{"id":"teshome-2022-stembm-m10","source":{"id":"teshome-2022","citation":"Teshome, M., Torres, C.M.M.E., Sileshi, G.W., de Mattos, P.P., Braz, E.M., Temesgen, H., da Rocha, S.J.S.S., Alebachew, M. (2022). Mixed-Species Allometric Equations to Quantify Stem Volume and Tree Biomass in Dry Afromontane Forest of Ethiopia. Open Journal of Forestry, 12(3), 263-296.","title":"Mixed-Species Allometric Equations to Quantify Stem Volume and Tree Biomass in Dry Afromontane Forest of Ethiopia","authors":["Teshome, M.","Torres, C.M.M.E.","Sileshi, G.W."],"year":2022,"venue":"Open Journal of Forestry","doi":"10.4236/ojf.2022.123015","url":"https://doi.org/10.4236/ojf.2022.123015","read_url":"https://content.scirp.org/pdf/ojf_2022050715212549.pdf","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current","notes":"Only the linear (ln-ln) models of Tables 4 and 6 are extracted. The nonlinear models are not extracted: their printed beta0 values are rounded to 0.0001-0.0015 and, in Table 6, the M13 and M14 rows look swapped relative to the forms in Table 1 (M13 row has four parameters, M14 row has two). The abstract says 193 trees; Section 2.4 says 194 sampled and one 98 cm leverage tree excluded from all analyses, so 193 were used."},"name":"Stem biomass from rho d2h (M10, best model)","output":{"quantity":"stem_biomass"},"expression":"1.001 * (exp(-2.983 + 0.949 * ln(rho * D^2 * H)))","published":{"expression":"exp(-2.983 + 0.949 * ln(rho * d^2 * h))","units":{"d":"cm","h":"m","rho":"g/cm3"},"variables":{"d":"D","h":"H"},"output_unit":"kg"},"taxon":{"level":"mixed","name":"Seven dominant species of Chilimo forest (Juniperus procera, Podocarpus falcatus, Olea africana, Allophylus abyssinicus, Olinia rochetiana, Rhus glutinosa, Scolopia theifolia)","group":"mixed","members":["Juniperus procera","Podocarpus falcatus","Olea africana","Allophylus abyssinicus","Olinia rochetiana","Rhus glutinosa","Scolopia theifolia"],"members_complete":true},"region":{"scope":"site","countries":["ET"],"place":"Chilimo dry Afromontane forest, central Ethiopia","biomes":["montane"]},"stand":"natural","fit":{"n_trees":193,"dbh_min_cm":6.2,"dbh_max_cm":85,"h_min_m":5.6,"h_max_m":27.4,"cf":1.001,"method":"Robust linear regression (rlm, Tukey bisquare) of ln(response) on ln predictors"},"evidence":[{"field":"expression","quote":"ln(b) = -2.983 + 0.949 * ln(ρ d^2 h)","locator":"Abstract"},{"field":"coefficients","quote":"M10 -2.983 0.949","locator":"Table 6"},{"field":"fit.n_trees","quote":"A total of 193 sampled trees from seven dominant tree species were used to develop the equations.","locator":"Abstract"},{"field":"fit.dbh","quote":"The diameter, total height, and wood density ranged between 6.2 and 85.0 cm, 5.6 and 27.4 m, and 0.52 and 0.82 g cm-3","locator":"Section 3.1"},{"field":"fit.cf","quote":"CF 1.001","locator":"Supplementary Table S4, p. 293"}],"check":[{"inputs":{"D":20,"H":12,"rho":0.6},"expected":97.251654,"origin":"computed","note":"hand-computed from the published form; CF 1.001 applied"},{"inputs":{"D":50,"H":20,"rho":0.6},"expected":898.921023,"origin":"computed","note":"hand-computed from the published form; CF 1.001 applied"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Stem biomass only (branches and leaves not measured), computed as stem volume times basic wood density of each species, so dry mass. Range in fit is for the 194 sampled trees (Section 3.1). Back-transform CF 1.001 from Table S4 applied in expression."}