{"id":"coutinho-2018-trunk-sur","source":{"id":"coutinho-2018","citation":"Coutinho, V. M., Sanquetta, C. R., Bittencourt, P. A., Silva, S. A., Proceke, K. H., Delarrmelina, W. M., & Moreau, J. (2018). Simultaneous Equations to Estimate Aboveground Biomass of Pinus caribaea var. hondurensis. Floresta e Ambiente, 25(3), e20160452.","title":"Simultaneous Equations to Estimate Aboveground Biomass of Pinus caribaea var. hondurensis","authors":["Coutinho, V. M.","Sanquetta, C. R.","Bittencourt, P. A."],"year":2018,"venue":"Floresta e Ambiente","doi":"10.1590/2179-8087.045216","url":"https://doi.org/10.1590/2179-8087.045216","read_url":"http://www.scielo.br/pdf/floram/v25n3/2179-8087-floram-25-3-e20160452.pdf","access":"open","license":"CC BY (version not stated on the article page)","checked_at":"2026-11-02","status":"current"},"name":"Pinus caribaea trunk (stem with bark) biomass from DBH, height and wood density (simultaneous fit)","output":{"quantity":"stem_biomass"},"expression":"-41.5 + 1.760*D + 1.374*H + 39.377*rho","published":{"expression":"-41.5 + 1.760*DBH + 1.374*ht + 39.377*rho","units":{"DBH":"cm","ht":"m","rho":"g/cm3"},"variables":{"DBH":"D","ht":"H","rho":"rho"},"output_unit":"kg"},"taxon":{"level":"species","name":"Pinus caribaea var. hondurensis","family":"Pinaceae","group":"conifer"},"region":{"scope":"site","countries":["BR"],"place":"Experimental area of UESB, Vitória da Conquista, Bahia","biomes":["tropical","subtropical"]},"stand":"plantation","fit":{"n_trees":20,"dbh_min_cm":8.2,"dbh_max_cm":23.7,"h_min_m":6.4,"h_max_m":14.2,"r2":0.84,"method":"Simultaneous (SUR) linear regression ensuring additivity; R2 reported is adjusted R2"},"evidence":[{"field":"expression","quote":"bstrunk = β0+β1DBH+β2ht+β3ρ: -41.5, 1.760, 1.374, 39.377","locator":"Table 5"},{"field":"fit.n_trees","quote":"Twenty (20) trees from the experimental area of the State University of Southwest Bahia (UESB), Vitória da Conquista, Bahia, Brazil, were measured and weighed","locator":"Abstract"},{"field":"fit.dbh_min_cm","quote":"with a minimum value of 8.20 cm and a maximum of 23.70 cm; average total height of 11.06 m, ranging from 6.40 m to 14.20 m","locator":"Section 3 (Results)"},{"field":"fit.r2","quote":"R2adj 0.84","locator":"Table 5"}],"check":[{"inputs":{"D":12,"H":9,"rho":0.44},"expected":9.3119,"origin":"computed","note":"computed from the published form"},{"inputs":{"D":20,"H":13,"rho":0.5},"expected":31.2505,"origin":"computed","note":"computed from the published form"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Ten-year-old plantation, 3 m x 3 m spacing, 20 trees. The paper writes the height symbol as ht in this row (TH elsewhere) and gives wood density rho in g/cm3 (stand mean 0.44). Trunk is with bark. Fitted simultaneously (Table 5)."}