equations/gwon-2014-gen-stem/#canonical

## What it covers

- Output: Stem biomass, kg
- Taxon: Cryptomeria japonica (species), family Cupressaceae; conifer
- Where: Samdong-myeon, Namhae-gun, Gyeongsangnam-do, South Korea. Cite: https://treeallometry.org/equations/gwon-2014-gen-stem/#where
- Biomes: temperate
- Stand: plantation
- Trees measured: 10. Cite: https://treeallometry.org/equations/gwon-2014-gen-stem/#n_trees
- R²: 0.71. Cite: https://treeallometry.org/equations/gwon-2014-gen-stem/#r2
- Method: log10-log10 least-squares regression (SAS Proc Reg). Cite: https://treeallometry.org/equations/gwon-2014-gen-stem/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/gwon-2014-gen-stem/#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

Gwon, J.-H., Seo, H., Lee, K.-S., et al. (2014). Allometric Equations and Biomass Expansion Factors by Stand Density in Cryptomeria japonica Plantations. Journal of Korean Forest Society, 103(2), 175-181.

- DOI: https://doi.org/10.14578/jkfs.2014.103.2.175
- Access: open access
- Copy we read: http://koreascience.or.kr/article/JAKO201424635095328.pdf
- Every equation from this source: https://treeallometry.org/sources/gwon-2014/
- Cite: https://treeallometry.org/equations/gwon-2014-gen-stem/#source

## The facts, in the source's words

**Equation** (Materials and Methods 2):

> log10Y=a+blog10X [Y = dry weight (kg); X: DBH (cm)]

Cite: https://treeallometry.org/equations/gwon-2014-gen-stem/#equation

**Equation** (Table 4):

> Generalized equations: Stem (kg) -0.3799 1.7892 0.71 0.005

Cite: https://treeallometry.org/equations/gwon-2014-gen-stem/#quote-expression

**Trees measured** (Materials and Methods 2 (5 felled trees per stand density)):

> 5본을 선정하였다

Cite: https://treeallometry.org/equations/gwon-2014-gen-stem/#quote-fit-n-trees

**Our note:** log10(Y) = a + b*log10(X); the paper prints no correction factor, so none is applied. Pooled over both stand densities (n = 5 + 5). Sample-tree DBH range is not printed, so none is given.

## 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 = 20 | 88.7 | 88.7 | Computed from the printed form: computed from the Table 4 coefficients |
| D = 35 | 241 | 241 | Computed from the printed form: computed from the Table 4 coefficients |

Cite: https://treeallometry.org/equations/gwon-2014-gen-stem/#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: Gwon, J.-H., Seo, H., Lee, K.-S., et al. (2014). Allometric Equations and Biomass Expansion Factors by Stand Density in Cryptomeria japonica Plantations. Journal of Korean Forest Society, 103(2), 175-181. https://doi.org/10.14578/jkfs.2014.103.2.175

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Cryptomeria japonica Generalized stem (wood + bark) (log10, Table 4)", checked 2026-11-02, https://treeallometry.org/equations/gwon-2014-gen-stem/. 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/gwon-2014-gen-stem.json
Report a problem: email info@restorationscope.com with the equation id (gwon-2014-gen-stem) and where the right value appears.