{"id":"ruiz-aquino-2014-laurina-agb","source":{"id":"ruiz-aquino-2014","citation":"Ruiz-Aquino, F., Valdez-Hernández, J. I., Manzano-Méndez, F., Rodríguez-Ortiz, G., Romero-Manzanares, A., & Fuentes-López, M. E. (2014). Ecuaciones de biomasa aérea para Quercus laurina y Q. crassifolia en Oaxaca. Madera y Bosques, 20(2), 33-48.","title":"Ecuaciones de biomasa aérea para Quercus laurina y Q. crassifolia en Oaxaca","authors":["Ruiz-Aquino, F.","Valdez-Hernández, J. I.","Manzano-Méndez, F."],"year":2014,"venue":"Madera y Bosques","doi":"10.21829/myb.2014.202162","url":"https://doi.org/10.21829/myb.2014.202162","read_url":"https://myb.ojs.inecol.mx/index.php/myb/article/download/162/213","access":"open","checked_at":"2026-11-02","status":"current","notes":"Other candidate models of the paper (Eq. 3, 5-8; Tables 4-5) were not added; only the authors' chosen Eq. 4."},"name":"Quercus laurina, total aboveground biomass (Eq. 4, D²H)","output":{"quantity":"agb"},"expression":"exp(-4.3375 + 1.076 * ln(D^2 * H))","published":{"expression":"exp(-4.3375 + 1.076 * ln(DN^2 * AT))","units":{"DN":"cm","AT":"m"},"variables":{"DN":"D","AT":"H"},"output_unit":"kg"},"taxon":{"level":"species","name":"Quercus laurina Humb. & Bonpl.","family":"Fagaceae","group":"broadleaf"},"region":{"scope":"site","countries":["MX"],"place":"Ixtlán de Juárez, Oaxaca","biomes":["temperate"]},"stand":"natural","fit":{"n_trees":16,"dbh_min_cm":6,"dbh_max_cm":31,"h_min_m":9.6,"h_max_m":25.5,"method":"Nonlinear exponential model (Eq. 4) fitted by SAS PROC MODEL; no correction factor stated"},"evidence":[{"field":"expression","quote":"y = e^[−β0+β1 ln(DN²×AT)] (4); β0 = 4,3375, β1 = 1,076","locator":"Table 4, Eq. 4"},{"field":"fit.n_trees","quote":"Se muestrearon 16 árboles por cada especie","locator":"Resumen / Table 2"}],"check":[{"inputs":{"D":13.5,"H":14.4},"expected":62.3913,"origin":"computed","note":"computed from the published form (Tables 4-7 coefficients, minus sign on β0)"},{"inputs":{"D":23.5,"H":20.7},"expected":303.927,"origin":"computed","note":"computed from the published form (Tables 4-7 coefficients, minus sign on β0)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"The paper prints the model as e^[−β0 + β1 ln(DN² × AT)] with the tabulated β0 positive; applied with the minus sign (it also matches the paper's biomass expansion factor Eq. 12). Dry mass at 100 °C; stem includes bark. Adjusted R2 (not stored): 0.9914."}