{"id":"goussanou-2016-cassipourea-congoensis-stem-biomass-d","source":{"id":"goussanou-2016","citation":"Goussanou, C.A., Guendehou, S., Assogbadjo, A.E., Kaire, M., Sinsin, B., Cuni-Sanchez, A. (2016). Specific and generic stem biomass and volume models of tree species in a West African tropical semi-deciduous forest. Silva Fennica, 50(2), article id 1474.","title":"Specific and generic stem biomass and volume models of tree species in a West African tropical semi-deciduous forest","authors":["Goussanou, C.A.","Guendehou, S.","Assogbadjo, A.E."],"year":2016,"venue":"Silva Fennica","doi":"10.14214/sf.1474","url":"https://doi.org/10.14214/sf.1474","read_url":"https://silvafennica.fi/pdf/1474","access":"open","checked_at":"2026-11-02","status":"current","notes":"Read the full open PDF. Eight equations captured: the Dbh-only stem biomass models (Table 4) for the generic fit and for six of the eighteen species (T. superba, T. scleroxylon, K. senegalensis, A. zygia, C. congoensis, H. grandis), plus the generic Dbh-only stem volume model (Table 3). Not captured: the Dbh + stem-height models (H in the paper is stem height to crown base, not total height, so it is not the canonical H), the other twelve species, and the species volume models. Non-destructive sampling (diameters measured along standing trees, volume by truncated cones, times basic wood density)."},"name":"Cassipourea congoensis stem biomass from Dbh","output":{"quantity":"stem_biomass"},"expression":"exp(-2.25 + 2.56 * ln(D) + 0.02)","published":{"expression":"exp(-2.25 + 2.56 * ln(Dbh) + 0.02)","units":{"Dbh":"cm"},"variables":{"Dbh":"D"},"output_unit":"kg"},"taxon":{"level":"species","name":"Cassipourea congoensis","group":"broadleaf"},"region":{"scope":"site","countries":["BJ"],"place":"Lama forest reserve, southern Benin (semi-deciduous forest)","biomes":["tropical"]},"stand":"natural","fit":{"n_trees":28,"dbh_min_cm":2.8,"dbh_max_cm":22.4,"method":"ln-ln linear regression, back-transformed with exp(σ²/2) (printed σ²/2 is rounded to 2 decimals)"},"evidence":[{"field":"expression","quote":"C. congoensis –2.25*** (0.12) 2.56*** (0.06) 98.6 17 0.02 26","locator":"Eq. 3 and 5, p. 7; Table 4 (Model structure: ln(X) = x0 + x1ln(Dbh)), p. 10"},{"field":"fit.n_trees","quote":"Cassipourea congoensis 28 143 2.8–22.4","locator":"Table 1, p. 5 (number of sample trees)"},{"field":"fit.dbh_min_cm","quote":"Cassipourea congoensis 28 143 2.8–22.4","locator":"Table 1, p. 5 (Dbh range, cm)"}],"check":[{"inputs":{"D":20},"expected":230.23,"origin":"computed","note":"computed from the published form (coefficients as printed to 2 decimals)"},{"inputs":{"D":40},"expected":1357.7,"origin":"computed","note":"computed from the published form (coefficients as printed to 2 decimals)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Stem biomass only (stem = height to crown base); the authors say to multiply by a biomass expansion factor (IPCC 2006) to get aboveground biomass. Coefficients are printed to 2 decimals, so predictions are only as precise as that. σ²/2 is the paper's printed bias-correction term, added inside the exponent (Eq. 5); it is printed rounded to 2 decimals. Recommended-to-capture subset: species-specific Dbh-only biomass models for six species; the paper prefers species-specific models over the generic one. "}