{"id":"prado-1991-branches-d-d2h","source":{"id":"prado-1991","citation":"Prado Donoso, J. A., & Alarcón Maya, C. (1991). Funciones de biomasa de Eucalyptus globulus ssp. globulus en la región costera central. Ciencia e Investigación Forestal, 5(1).","title":"Funciones de biomasa de Eucalyptus globulus ssp. globulus en la región costera central","authors":["Prado Donoso, J. A.","Alarcón Maya, C."],"year":1991,"venue":"Ciencia e Investigación Forestal","doi":"10.52904/0718-4646.1991.147","url":"https://doi.org/10.52904/0718-4646.1991.147","read_url":"https://revista.infor.cl/index.php/infor/article/download/147/140","access":"open","checked_at":"2026-11-02","status":"current"},"name":"Eucalyptus globulus branch (>4 cm) dry weight (Cuadro 2)","output":{"quantity":"branch_biomass"},"expression":"17.912236 - 3.17988 * D + 0.00316 * (D^2 * H)","published":{"expression":"17.912236 - 3.17988 * DAP + 0.00316 * (DAP^2 * H)","units":{"DAP":"cm","H":"m"},"variables":{"DAP":"D"},"output_unit":"kg"},"taxon":{"level":"species","name":"Eucalyptus globulus subsp. globulus","family":"Myrtaceae","group":"broadleaf"},"region":{"scope":"regional","countries":["CL"],"place":"Coastal zone of Valparaíso Region (Longotoma, Peñuelas, Santa Marta), central Chile","biomes":["temperate"]},"stand":"plantation","fit":{"n_trees":41,"r2":0.73,"method":"stepwise linear regression on dry weight (Cuadro 2)"},"evidence":[{"field":"expression","quote":"PRAM = 17,912236 - 3,17988 D + 0,00316 (D²H)","locator":"Cuadro 2, RAMAS (> 4cm) row, p. 64"},{"field":"fit.n_trees","quote":"se utilizó una muestra de 41 árboles extraídos de tres parcelas","locator":"Metodos, Muestreo, p. 60"},{"field":"fit.r2","quote":"RAMAS (> 4cm) ... 0,73","locator":"Cuadro 2, R² column, p. 64"}],"check":[{"inputs":{"D":20,"H":20},"expected":-20.4054,"origin":"computed","note":"hand-computed from the Cuadro 2 form"},{"inputs":{"D":35,"H":25},"expected":3.3914,"origin":"computed","note":"hand-computed from the Cuadro 2 form"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Branches thicker than 4 cm only (twigs and leaves are separate components). Very imprecise: the authors report a 89.7% mean square error and advise taking branches by difference. Trees from three unmanaged 20-25 year old coppice-origin (monte alto) stands. The paper does not print DBH or height ranges of the fitted sample, only a table of diameter classes, so none is given. H is read as total height (HTOT): the paper's own stand-table comparison feeds DAP and HT into these functions. No correction factor is stated for the log models, so none applies here. Not additive with the other component functions, as the authors note."}