# Quercus cerris AGB, Zerqan site (height, Table 5)

Aboveground biomass equation for Quercus cerris, Albania, from Istrefi et al. 2018. 11 trees, DBH 2.5–14 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Istrefi et al. 2018 (Table 5, Zerqan row, whole tree):

> DW = 0.468 • H1.689

Cite: https://treeallometry.org/equations/istrefi-2018-zerqan-h/#equation

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

```
Aboveground biomass = 0.468 * H^1.689
```

Inputs: H = Total tree height (m).
The source's own form: 0.468 * Ht^1.689, with Ht in m; output in kg.
Cite: https://treeallometry.org/equations/istrefi-2018-zerqan-h/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Quercus cerris (species), family Fagaceae; broadleaf
- Where: Zerqan, Albania (young coppice stand). Cite: https://treeallometry.org/equations/istrefi-2018-zerqan-h/#where
- Biomes: temperate
- Stand: natural
- Trees measured: 11. Cite: https://treeallometry.org/equations/istrefi-2018-zerqan-h/#n_trees
- DBH range: 2.5–14 cm. Cite: https://treeallometry.org/equations/istrefi-2018-zerqan-h/#dbh
- Height range: 2.2–10.5 m. Cite: https://treeallometry.org/equations/istrefi-2018-zerqan-h/#height
- R²: 0.95. Cite: https://treeallometry.org/equations/istrefi-2018-zerqan-h/#r2
- Method: linear or nonlinear regression without transformation. Cite: https://treeallometry.org/equations/istrefi-2018-zerqan-h/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/istrefi-2018-zerqan-h/#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

Istrefi, E., Toromani, E., Çollaku, N. (2018). Allometric Relationships for Estimation of Above-Ground Biomass in Young Turkey Oak (Quercus cerris L.) Stands in Albania. Acta Silvatica et Lignaria Hungarica, 14(1), 65-81.

- DOI: https://doi.org/10.2478/aslh-2018-0004
- Access: open access
- Copy we read: http://real.mtak.hu/88131/1/10.2478-aslh-2018-0004.pdf
- Every equation from this source: https://treeallometry.org/sources/istrefi-2018/
- Cite: https://treeallometry.org/equations/istrefi-2018-zerqan-h/#source

## The facts, in the source's words

**Equation** (Table 5, Zerqan row, whole tree):

> DW = 0.468 • H1.689

Cite: https://treeallometry.org/equations/istrefi-2018-zerqan-h/#equation

**R²** (Table 5, Zerqan row, whole tree, R2 column):

> R2 0.95

Cite: https://treeallometry.org/equations/istrefi-2018-zerqan-h/#quote-fit-r2

**Trees measured** (Table 3, Sampled tree number):

> Zerqan 11

Cite: https://treeallometry.org/equations/istrefi-2018-zerqan-h/#quote-fit-n-trees

**Our note:** Young Q. cerris coppice stand at Zerqan, Albania; whole-tree dry weight DW is the sum of stem, branches and leaves (roots not studied). Site-specific equation fitted on the 8-12 sampled trees of that site; 2.5-14.0 cm DBH and 2.2-10.5 m height are the sampled-tree ranges (Table 3). Fit by regression without transformation, so no correction factor.

## 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 |
| --- | --- | --- | --- |
| H = 6.35 | 10.6 | 10.6 | Computed from the printed form: hand-computed from the published form at the mid-point of the sampled range |

Cite: https://treeallometry.org/equations/istrefi-2018-zerqan-h/#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: Istrefi, E., Toromani, E., Çollaku, N. (2018). Allometric Relationships for Estimation of Above-Ground Biomass in Young Turkey Oak (Quercus cerris L.) Stands in Albania. Acta Silvatica et Lignaria Hungarica, 14(1), 65-81. https://doi.org/10.2478/aslh-2018-0004

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Quercus cerris AGB, Zerqan site (height, Table 5)", checked 2026-11-02, https://treeallometry.org/equations/istrefi-2018-zerqan-h/. 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/istrefi-2018-zerqan-h.json
Report a problem: email info@restorationscope.com with the equation id (istrefi-2018-zerqan-h) and where the right value appears.