{"id":"cuevas-2022-s2-agb","source":{"id":"cuevas-2022","citation":"Cuevas Cruz, J. C., Aquino Ramírez, M., Kú Chalé, R. de la C., & Morales Sosa, I. J. (2022). Ecuaciones alométricas aditivas para estimar biomasa aérea y concentración de carbono de Piscidia piscipula (L.) Sarg. Madera y Bosques, 28(3), e2832356.","title":"Ecuaciones alométricas aditivas para estimar biomasa aérea y concentración de carbono de Piscidia piscipula (L.) Sarg.","authors":["Cuevas Cruz, J. C.","Aquino Ramírez, M.","Kú Chalé, R. de la C."],"year":2022,"venue":"Madera y Bosques","doi":"10.21829/myb.2022.2832356","url":"https://doi.org/10.21829/myb.2022.2832356","read_url":"https://myb.ojs.inecol.mx/index.php/myb/article/download/2356/2424","access":"open","license":"CC BY-NC-SA 4.0","checked_at":"2026-11-02","status":"current"},"name":"Piscidia piscipula, additive system S2 (D²H, Eq. 7-10): total aboveground biomass (sum of components)","output":{"quantity":"agb"},"expression":"(exp(-3.45213 + 0.943879 * ln(D^2 * H))) + (exp(-4.00219 + 0.950832 * ln(D^2 * H))) + (exp(-5.14483 + 0.790513 * ln(D^2 * H)))","published":{"expression":"(exp(-3.45213 + 0.943879 * ln(Dn^2 * AT))) + (exp(-4.00219 + 0.950832 * ln(Dn^2 * AT))) + (exp(-5.14483 + 0.790513 * ln(Dn^2 * AT)))","units":{"AT":"m","Dn":"cm"},"variables":{"Dn":"D","AT":"H"},"output_unit":"kg"},"taxon":{"level":"species","name":"Piscidia piscipula (L.) Sarg.","family":"Fabaceae","group":"broadleaf"},"region":{"scope":"site","countries":["MX"],"place":"Escárcega, Campeche (selva mediana subperennifolia)","biomes":["tropical"]},"stand":"natural","fit":{"n_trees":17,"dbh_min_cm":5.7,"dbh_max_cm":55,"h_min_m":8.12,"h_max_m":21,"method":"Additive nonlinear system of component equations fitted simultaneously by generalized method of moments (GMM)"},"evidence":[{"field":"expression","quote":"Bt = Σ e^[−βi0+βi1 ln(Dn² AT)] + ε4 (10)","locator":"Eq. 10"},{"field":"expression","quote":"Bf = e^[−β10+β11 ln(Dn² AT)] + ε1 (7); Table 2, S2 Fuste: β10 3.45213, β11 0.943879","locator":"Eq. 7, Table 2 (S2)"},{"field":"expression","quote":"Br = e^[−β20+β21 ln(Dn² AT)] + ε2 (8); Table 2, S2 Ramas: β20 4.00219, β21 0.950832","locator":"Eq. 8, Table 2 (S2)"},{"field":"expression","quote":"Brh = e^[−β30+β31 ln(Dn² AT)] + ε3 (9); Table 2, S2 Ramillas con hojas: β30 5.14483, β31 0.790513","locator":"Eq. 9, Table 2 (S2)"},{"field":"fit.n_trees","quote":"destructivo de 17 individuos","locator":"Resumen / Table 1"}],"check":[{"inputs":{"D":20.5,"H":12},"expected":164.536,"origin":"computed","note":"computed from the published form (Table 2 coefficients, intercept with the printed minus sign)"},{"inputs":{"D":40.2,"H":17.1},"expected":817.475,"origin":"computed","note":"computed from the published form (Table 2 coefficients, intercept with the printed minus sign)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"The paper prints the intercept as a positive estimate and the model with a minus sign in front of it (e^[−β0 + ...]); applied that way. Adjusted R2 (not stored): stem 0.9821, branches 0.9769, twigs with leaves 0.8419, total 0.9931 (Table 3). Dn and AT are the paper's diameter at breast height and total height. Total is the sum of the component equations, as the paper defines it."}