{"id":"amanuel-2024-total-m8","source":{"id":"amanuel-2024","citation":"Amanuel, W., Tadesse, C., Molla, M., Getinet, D., Mekonnen, Z. (2024). Allometric equation for estimating aboveground biomass of Acacia-Commiphora forest, southern Ethiopia. Journal of Ecology and Environment, 48, 20.","title":"Allometric equation for estimating aboveground biomass of Acacia-Commiphora forest, southern Ethiopia","authors":["Amanuel, W.","Tadesse, C.","Molla, M."],"year":2024,"venue":"Journal of Ecology and Environment","doi":"10.5141/jee.24.036","url":"https://doi.org/10.5141/jee.24.036","read_url":"https://www.e-jecoenv.org/journal/download_pdf.php?doi=10.5141/jee.24.036","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current","notes":"Read the full open PDF. Eight of the nine total-AGB models (M1-M5, M7-M9) are captured; M6 (D, H, CW) is not. Stem, branch and foliage models are not captured (the branch parameters in Table 3 look like a linear-scale fit while the text prints them inside exp{}). Inconsistencies in the paper: the abstract says M9 uses DSH10 while Table 1, Table 3 and the text use DSH30; the Table 3 caption says twelve species while the Methods and Conclusions say eleven."},"name":"Acacia-Commiphora total AGB, M8 (rho D2 H, crown width, D30)","output":{"quantity":"agb"},"expression":"exp(-0.6207 + 0.4041 * ln(rho * D^2 * H) + 0.4999 * ln(CD) + 0.4446 * ln(D30))","published":{"expression":"exp(-0.6207 + 0.4041 * ln(rho * D^2 * H) + 0.4999 * ln(CW) + 0.4446 * ln(DSH30))","units":{"CW":"m","D":"cm","DSH30":"cm","H":"m","rho":"g/cm3"},"variables":{"CW":"CD","DSH30":"D30"},"output_unit":"kg"},"taxon":{"level":"mixed","name":"Eleven woody species of the Acacia-Commiphora biome (mixed)","group":"broadleaf"},"region":{"scope":"site","countries":["ET"],"place":"Bena-Tsemay district, southern Ethiopia","biomes":["tropical","dryland"]},"stand":"natural","fit":{"n_trees":140,"r2":0.83,"method":"ln-ln multiple linear regression (SAS); no correction factor stated"},"evidence":[{"field":"expression","quote":"8a   –0.6207   0.2108   0.4041   0.0911   0.4999   0.2052   0.4446   0.2240   0.40b   0.83b   0.83b","locator":"Table 3, AGBTotal rows, p. 6; model form in Table 1, p. 4"},{"field":"model form","quote":"AGBest. = exp {α + β1Ln (ρ.D2.H) + β2Ln (CW) + β3Ln (DSH30)}","locator":"Table 1, p. 4"},{"field":"fit.n_trees","quote":"The biomass of the 140 individual trees was considered for biomass model development.","locator":"Methods, Biomass measurement, p. 3"},{"field":"fit.r2","quote":"8a   –0.6207   0.2108   0.4041   0.0911   0.4999   0.2052   0.4446   0.2240   0.40b   0.83b   0.83b","locator":"Table 3, AGBTotal, columns R2 / Adj-R2"}],"check":[{"inputs":{"D":8,"H":4,"rho":0.7,"CD":3,"D30":9},"expected":20.127,"origin":"computed","note":"computed from the published form (coefficients as printed, no correction factor)"},{"inputs":{"D":15,"H":6,"rho":0.7,"CD":4.5,"D30":16},"expected":62.33,"origin":"computed","note":"computed from the published form (coefficients as printed, no correction factor)"},{"inputs":{"D":25,"H":8,"rho":0.7,"CD":6,"D30":26},"expected":151.6,"origin":"computed","note":"computed from the published form (coefficients as printed, no correction factor)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Total aboveground dry biomass (stem + branches + foliage summed). In the paper D is DBH (cm), DSH30 is stem diameter at 30 cm (mapped to D30), CW is crown width (mapped to CD, m), rho is basic wood density (g/cm3). R2 shown is the printed R2 (Adj-R2 is within 0.01). No back-transformation correction factor is printed, so none is applied. The paper prints the mean D (12.61 cm) and a D range width of 29 cm but no min or max, so no DBH range is stored. RMSE printed in Table 3 is on the log scale. n = 140 is the full sample; Methods (p. 3) say 30% was held out for validation, so the fitted n may be ~98. The abstract and Results text say DSH10; Table 1 and the printed equations use DSH30, used here."}