{"id":"shumie-2024-stem","source":{"id":"shumie-2024","citation":"Shumie, A., Alemu, A., Abebe, G., et al. (2024). Allometric equations for estimation of above- and below-ground biomass of Acacia mearnsii in northwestern Ethiopia. Forest Science and Technology, 20(3), 279-285.","title":"Allometric equations for estimation of above- and below-ground biomass of Acacia mearnsii in northwestern Ethiopia","authors":["Shumie, A.","Alemu, A.","Abebe, G."],"year":2024,"venue":"Forest Science and Technology","doi":"10.1080/21580103.2024.2366831","url":"https://doi.org/10.1080/21580103.2024.2366831","read_url":"https://www.tandfonline.com/doi/full/10.1080/21580103.2024.2366831","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current"},"name":"Acacia mearnsii Stem biomass from D and H (Table 3, model 1)","output":{"quantity":"stem_biomass"},"expression":"0.99 + 0.01 * (D * H)^1.75","published":{"expression":"0.99 + 0.01 * (D * H)^1.75","units":{"D":"cm","H":"m"},"output_unit":"kg"},"taxon":{"level":"species","name":"Acacia mearnsii","family":"Fabaceae","group":"broadleaf"},"region":{"scope":"regional","countries":["ET"],"place":"Farmer-managed woodlots, northwestern Ethiopia (Amhara)","biomes":["tropical","montane"]},"stand":"plantation","fit":{"n_trees":24,"dbh_min_cm":1.1,"dbh_max_cm":11.9,"h_min_m":2.1,"h_max_m":6.8,"r2":0.9864,"method":"nonlinear regression, form a + b(DH)^c"},"evidence":[{"field":"expression","quote":"Stem biomass 1. a + b(DH)c 0.99 0.01 1.75 98.64","locator":"Table 3, Stem biomass model 1"},{"field":"fit.n_trees","quote":"twenty-four trees of varying ages (3, 4, 5, and 6 years) were harvested","locator":"Abstract"},{"field":"fit.dbh_min_cm","quote":"Tree parameters DBH (cm) 24 1.1 7.1 11.9; Height (m) 24 2.1 4.4 6.8 (n, min, mean, max)","locator":"Table 2"}],"check":[{"inputs":{"D":3,"H":2.5},"expected":1.3299,"origin":"computed","note":"computed from the published form"},{"inputs":{"D":7,"H":4.4},"expected":5.0168,"origin":"computed","note":"computed from the published form"},{"inputs":{"D":11,"H":6.5},"expected":18.5707,"origin":"computed","note":"computed from the published form"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Coefficients are printed to two decimals only, so predictions are coarse for small trees. D is DBH in cm, H in m, biomass in kg (Table 2). Trees aged 3 to 6 years. R2 printed as a percentage and converted to a fraction. Table 3 was read from the journal CSV download; the column order is a, b, c, R2, RMSE, MAD, AIC, p. Stem, AGB and total biomass model 1 are the best models per the authors. Branch and leaf models are not added (Table 3: R2 about 0.5 for branches and about 0.6 for leaves)."}