# Syzygium guineense aboveground biomass, M2 Aboveground biomass equation (without leaves) for Syzygium guineense, Ethiopia, from Tena et al. 2026. 9 trees. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it. **Not fully checked:** Foliage coverage is inconsistent: §2.3 (p. 54) sums stump, stem and branches, whereas §2.5 says leaves were determined when measuring total aboveground biomass. This record follows the explicit dry-mass sum and excludes foliage; confirm foliage coverage before treating the prediction as complete aboveground biomass or adding a separate foliage estimate. ## Equation As printed in Tena et al. 2026 (Methods §2.6, p. 54 (PDF p. 4)): > ln(B) = ln(β0) + β1ln(DBH) + β2ln(H) + Ɛ M2 Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#equation In this library's units, ready to compute (aboveground biomass, without leaves in kg): ``` Aboveground biomass, without leaves = exp(-4.122 + 1.051 * ln(D) + 2.664 * ln(H)) * 1.013 ``` Inputs: D = Diameter at breast height (1.3 m) (cm); H = Total tree height (m). The source's own form: exp(-4.122 + 1.051 * ln(DBH) + 2.664 * ln(H)) * 1.013, with DBH in cm, H in m; output in kg. Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#canonical This total leaves out leaves (foliage), as the source defines it. ## What it covers - Output: Aboveground biomass, without leaves, kg - Taxon: Syzygium guineense (species); broadleaf - Where: Homosha district, Asosa Zone, Benishangul-Gumuz, western Ethiopia. Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#where - Biomes: tropical, dryland - Stand: not stated - Trees measured: 9. Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#n_trees - R²: 0.967. Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#r2 - Correction factor: 1.013 (applied). Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#cf - Method: log-linear regression. Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#method - Verification: read in the original source - Last checked: 2026-11-05. Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#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 Tena, A., Tolera, M., Abich, A., and Tamirat, T. (2026). Biomass Estimation Models for Combretum-Terminalia Woodlands of Western Ethiopia: Implications for Carbon Accounting, Climate-Change Mitigation, and Biodiversity Conservation. Ecology and Evolutionary Biology, 11(3), 51–61. - DOI: https://doi.org/10.11648/j.eeb.20261103.12 - Peer review: A paper in a peer-reviewed journal. - Access: open access - Copy we read: http://article.sciencepg.com/pdf/j.eeb.20261103.12 - Every equation from this source: https://treeallometry.org/sources/tena-2026/ - Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#source ## The facts, in the source's words **Equation** (Methods §2.6, p. 54 (PDF p. 4)): > ln(B) = ln(β0) + β1ln(DBH) + β2ln(H) + Ɛ M2 Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#equation **Equation** (Table 1, Syzigium guineense row, pp. 56–57 (PDF pp. 6–7)): > -4.122(0.191)*** 1.051(0.122)*** 2.664(0.196)*** Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#quote-expression **Equation** (Methods §2.7, p. 55 (PDF p. 5)): > unit values and multiplied by the correction factor. Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#quote-expression-2 **Output** (Methods §2.3, p. 54 (PDF p. 4)): > total dry weight of a tree was obtained by summing the dry Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#quote-output **output.excludes** (Methods §2.3, p. 54 (PDF p. 4)): > The total dry weight of a tree was obtained by summing the dry weight of the stump, stem, and branches. Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#quote-output-excludes **Output** (Methods §2.5, p. 54 (PDF p. 4)): > Branches and twigs and leaves were determined Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#quote-output-2 **Units** (Methods §2.6, p. 54 (PDF p. 4)): > diameter at breast height (cm) Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#quote-published-units **Units** (Methods §2.6, p. 54 (PDF p. 4)): > total tree height (m) Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#quote-published-units-2 **Units** (Methods §2.5, p. 54 (PDF p. 4)): > TAGB is the total aboveground biomass (kg) Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#quote-published-units-3 **Trees measured** (Table 1, Syzigium guineense row, pp. 56–57 (PDF pp. 6–7)): > AGB M2 9 -4.122 Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#quote-fit-n-trees **R²** (Table 1, Syzigium guineense row, pp. 56–57 (PDF pp. 6–7)): > 0.967 1.013 3.42 Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#quote-fit-r2 **Correction factor** (Table 1, Syzigium guineense row, pp. 56–57 (PDF pp. 6–7)): > 0.967 1.013 3.42 Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#quote-fit-cf **method** (Methods §2.6, p. 54 (PDF p. 4)): > to a natural logarithm to use the linear regression method Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#quote-fit-method **Taxon** (Abstract, p. 51 (PDF p. 1)): > Syzygium guineense Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#quote-taxon **Where** (Methods §2.2, p. 53 (PDF p. 3)): > For this study, the Homosha district was selected purpos- Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#quote-region **Our note:** The table coefficient is back-transformed and multiplied once by the printed correction factor. DBH is measured at 1.3 m; H is total tree height. Table 1 describes R² as adjusted. The authors recommend the height-integrated M2 for this species. Table 1 spells the genus Syzigium; the text uses Syzygium. The paper does not describe a held-out validation subset. ## 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 = 20, H = 10 | 177 | 177 | Computed from the printed form: Calculated from the transcribed corrected form; the species-specific fitted diameter and height ranges are not reported. | Cite: https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/#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: Tena, A., Tolera, M., Abich, A., and Tamirat, T. (2026). Biomass Estimation Models for Combretum-Terminalia Woodlands of Western Ethiopia: Implications for Carbon Accounting, Climate-Change Mitigation, and Biodiversity Conservation. Ecology and Evolutionary Biology, 11(3), 51–61. https://doi.org/10.11648/j.eeb.20261103.12 Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Syzygium guineense aboveground biomass, M2", checked 2026-11-05, https://treeallometry.org/equations/tena-2026-syzygium-guineense-m2/. 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/tena-2026-syzygium-guineense-m2.json Report a problem: email info@restorationscope.com with the equation id (tena-2026-syzygium-guineense-m2) and where the right value appears.