{"id":"aabeyir-2020-m2","source":{"id":"aabeyir-2020","citation":"Aabeyir, R., Adu-Bredu, S., Agyare, W.A., Weir, M.J.C. (2020). Allometric models for estimating aboveground biomass in the tropical woodlands of Ghana, West Africa. Forest Ecosystems, 7, 41.","title":"Allometric models for estimating aboveground biomass in the tropical woodlands of Ghana, West Africa","authors":["Aabeyir, R.","Adu-Bredu, S.","Agyare, W.A."],"year":2020,"venue":"Forest Ecosystems","doi":"10.1186/s40663-020-00250-3","url":"https://doi.org/10.1186/s40663-020-00250-3","read_url":"https://link.springer.com/article/10.1186/s40663-020-00250-3","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current"},"name":"Kintampo woodlands mixed-species AGB, M2: dbh and wood density","output":{"quantity":"agb"},"expression":"0.202 * rho * D^(2 * 1.205)","published":{"expression":"0.202 * WD * DBH^(2 * 1.205)","units":{"DBH":"cm","WD":"g/cm3"},"variables":{"DBH":"D","WD":"rho"},"output_unit":"kg"},"taxon":{"level":"mixed","name":"31 woodland tree species harvested for charcoal","group":"broadleaf"},"region":{"scope":"site","countries":["GH"],"place":"Kintampo Municipality, forest-savanna transition zone, Ghana","biomes":["tropical"]},"stand":"natural","fit":{"n_trees":745,"dbh_min_cm":5,"dbh_max_cm":48.2,"method":"non-linear regression (variance proportional to squared mean)"},"evidence":[{"field":"expression","quote":"M2 a2 0.202 0.166–0.238 0.162–0.242 b2 1.205 1.180–1.231","locator":"Table 5 (parameter estimates)"},{"field":"expression","quote":"M2 a2[ρ(dbh)^(2b2)]","locator":"Table 3 (model forms)"},{"field":"fit.n_trees","quote":"Destructive sampling was carried out on 745 trees","locator":"Abstract"},{"field":"fit.dbh_max_cm","quote":"The dbh of individual trees ranged from 5.0 to 48.2 cm","locator":"Modelling process, Data description"}],"check":[{"inputs":{"D":25,"rho":0.65},"expected":307.11,"origin":"computed","note":"hand-computed from the published form"},{"inputs":{"D":40,"rho":0.65},"expected":953.3,"origin":"computed","note":"hand-computed from the published form"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Mixed-species model; AGB is the sum of logs, small branches, twigs and leaves, so foliage is included. Fitted by non-linear regression, so no back-transformation correction. Wood density ρ is the species mean of disc samples (oven-dry mass / volume), in g/cm³. Coefficients are the Table 5 estimates rounded as printed."}