{"id":"santos-2022-stem-all","source":{"id":"santos-2022","citation":"Santos, M. L., Leite, H. G., Cavalcante, V. S., Fernandes, L. V., and Neves, J. C. L. (2022). Allometric equations for biomass and contents of macronutrients in a young Tectona grandis stand. Revista Brasileira de Ciência do Solo, 46, e0220030.","title":"Allometric equations for biomass and contents of macronutrients in a young Tectona grandis stand","authors":["Santos, M. L.","Leite, H. G.","Cavalcante, V. S.","Fernandes, L. V.","Neves, J. C. L."],"year":2022,"type":"journal-article","venue":"Revista Brasileira de Ciência do Solo","doi":"10.36783/18069657rbcs20220030","url":"https://doi.org/10.36783/18069657rbcs20220030","read_url":"https://www.rbcsjournal.org/wp-content/uploads/articles_xml/1806-9657-rbcs-46-e0220030/1806-9657-rbcs-46-e0220030.pdf","access":"open","license":"Creative Commons Attribution License","checked_at":"2026-11-05","status":"current"},"name":"Teak stem biomass, all sampled stands (DBS)","output":{"quantity":"stem_biomass"},"expression":"exp(-3.5188 + 2.6036 * ln(D))","published":{"expression":"exp(-3.5188 + 2.6036 * ln(DBH))","units":{"DBH":"cm"},"variables":{"DBH":"D"},"output_unit":"kg"},"taxon":{"level":"species","name":"Tectona grandis","group":"broadleaf"},"region":{"scope":"site","countries":["BR"],"place":"Mato Grosso, Brazil","biomes":[]},"stand":"plantation","fit":{"n_trees":18,"r2":0.9967,"method":"log-linear regression"},"evidence":[{"field":"expression","quote":"LnY = β₀ + β₁ Lndbh + ε; β₀ = −3.5188, β₁ = 2.6036","locator":"Table 2, model in caption; DBS row, All stands columns β₀ and β₁, p. 5"},{"field":"expression","quote":"-3.5188     2.6036     0.9967","locator":"Table 2, DBS, All stands, p. 5"},{"field":"expression","quote":"ln Y = β0 + β1 ln DBH + ε (m1)","locator":"Materials and methods, p. 4"},{"field":"output","quote":"Estimates of the dry biomass of aerial part – DBAP (a), stem – DBS (b), wood – DBW (c)","locator":"Figure 2 caption, p. 7"},{"field":"published.units","quote":"DBH (cm)","locator":"Figure 2 horizontal axis, p. 7"},{"field":"published.units","quote":"DBS (kg/tree)","locator":"Figure 2 vertical axis, p. 7"},{"field":"fit.n_trees","quote":"1) trees from all stands sampled (18 trees, 12 clonal and 6 seminal);","locator":"Materials and methods, data sets, p. 4"},{"field":"fit.r2","quote":"-3.5188     2.6036     0.9967","locator":"Table 2, DBS, All stands, p. 5"},{"field":"fit.method","quote":"The allometric model used was ln Y = β0 + β1 ln DBH + ε (m1)","locator":"Materials and methods, p. 4"},{"field":"taxon","quote":"young Tectona grandis stand","locator":"Title, p. 1"},{"field":"region","quote":"Mato Grosso, Brazil","locator":"Study area, p. 2"},{"field":"stand","quote":"teak plantations","locator":"Abstract, p. 1"}],"check":[{"inputs":{"D":15},"expected":34.18816404,"origin":"computed","note":"Calculated from the Table 2 log-linear form at DBH 15 cm."}],"verification":"original_read","doubt":"The all-stands curve in Figure 2(b) conflicts with its printed equation and Table 2: at DBH 20 cm, Table 2 predicts 72.30 kg, while the plotted curve is below 45 kg. This record uses Table 2; confirm the discrepancy with the authors before using it.","checked_at":"2026-11-05","notes":"DBH is measured at 1.3 m. The log-linear model is back-transformed using Table 2's printed coefficients; the paper gives no correction factor, so none is applied. Figure 2 prints the rounded power form 0.0296 * DBH^2.6036. The authors recommend the all-stands fit."}