{"id":"aabeyir-2020-m6","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, M6 (best model): dbh, height and wood density","output":{"quantity":"agb"},"expression":"0.0580 * rho * (D^2 * H)^0.999","published":{"expression":"0.0580 * WD * (DBH^2 * HT)^0.999","units":{"DBH":"cm","HT":"m","WD":"g/cm3"},"variables":{"DBH":"D","HT":"H","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":"M6 a6 0.058 0.049–0.067 0.046–0.070 b6 0.999 0.983–1.015","locator":"Table 5 (parameter estimates)"},{"field":"expression","quote":"M6 a6[ρ((dbh)^2H)^b6]","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"},{"field":"expression","quote":"AGB = 0.0580ρ((dbh)2H)0.999","locator":"Abstract"}],"check":[{"inputs":{"D":25,"H":12,"rho":0.65},"expected":280.24,"origin":"computed","note":"hand-computed from the published form"},{"inputs":{"D":40,"H":12,"rho":0.65},"expected":716.74,"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. Abstract prints a6 as 0.0580; Table 5 prints 0.058. The abstract value is used."}