{"id":"tena-2026-pterocarpus-lucens-m1","source":{"id":"tena-2026","citation":"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.","title":"Biomass Estimation Models for Combretum-Terminalia Woodlands of Western Ethiopia: Implications for Carbon Accounting, Climate-Change Mitigation, and Biodiversity Conservation","authors":["Tena, A.","Tolera, M.","Abich, A.","Tamirat, T."],"year":2026,"type":"journal-article","venue":"Ecology and Evolutionary Biology","doi":"10.11648/j.eeb.20261103.12","url":"https://doi.org/10.11648/j.eeb.20261103.12","read_url":"http://article.sciencepg.com/pdf/j.eeb.20261103.12","access":"open","license":"CC BY 4.0","checked_at":"2026-11-05","status":"current","notes":"The [publisher's article page](https://sciencepublishinggroup.com/article/10.11648/j.eeb.20261103.12) lists a research article. Crossref metadata could not be reached to independently confirm its type."},"name":"Pterocarpus lucens aboveground biomass, M1","output":{"quantity":"agb","excludes":["foliage"]},"expression":"exp(-2.723 + 2.657 * ln(D)) * 1.025","published":{"expression":"exp(-2.723 + 2.657 * ln(DBH)) * 1.025","units":{"DBH":"cm"},"variables":{"DBH":"D"},"output_unit":"kg"},"taxon":{"level":"species","name":"Pterocarpus lucens","group":"broadleaf"},"region":{"scope":"site","countries":["ET"],"place":"Homosha district, Asosa Zone, Benishangul-Gumuz, western Ethiopia","biomes":["tropical","dryland"]},"fit":{"n_trees":12,"r2":0.975,"cf":1.025,"method":"log-linear regression"},"evidence":[{"field":"expression","quote":"ln(B) = ln(β0) + β1ln(DBH) + Ɛ M1","locator":"Methods §2.6, p. 54 (PDF p. 4)"},{"field":"expression","quote":"-2.723(0.389)***     2.657(0.128)***","locator":"Table 1, Pterocarpus lucens row, p. 57 (PDF p. 7)"},{"field":"expression","quote":"unit values and multiplied by the correction factor.","locator":"Methods §2.7, p. 55 (PDF p. 5)"},{"field":"output","quote":"total dry weight of a tree was obtained by summing the dry","locator":"Methods §2.3, p. 54 (PDF p. 4)"},{"field":"output.excludes","quote":"The total dry weight of a tree was obtained by summing the dry weight of the stump, stem, and branches.","locator":"Methods §2.3, p. 54 (PDF p. 4)"},{"field":"output","quote":"Branches and twigs and leaves were determined","locator":"Methods §2.5, p. 54 (PDF p. 4)"},{"field":"published.units","quote":"diameter at breast height (cm)","locator":"Methods §2.6, p. 54 (PDF p. 4)"},{"field":"published.units","quote":"TAGB is the total aboveground biomass (kg)","locator":"Methods §2.5, p. 54 (PDF p. 4)"},{"field":"fit.n_trees","quote":"AGB M1           12 -2.723","locator":"Table 1, Pterocarpus lucens row, p. 57 (PDF p. 7)"},{"field":"fit.r2","quote":"0.975 1.025 17.31","locator":"Table 1, Pterocarpus lucens row, p. 57 (PDF p. 7)"},{"field":"fit.cf","quote":"0.975 1.025 17.31","locator":"Table 1, Pterocarpus lucens row, p. 57 (PDF p. 7)"},{"field":"fit.method","quote":"to a natural logarithm to use the linear regression method","locator":"Methods §2.6, p. 54 (PDF p. 4)"},{"field":"taxon","quote":"Pterocarpus lucens","locator":"Abstract, p. 51 (PDF p. 1)"},{"field":"region","quote":"For this study, the Homosha district was selected purpos-","locator":"Methods §2.2, p. 53 (PDF p. 3)"}],"check":[{"inputs":{"D":20},"expected":192.742146,"origin":"computed","note":"Calculated from the transcribed corrected form; the species-specific fitted diameter range is not reported."}],"verification":"original_read","doubt":"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.","checked_at":"2026-11-05","notes":"The table coefficient is back-transformed and multiplied once by the printed correction factor. DBH is measured at 1.3 m. Table 1 describes R² as adjusted. The authors selected M1 for this species and emphasize applying the correction factor. The paper does not describe a held-out validation subset."}