{"id":"ambomo-tsanga-2026-tdwb-d","source":{"id":"ambomo-tsanga-2026","citation":"Ambomo Tsanga, F., Akodewou, A., Tapsou, J.-M., et al. (2026). Allometric models for estimating fuelwood and above-ground wood dry mass of pruned Faidherbia albida trees in northern Cameroon. Bois et Forêts des Tropiques, 363, 1-17.","title":"Allometric models for estimating fuelwood and above-ground wood dry mass of pruned Faidherbia albida trees in northern Cameroon","authors":["Ambomo Tsanga, F.","Akodewou, A.","Tapsou, J.-M."],"year":2026,"venue":"Bois et Forêts des Tropiques","doi":"10.19182/bft2026.363.a37930","url":"https://doi.org/10.19182/bft2026.363.a37930","read_url":"https://hal.science/hal-05751272v1/file/BFT363-2026-Ambomo%252BTsanga%252Bet%252Bal-1-17.pdf","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current"},"name":"Pruned Faidherbia albida total wood mass from DBH (Eq. 3.7)","output":{"quantity":"agb","excludes":["foliage"]},"expression":"1.06 * exp(-0.901 + 1.978 * ln(D))","published":{"expression":"1.06 * exp(-0.901 + 1.978 * ln(D))","units":{"D":"cm"},"output_unit":"kg"},"taxon":{"level":"species","name":"Faidherbia albida","family":"Fabaceae","group":"broadleaf"},"region":{"scope":"site","countries":["CM"],"place":"Gané and Sirlawé villages, Mayo-Danay, Far North region, Cameroon","biomes":["tropical","dryland"]},"stand":"agroforestry","fit":{"n_trees":18,"h_min_m":9,"h_max_m":14,"cf":1.06,"method":"log-log regression (OLS)"},"evidence":[{"field":"expression","quote":"Eq 3.7 ln(TDWb) = -0.901 + 1.978 * ln(D)","locator":"Table II, p. 10"},{"field":"fit.cf","quote":"Bias correction coefficient to transform predictions back to the original scale while accounting for the variance of the residuals.","locator":"Table II footnote 1, p. 10"},{"field":"fit.n_trees","quote":"the sample of 18 Faidherbia albida trees","locator":"Table I caption, p. 9"}],"check":[{"inputs":{"D":50},"expected":987.573,"origin":"computed","note":"computed from the Table II coefficients with the printed CF 1.06"},{"inputs":{"D":90},"expected":3158.6261,"origin":"computed","note":"computed from the Table II coefficients with the printed CF 1.06"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Response is TDWb, total above-ground wood dry mass (pruned wood plus post-pruning wood of trunk and branch stumps); foliage was not weighed, so it is excluded. Pruned-wood mass uses a 0.439 dry-matter fraction and post-pruning mass uses volume x 0.411 g cm-3 mean basic density, so it is a semi-destructive estimate. The back-transform applies the printed CF (1.06, given to two decimals). Natural log assumed from the paper's ln notation. DBH range not stored: Table I gives 31.8 to 110.4 cm but the text gives 28 to 183 cm for the 18 trees. Crown-area (Ca) equations from the same table are not added because Ca is not a canonical variable (computed as an ellipse area from two crown diameters)."}