# Cryptomeria japonica Stem (wood + bark) from DBH (Table 3)

Stem biomass equation for Cryptomeria japonica, South Korea, from Jung et al. 2014. 18 trees, DBH 13–28 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Jung et al. 2014 (Materials and Methods, Data analysis):

> Y = exp [a + b*ln(X)]

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

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

```
Stem biomass = 1.001 * exp(-2.629 + 2.278 * ln(D))
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: 1.001 * exp(-2.629 + 2.278 * ln(DBH)), with DBH in cm; output in kg.
Cite: https://treeallometry.org/equations/jung-2014-stem/#canonical

## What it covers

- Output: Stem biomass, kg
- Taxon: Cryptomeria japonica (species), family Cupressaceae; conifer
- Where: Hannam experimental forest, Mount Halla, Jeju Island, South Korea. Cite: https://treeallometry.org/equations/jung-2014-stem/#where
- Biomes: temperate, subtropical
- Stand: plantation
- Trees measured: 18. Cite: https://treeallometry.org/equations/jung-2014-stem/#n_trees
- DBH range: 13–28 cm. Cite: https://treeallometry.org/equations/jung-2014-stem/#dbh
- Height range: 9–14 m. Cite: https://treeallometry.org/equations/jung-2014-stem/#height
- R²: 0.939. Cite: https://treeallometry.org/equations/jung-2014-stem/#r2
- Correction factor: 1.001 (applied). Cite: https://treeallometry.org/equations/jung-2014-stem/#cf
- Method: log-log regression with Sprugel correction factor (SAS 9.1). Cite: https://treeallometry.org/equations/jung-2014-stem/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/jung-2014-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

Jung, S.C., Lumbres, R.I.C., Won, H.K., Seo, Y.O. (2014). Allometric equations, stem density and biomass expansion factors for Cryptomeria japonica in Mount Halla, Jeju Island, Korea. Journal of Ecology and Environment, 37(4), 177-184.

- DOI: https://doi.org/10.5141/ecoenv.2014.021
- Access: open access
- Copy we read: https://koreascience.or.kr/article/JAKO201435648478256.pdf
- Every equation from this source: https://treeallometry.org/sources/jung-2014/
- Cite: https://treeallometry.org/equations/jung-2014-stem/#source

## The facts, in the source's words

**Equation** (Materials and Methods, Data analysis):

> Y = exp [a + b*ln(X)]

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

**Equation** (Table 3 (columns a, b, RMSE, R2, CF)):

> Stem -2.629 2.278 0.139 0.939 1.001

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

**Trees measured** (Data collection):

> A total of 18 representative sample trees were selected based on their DBH class.

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

**Smallest DBH** (Table 1):

> DBH (cm) 20 (13-28)

Cite: https://treeallometry.org/equations/jung-2014-stem/#quote-fit-dbh-min-cm

**Our note:** Y = CF * exp[a + b*ln(X)], Y in kg, X = DBH in cm; the Sprugel correction factor CF = exp(SEE^2/2) from Table 3 is applied (text: Sprugel correction factors were used to correct the bias). Table 3 prints no n per equation; n = 18 harvested sample trees (roots of all 18 reported in Table 2). Single 40-year-old stand.

## 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 = 15 | 34.5 | 34.5 | Computed from the printed form: computed from the Table 3 coefficients and CF |
| D = 25 | 110.5 | 110.5 | Computed from the printed form: computed from the Table 3 coefficients and CF |

Cite: https://treeallometry.org/equations/jung-2014-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: Jung, S.C., Lumbres, R.I.C., Won, H.K., Seo, Y.O. (2014). Allometric equations, stem density and biomass expansion factors for Cryptomeria japonica in Mount Halla, Jeju Island, Korea. Journal of Ecology and Environment, 37(4), 177-184. https://doi.org/10.5141/ecoenv.2014.021

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Cryptomeria japonica Stem (wood + bark) from DBH (Table 3)", checked 2026-11-02, https://treeallometry.org/equations/jung-2014-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/jung-2014-stem.json
Report a problem: email info@restorationscope.com with the equation id (jung-2014-stem) and where the right value appears.