{"id":"fonseca-2009-secondary-forest-roots","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":"Caribbean Costa Rica secondary forest (35 species), root biomass from DBH","output":{"quantity":"bgb"},"expression":"1.14 * exp(-3.98702 + 2.48739 * ln(D))","published":{"expression":"1.14 * exp(-3.98702 + 2.48739 * ln(d))","units":{"d":"cm"},"variables":{"d":"D"},"output_unit":"kg"},"taxon":{"level":"mixed","name":"Secondary forest trees, 35 species (highest-IVI species per diameter class)","group":"broadleaf"},"region":{"scope":"regional","countries":["CR"],"place":"Caribbean (Atlantic) lowlands of Costa Rica","biomes":["tropical"]},"stand":"natural","fit":{"n_trees":122,"dbh_min_cm":2.8,"dbh_max_cm":28.2,"r2":0.9125,"rse":0.5053,"cf":1.14,"method":"OLS on ln(Bra) vs ln(d); Sprugel correction factor"},"evidence":[{"field":"expression","quote":"Bra = exp(-3,98702 + 2,48739*ln(d)) 91,25 0,5053 – 122 1,14","locator":"Cuadro 2, Bosque secundario"},{"field":"fit.dbh_min_cm","quote":"En estos bosques la muestra fue de 160 árboles correspondientes a 35 especies, cuyo diámetro varió entre 2,8 cm y 28,2 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"}],"check":[{"inputs":{"D":15},"expected":17.814,"origin":"computed","note":"computed from the Cuadro 2 model times FC 1,14"}],"verification":"original_read","checked_at":"2026-11-01","notes":"Root (Bra) dry biomass per tree from excavated root systems, secondary forests 3–20 years old. FC = 1,14 multiplied in. The secondary-forest total-biomass model in Cuadro 2 is not included: it is printed as 'Log(Bt) = -1,80246 + 2,28927*ln(d)' with Log defined as base 10, which gives implausible values; the base is ambiguous."}