{"id":"cuevas-2020-s2-branch","source":{"id":"cuevas-2020","citation":"Cuevas Cruz, J. C., & Aquino Ramírez, M. (2020). Ecuaciones de aditividad para la estimación de biomasa aérea de Pinus cembroides Zucc. Madera y Bosques, 26(1), e2611821.","title":"Ecuaciones de aditividad para la estimación de biomasa aérea de Pinus cembroides Zucc.","authors":["Cuevas Cruz, J. C.","Aquino Ramírez, M."],"year":2020,"venue":"Madera y Bosques","doi":"10.21829/myb.2020.2611821","url":"https://doi.org/10.21829/myb.2020.2611821","read_url":"https://myb.ojs.inecol.mx/index.php/myb/article/download/e2611821/2042","access":"open","license":"CC BY-NC-SA 4.0","checked_at":"2026-11-02","status":"current","notes":"System S1 (D²H form) not added: Table 1 prints positive intercepts (e.g. 2.766848) that give implausible biomass as written."},"name":"Pinus cembroides, additive system S2 (D and H): branch biomass","output":{"quantity":"branch_biomass"},"expression":"exp(-5.193296) * D^2.36942 * H^1.11539","published":{"expression":"exp(-5.193296) * Dn^2.36942 * H^1.11539","units":{"H":"m","Dn":"cm"},"variables":{"Dn":"D"},"output_unit":"kg"},"taxon":{"level":"species","name":"Pinus cembroides Zucc.","family":"Pinaceae","group":"conifer"},"region":{"scope":"site","countries":["MX"],"place":"Sombrerete, Cadereyta de Montes, Querétaro (bosque de pino, 2600 m)","biomes":["dryland"]},"stand":"natural","fit":{"n_trees":21,"dbh_min_cm":3,"dbh_max_cm":40,"h_min_m":1.2,"h_max_m":9.4,"method":"Additive nonlinear system of component equations fitted simultaneously by generalized method of moments (GMM)"},"evidence":[{"field":"expression","quote":"Br = exp(−5.1933) × Dn^2.3694 × H^1.1154; Table 1, S2 Ramas: β20 −5.193296, β21 2.36942, β23 1.11539","locator":"Fig. 2b, Table 1 (S2)"},{"field":"fit.n_trees","quote":"un total de 21 árboles","locator":"Resumen / Resultados"}],"check":[{"inputs":{"D":14.1,"H":3.7},"expected":12.6279,"origin":"computed","note":"computed from the published form (Fig. 2 and Table 1 coefficients)"},{"inputs":{"D":28.9,"H":6.9},"expected":138.581,"origin":"computed","note":"computed from the published form (Fig. 2 and Table 1 coefficients)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"System S2 (Eq. 7-10, B = exp[β0] × Dn^β1 × H^β2) fitted by GMM. Table 1 labels the H exponents β13, β23, β33 (read as β12, β22, β32). Table 1 prints the twig-and-leaf intercept β30 as 2.07281 (no minus) while Fig. 2c prints exp(−2.0728); the negative sign is used because the positive one gives hundreds of times the observed biomass. Adjusted R2 (not stored): stem 0.9704, branches 0.9476, twigs with leaves 0.9294, total 0.9802."}