# Mongolian pine plantation aboveground biomass (stem+branch+foliage), Mu Us (Table 3)

Aboveground biomass equation for Pinus sylvestris var. mongolica, China, from Siqing et al. 2022. 131 trees, DBH 2.4–44.2 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Siqing et al. 2022 (Table 3, Aboveground row):

> Aboveground Wag = 0.041D1.699H0.983 + 0.020D2.497 + 0.094D1.898

Cite: https://treeallometry.org/equations/siqing-2022-agb/#equation

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

```
Aboveground biomass = 0.041 * D^1.699 * H^0.983 + 0.020 * D^2.497 + 0.094 * D^1.898
```

Inputs: D = Diameter at breast height (1.3 m) (cm); H = Total tree height (m).
The source's own form: 0.041 * D^1.699 * H^0.983 + 0.020 * D^2.497 + 0.094 * D^1.898, with D in cm, H in m; output in kg.
Cite: https://treeallometry.org/equations/siqing-2022-agb/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Pinus sylvestris var. mongolica (species), family Pinaceae; conifer
- Where: Mu Us Sandy Land, Ordos, Inner Mongolia, China. Cite: https://treeallometry.org/equations/siqing-2022-agb/#where
- Biomes: temperate, dryland
- Stand: plantation
- Trees measured: 131. Cite: https://treeallometry.org/equations/siqing-2022-agb/#n_trees
- DBH range: 2.4–44.2 cm. Cite: https://treeallometry.org/equations/siqing-2022-agb/#dbh
- Height range: 1.9–15.25 m. Cite: https://treeallometry.org/equations/siqing-2022-agb/#height
- Method: weighted nonlinear seemingly unrelated regression (WNSUR), additive system. Cite: https://treeallometry.org/equations/siqing-2022-agb/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/siqing-2022-agb/#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

Siqing, B., Meng, S., Liu, L., et al. (2022). Additive Allometric Equations to Improve Aboveground Biomass Estimation for Mongolian Pine Plantations in Mu Us Sandy Land, Inner Mongolia, China. Forests, 13(10), 1672.

- DOI: https://doi.org/10.3390/f13101672
- Access: open access
- Copy we read: https://www.mdpi.com/1999-4907/13/10/1672/htm
- Every equation from this source: https://treeallometry.org/sources/siqing-2022/
- Cite: https://treeallometry.org/equations/siqing-2022-agb/#source

## The facts, in the source's words

**Equation** (Table 3, Aboveground row):

> Aboveground Wag = 0.041D1.699H0.983 + 0.020D2.497 + 0.094D1.898

Cite: https://treeallometry.org/equations/siqing-2022-agb/#equation

**Trees measured** (Abstract):

> A total of 131 trees were measured

Cite: https://treeallometry.org/equations/siqing-2022-agb/#quote-fit-n-trees

**Our note:** Additive system fitted by WNSUR (Table 3). 131 trees (116 felled, 15 climbed standing trees); n and ranges from Table 1 and Section 2.2. Biomass of stump not included. Exponents are printed flattened in the HTML text (D followed by its exponent); read as D^exponent and consistent with Table 2. No R2 recorded (the paper gives adjusted R2 only). Stump excluded (Section 2.2).

## 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 = 8, H = 5 | 15.3 | 15.3 | Computed from the printed form: computed from the published form (coefficients as printed) |
| D = 20, H = 9 | 121 | 121 | Computed from the printed form: computed from the published form (coefficients as printed) |
| D = 35, H = 13 | 438 | 438 | Computed from the printed form: computed from the published form (coefficients as printed) |

Cite: https://treeallometry.org/equations/siqing-2022-agb/#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: Siqing, B., Meng, S., Liu, L., et al. (2022). Additive Allometric Equations to Improve Aboveground Biomass Estimation for Mongolian Pine Plantations in Mu Us Sandy Land, Inner Mongolia, China. Forests, 13(10), 1672. https://doi.org/10.3390/f13101672

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Mongolian pine plantation aboveground biomass (stem+branch+foliage), Mu Us (Table 3)", checked 2026-11-02, https://treeallometry.org/equations/siqing-2022-agb/. 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/siqing-2022-agb.json
Report a problem: email info@restorationscope.com with the equation id (siqing-2022-agb) and where the right value appears.