{"id":"riofrio-2013-alnus-acuminata","source":{"id":"riofrio-2013","citation":"Riofrío, J., Herrero de Aza, C., Grijalva, J., & Bravo, F. (2013). Modelos para estimar la biomasa de especies forestales en sistemas agroforestales de la ecorregión andina del Ecuador. 6º Congreso Forestal Español, Vitoria-Gasteiz, Spain. Paper 6CFE01-023.","title":"Modelos para estimar la biomasa de especies forestales en sistemas agroforestales de la ecorregión andina del Ecuador","authors":["Riofrío, J.","Herrero de Aza, C.","Grijalva, J."],"year":2013,"venue":"6º Congreso Forestal Español (Sociedad Española de Ciencias Forestales)","url":"https://www.congresoforestal.es/actas/doc/6CFE/6CFE01-023.pdf","access":"open","checked_at":"2026-11-01","status":"current"},"name":"Alnus acuminata (aliso) AGB, sum of SUR component models (DBH, height)","output":{"quantity":"agb"},"expression":"0.347148 * D^2 + 0.003688 * D^2 * H - 1.267285 * H","published":{"expression":"0.1483*DBH^2 + 0.003688*DBH^2*Ht + 0.080183*DBH^2 - 0.569041*Ht + 0.085229*DBH^2 - 0.483528*Ht + 0.033436*DBH^2 - 0.214716*Ht","units":{"DBH":"cm","Ht":"m"},"variables":{"DBH":"D","Ht":"H"},"output_unit":"kg"},"taxon":{"level":"species","name":"Alnus acuminata","family":"Betulaceae","group":"broadleaf"},"region":{"scope":"regional","countries":["EC"],"place":"Two INIAP agroforestry systems, inter-Andean western cordillera of northern/central Ecuador, above 3000 m (Bosque Siempreverde Montano Alto)","biomes":["tropical","montane"]},"stand":"agroforestry","fit":{"n_trees":30,"dbh_min_cm":9.3,"dbh_max_cm":20.3,"h_min_m":6.8,"h_max_m":12.8,"r2":0.938,"method":"Component models (stem, coarse branches, thin branches, leaves) fitted simultaneously by seemingly unrelated regression (SUR); total = sum of components"},"evidence":[{"field":"expression","quote":"W f = 0,1483*DBH2+0,003688*DBH2*Ht","locator":"Tabla 4, Aliso, Fuste"},{"field":"expression","quote":"W rg = 0,080183*DBH2 - 0,569041*Ht","locator":"Tabla 4, Aliso, Ramas gruesas"},{"field":"expression","quote":"W rd = 0,085229DBH2 - 0,483528*Ht","locator":"Tabla 4, Aliso, Ramillas delgadas"},{"field":"expression","quote":"W h = 0,033436*DBH2 - 0,214716*Ht","locator":"Tabla 4, Aliso, Hojas"},{"field":"fit.r2","quote":"Biomasa total 9,72 0,938","locator":"Tabla 4, Aliso (RMSE kg, R2 ajustado)"},{"field":"fit.dbh_min_cm","quote":"Aliso 30 14,5 3,2 9,3 20,3 10,7 1,4 6,8 12,8","locator":"Tabla 1 (n, DBH mean SD min max, Ht mean SD min max)"}],"check":[{"inputs":{"D":14.5,"H":10.7},"expected":67.7247,"origin":"computed","note":"computed from the sum of published components at the sample means (observed mean Wt 71,1 kg, Tabla 1)"},{"inputs":{"D":20,"H":12},"expected":141.3542,"origin":"computed","note":"computed from the sum of published components"}],"verification":"original_read","checked_at":"2026-11-01","notes":"Total aboveground dry biomass (kg) is the sum of the four additive SUR component equations in Tabla 4 (stem with bark, coarse branches 2–7 cm, thin branches <2 cm, leaves); the paper prints no single total equation. r2 is the adjusted R² of total biomass. Linear models, no log correction. The negative height terms make predictions unreliable for short, thick trees outside the fitted range. A journal version is Riofrío et al. (2015) Biomass and Bioenergy 80:252-259 (not read)."}