# Dipterocarp forests Vietnam, mixed-species AGB from D and H (M2)

Aboveground biomass equation for Mixed species, dipterocarp forest (26 species), Vietnam, from Huy et al. 2016. 222 trees, DBH 3.4–48.8 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Huy et al. 2016 (Table 4):

> M2 DBH, H AGB = a × DBHb × Hc; a 0.03844, b 2.40756, c 0.40408

Cite: https://treeallometry.org/equations/huy-2016-m2-d-h/#equation

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

```
Aboveground biomass = 0.03844 * D^2.40756 * H^0.40408
```

Inputs: D = Diameter at breast height (1.3 m) (cm); H = Total tree height (m).
The source's own form: 0.03844 * DBH^2.40756 * H^0.40408, with DBH in cm, H in m; output in kg.
Cite: https://treeallometry.org/equations/huy-2016-m2-d-h/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Mixed species, dipterocarp forest (26 species) (mixed species); broadleaf
- Where: Dipterocarp forests, Central Highlands and Southeast ecoregions, Vietnam. Cite: https://treeallometry.org/equations/huy-2016-m2-d-h/#where
- Biomes: tropical
- Stand: natural
- Trees measured: 222. Cite: https://treeallometry.org/equations/huy-2016-m2-d-h/#n_trees
- DBH range: 3.4–48.8 cm. Cite: https://treeallometry.org/equations/huy-2016-m2-d-h/#dbh
- Height range: 2.5–23.5 m. Cite: https://treeallometry.org/equations/huy-2016-m2-d-h/#height
- Method: nonlinear weighted least squares (power variance function). Cite: https://treeallometry.org/equations/huy-2016-m2-d-h/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/huy-2016-m2-d-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

Huy, B., Poudel, K. P., Kralicek, K., Hung, N. D., Khoa, P. V., Phuong, V. T., & Temesgen, H. (2016). Allometric Equations for Estimating Tree Aboveground Biomass in Tropical Dipterocarp Forests of Vietnam. Forests, 7(8), 180.

- DOI: https://doi.org/10.3390/f7080180
- Access: open access
- Copy we read: https://www.mdpi.com/1999-4907/7/8/180/htm
- Every equation from this source: https://treeallometry.org/sources/huy-2016/
- Cite: https://treeallometry.org/equations/huy-2016-m2-d-h/#source

## The facts, in the source's words

**Equation** (Table 4):

> M2 DBH, H AGB = a × DBHb × Hc; a 0.03844, b 2.40756, c 0.40408

Cite: https://treeallometry.org/equations/huy-2016-m2-d-h/#equation

**Trees measured** (Section 2.2):

> A total of 222 trees were destructively sampled

Cite: https://treeallometry.org/equations/huy-2016-m2-d-h/#quote-fit-n-trees

**Smallest DBH** (Table 2):

> Min 3.4 / Max 48.8 (DBH, Mixed-Species)

Cite: https://treeallometry.org/equations/huy-2016-m2-d-h/#quote-fit-dbh-min-cm

**Our note:** AGB is the sum of stem, branch and foliage dry mass. Fitted on the whole dataset with the fixed-effects model; the random ecoregion effect was not retained. No correction factor is stated.

## 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 = 10, H = 8 | 22.8 | 22.8 | Computed from the printed form: computed from the published form (coefficients as printed) |
| D = 20, H = 14 | 151 | 151 | Computed from the printed form: computed from the published form (coefficients as printed) |
| D = 40, H = 20 | 928 | 928 | Computed from the printed form: computed from the published form (coefficients as printed) |

Cite: https://treeallometry.org/equations/huy-2016-m2-d-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: Huy, B., Poudel, K. P., Kralicek, K., Hung, N. D., Khoa, P. V., Phuong, V. T., & Temesgen, H. (2016). Allometric Equations for Estimating Tree Aboveground Biomass in Tropical Dipterocarp Forests of Vietnam. Forests, 7(8), 180. https://doi.org/10.3390/f7080180

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Dipterocarp forests Vietnam, mixed-species AGB from D and H (M2)", checked 2026-11-02, https://treeallometry.org/equations/huy-2016-m2-d-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/huy-2016-m2-d-h.json
Report a problem: email info@restorationscope.com with the equation id (huy-2016-m2-d-h) and where the right value appears.