{"id":"salas-2002-roble-v-d2h","source":{"id":"salas-2002","citation":"Salas Eljatib, C. (2002). Ajuste y validación de ecuaciones de volumen para un relicto del bosque de Roble-Laurel-Lingue. Bosque, 23(2), 81-92.","title":"Ajuste y validación de ecuaciones de volumen para un relicto del bosque de Roble-Laurel-Lingue","authors":["Salas Eljatib, C."],"year":2002,"venue":"Bosque","doi":"10.4067/s0717-92002002000200009","url":"https://doi.org/10.4067/s0717-92002002000200009","read_url":"https://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-92002002000200009","access":"open","license":"CC BY-NC-ND 4.0 (per SciELO Chile article page)","checked_at":"2026-11-02","status":"current"},"name":"Nothofagus obliqua (roble) total volume, ln v from ln(d²h) (Cuadro 5, Grupo 3)","output":{"quantity":"total_volume"},"expression":"exp(-9.918535 + 0.95733 * ln(D^2 * H))","published":{"expression":"exp(-9.918535 + 0.95733 * ln(d^2 * h))","units":{"d":"cm","h":"m"},"variables":{"d":"D","h":"H"},"output_unit":"m3"},"taxon":{"level":"species","name":"Nothofagus obliqua","family":"Nothofagaceae","group":"broadleaf"},"region":{"scope":"site","countries":["CL"],"place":"Predio Rucamanque, Temuco, Araucanía (38°39'S 72°35'W)","biomes":["temperate"]},"stand":"natural","fit":{"n_trees":107,"dbh_min_cm":11.5,"dbh_max_cm":121,"h_min_m":9.8,"h_max_m":53.5,"method":"ordinary least squares, ln(v) = b0 + b1 ln(d²h)"},"evidence":[{"field":"expression","quote":"Roble: Ln v = b0 + b1 Ln d²h; b0 = −9,918535; b1 = 0,95733","locator":"Cuadro 5 (Ecuaciones de volumen total de las especies de Rucamanque), Roble row; model form is modelo 9 of Cuadro 1, Ln(v) = b0 + b1 Ln d²h (Kawas 1978)"},{"field":"fit.n_trees","quote":"Grupo 3 Roble (n = 107)","locator":"Cuadro 3"},{"field":"fit.dbh_min_cm","quote":"d [cm] mínimo 11,5; máximo 121,0; h [m] mínimo 9,8; máximo 53,5","locator":"Cuadro 3, Grupo 3"}],"check":[{"inputs":{"D":20,"H":15},"expected":0.20388,"origin":"computed","note":"computed from the published form (coefficients as printed, natural log, no correction factor)"},{"inputs":{"D":45,"H":27},"expected":1.69068,"origin":"computed","note":"computed from the published form (coefficients as printed, natural log, no correction factor)"},{"inputs":{"D":90,"H":40},"expected":9.28635,"origin":"computed","note":"computed from the published form (coefficients as printed, natural log, no correction factor)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Table values are images on SciELO. Ln is the natural log (paper defines Ln as base neperiana). No back-transformation correction factor is printed, so none is applied. v is total over-bark volume obtained by non-destructive relascope cubing. Other groups (laurel-lingue-tepa, ulmo, tineo) need the diameter at 6 m (d6), which is not a canonical variable, and are not included. The reported R2a (0,985, Cuadro 5) is adjusted, so not entered as r2. Cuadro 2 is the covariance-analysis species matrix; the descriptive statistics by group are in Cuadro 3 and the recommended equations in Cuadro 5."}