{"id":"manjate-2025-bspiciformis-stem-volume","source":{"id":"manjate-2025","citation":"Manjate, A., Goodman, R., Zahabu, E., Ilstedt, U., & Egas, A. (2025). Allometric Models to Estimate the Merchantable Wood Volume and Biomass of the Most Abundant Miombo Species in the Miombo Woodlands in Mozambique. Earth, 6(2), 52.","title":"Allometric Models to Estimate the Merchantable Wood Volume and Biomass of the Most Abundant Miombo Species in the Miombo Woodlands in Mozambique","authors":["Manjate, A.","Goodman, R.","Zahabu, E."],"year":2025,"venue":"Earth","doi":"10.3390/earth6020052","url":"https://doi.org/10.3390/earth6020052","read_url":"https://www.mdpi.com/2673-4834/6/2/52/htm","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current","notes":"Biomass equations (Tables 8 and 9) were not entered because the biomass unit is not stated in the text; heartwood and ratio models have no matching output quantity."},"name":"Brachystegia spiciformis stem merchantable volume from D2H","output":{"quantity":"stem_volume"},"expression":"3.32e-05 * (D^2 * H)^0.953","published":{"expression":"3.32e-05 * (DBH^2 * Ht)^0.953","units":{"DBH":"cm","Ht":"m"},"variables":{"DBH":"D","Ht":"H"},"output_unit":"m3"},"taxon":{"level":"species","name":"Brachystegia spiciformis","family":"Fabaceae","group":"broadleaf"},"region":{"scope":"site","countries":["MZ"],"place":"Levasflor forests, Cheringoma district, Sofala province","biomes":["tropical","dryland"]},"stand":"natural","fit":{"n_trees":37,"dbh_min_cm":17,"dbh_max_cm":81,"h_min_m":12,"h_max_m":26,"method":"Non-linear weighted power model, Y = b0 (DBH^2 Ht)^b1 x error"},"evidence":[{"field":"expression","quote":"Y = 3.32 × 10−5 × (DBH2 × Ht)0.953","locator":"Table 4, stem merchantable wood volume under bark, Model 2"},{"field":"fit.n_trees","quote":"37 B. spiciformis trees (DBH ranging from 17 to 81cm and height ranging from 12 to 26 m)","locator":"Section 2.2"}],"check":[{"inputs":{"D":30,"H":15},"expected":0.28665,"origin":"computed","note":"computed from the published form"},{"inputs":{"D":50,"H":20},"expected":0.99829,"origin":"computed","note":"computed from the published form"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Model 2 (DBH2 x Ht) was the best of the three models by AIC and BIC. Volume is merchantable wood under bark (stem or branches down to a 15 cm top diameter over bark), in m3. No correction factor is stated. Stem part only (from 15 cm diameter over bark)."}