{"id":"fonseca-2009-vochysia-guatemalensis-total","source":{"id":"fonseca-2009","citation":"Fonseca G., W., Alice G., F., & Rey B., J. M. (2009). Modelos para estimar la biomasa de especies nativas en plantaciones y bosques secundarios en la zona Caribe de Costa Rica. Bosque (Valdivia), 30(1), 36–47.","title":"Modelos para estimar la biomasa de especies nativas en plantaciones y bosques secundarios en la zona Caribe de Costa Rica","authors":["Fonseca G., W.","Alice G., F.","Rey B., J. M."],"year":2009,"venue":"Bosque (Valdivia)","doi":"10.4067/S0717-92002009000100006","url":"https://doi.org/10.4067/S0717-92002009000100006","read_url":"https://www.scielo.cl/pdf/bosque/v30n1/art06.pdf","access":"open","checked_at":"2026-11-01","status":"current"},"name":"Vochysia guatemalensis plantations, total tree biomass incl. roots (Bt)","output":{"quantity":"total_biomass"},"expression":"1.07 * exp(-1.44742 + 1.3308 * D^0.5)","published":{"expression":"1.07 * exp(-1.44742 + 1.3308 * d^0.5)","units":{"d":"cm"},"variables":{"d":"D"},"output_unit":"kg"},"taxon":{"level":"species","name":"Vochysia guatemalensis","family":"Vochysiaceae","group":"broadleaf"},"region":{"scope":"regional","countries":["CR"],"place":"Caribbean (Atlantic) lowlands of Costa Rica","biomes":["tropical"]},"stand":"plantation","fit":{"n_trees":51,"dbh_min_cm":0.5,"dbh_max_cm":40.5,"r2":0.9798,"rse":0.3682,"cf":1.07,"method":"OLS on ln(Bt) vs √d (Statgraphics); Sprugel correction factor"},"evidence":[{"field":"expression","quote":"Bt = exp(-1,44742 + 1,3308* d ^0,5) 97,98 0,3682 – 51 1,07","locator":"Cuadro 2, Vochysia guatemalensis (R2aj %, SEE, IF, n, FC)"},{"field":"fit.dbh_min_cm","quote":"en V. guatemalensis la muestra fue de 54 individuos con diámetros entre 0,5 y 40,5 cm","locator":"Métodos, p. 37"},{"field":"fit.cf","quote":"Los modelos seleccionados con transformaciones logarítmicas fueron corregidos utilizando un factor de corrección (FC)","locator":"Métodos, p. 39"},{"field":"output.quantity","quote":"biomasa total (Bt), que incluye todos los componentes del árbol","locator":"Resultados, p. 39"}],"check":[{"inputs":{"D":20},"expected":96.7139,"origin":"computed","note":"computed from the Cuadro 2 model times FC 1,07"}],"verification":"original_read","checked_at":"2026-11-01","notes":"Bt is whole-tree dry biomass including excavated roots (kg/tree), so the output is total (above + below) biomass, not AGB. FC = 1,07 (exp(SEE²/2)) is printed in its own column and multiplied in here. One mean-diameter tree harvested per plot, plantations 0,5–16 years old; r2 is adjusted R². Diameter range is for the 54 sampled trees; the Bt model used n = 51."}