# Beech saplings on dry sites, stem with bark dry biomass from root-collar diameter (Table 2)

Stem biomass equation for Fagus sylvatica, Germany, Switzerland, from Chakraborty et al. 2016. 20 trees. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Chakraborty et al. 2016 (Table 2, ST Dry row):

> ST Dry a 0.019 b 2.199 Adj-R² 0.71 N 20

Cite: https://treeallometry.org/equations/chakraborty-2016-drc-stem/#equation

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

```
Stem biomass = 0.019 * DRC^2.199
```

Inputs: DRC = Root collar / stem base diameter (cm).
The source's own form: 0.019 * DRC^2.199, with DRC in cm; output in kg.
Cite: https://treeallometry.org/equations/chakraborty-2016-drc-stem/#canonical

## What it covers

- Output: Stem biomass, kg
- Taxon: Fagus sylvatica (species), family Fagaceae; broadleaf
- Where: Five abandoned oak-coppice stands on dry south-facing sites, southern Germany and northern Switzerland. Cite: https://treeallometry.org/equations/chakraborty-2016-drc-stem/#where
- Biomes: temperate
- Stand: natural
- Trees measured: 20. Cite: https://treeallometry.org/equations/chakraborty-2016-drc-stem/#n_trees
- Method: power function regression, biomass = a * diameter^b (dry mass). Cite: https://treeallometry.org/equations/chakraborty-2016-drc-stem/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/chakraborty-2016-drc-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

Chakraborty, T., Saha, S., & Reif, A. (2016). Biomass equations for European beech growing on dry sites. iForest, 9(5), 751-757.

- DOI: https://doi.org/10.3832/ifor1881-009
- Access: open access
- Copy we read: https://iforest.sisef.org/pdf/?id=ifor1881-009
- Every equation from this source: https://treeallometry.org/sources/chakraborty-2016/
- Cite: https://treeallometry.org/equations/chakraborty-2016-drc-stem/#source

## The facts, in the source's words

**Equation** (Table 2, ST Dry row):

> ST Dry a 0.019 b 2.199 Adj-R² 0.71 N 20

Cite: https://treeallometry.org/equations/chakraborty-2016-drc-stem/#equation

**Trees measured** (Table 2, ST Dry row):

> N 20

Cite: https://treeallometry.org/equations/chakraborty-2016-drc-stem/#quote-fit-n-trees

**Our note:** Dry biomass in kg. Adjusted R2 as printed: 0.71. Saplings only; DRC measured at 5 cm above ground, sapling DRC range 1.1-4.1 cm.. Fitted on dry-site beech; the paper also gives fresh-biomass and log-transformed variants (not added).

## 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 = 1.5 | 0.0463 | 0.0463 | Computed from the printed form: computed from the published coefficients |
| DRC = 2.5 | 0.143 | 0.143 | Computed from the printed form: computed from the published coefficients |
| DRC = 3.5 | 0.299 | 0.299 | Computed from the printed form: computed from the published coefficients |

Cite: https://treeallometry.org/equations/chakraborty-2016-drc-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: Chakraborty, T., Saha, S., & Reif, A. (2016). Biomass equations for European beech growing on dry sites. iForest, 9(5), 751-757. https://doi.org/10.3832/ifor1881-009

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Beech saplings on dry sites, stem with bark dry biomass from root-collar diameter (Table 2)", checked 2026-11-02, https://treeallometry.org/equations/chakraborty-2016-drc-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/chakraborty-2016-drc-stem.json
Report a problem: email info@restorationscope.com with the equation id (chakraborty-2016-drc-stem) and where the right value appears.