{"id":"sampaio-2005-aspidosperma-pyrifolium-dbh","source":{"id":"sampaio-2005","citation":"Sampaio, E. V. S. B., & Silva, G. C. (2005). Biomass equations for Brazilian semiarid caatinga plants. Acta Botanica Brasilica, 19(4), 935-943.","title":"Biomass equations for Brazilian semiarid caatinga plants","authors":["Sampaio, E. V. S. B.","Silva, G. C."],"year":2005,"venue":"Acta Botanica Brasilica","doi":"10.1590/s0102-33062005000400028","url":"https://doi.org/10.1590/s0102-33062005000400028","read_url":"https://www.scielo.br/j/abb/a/H7MJLqBYjHc4Bp63L6pyHsG/?lang=en&format=pdf","access":"open","checked_at":"2026-11-02","status":"current"},"name":"Aspidosperma pyrifolium, caatinga, DBH","output":{"quantity":"agb"},"expression":"0.3675 * D^1.8355","published":{"expression":"0.3675 * DBH^1.8355","units":{"DBH":"cm"},"variables":{"DBH":"D"},"output_unit":"kg"},"taxon":{"level":"species","name":"Aspidosperma pyrifolium","group":"broadleaf"},"region":{"scope":"site","countries":["BR"],"place":"Santaluz (Bahia) and Petrolina (Pernambuco), Depressão Sertaneja, Brazilian semiarid","biomes":["tropical","dryland"]},"stand":"natural","fit":{"n_trees":30,"r2":0.8527,"method":"power equation B = a*x^b (oven-dry aboveground biomass, kg)"},"evidence":[{"field":"expression","quote":"A. pyrifolium: 0.3675*DBH1.8355  R2 0.8527","locator":"Table 2, p. 938"},{"field":"fit.r2","quote":"R2 0.8527","locator":"Table 2, p. 938"},{"field":"fit.n_trees","quote":"Each species was represented by 30 individuals","locator":"Material and methods, p. 936"}],"check":[{"inputs":{"D":5},"expected":7.05045,"origin":"computed","note":"hand-computed from the published form"},{"inputs":{"D":15},"expected":52.963,"origin":"computed","note":"hand-computed from the published form"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Table 2 prints each equation as a*DGL^b or a*DBH^b with the exponent as superscript (flattened here with ^). Biomass is oven-dry aboveground plant biomass in kg (Table 2 title), diameters in cm. Wood dried at 60 C. Plants were cut at the base and the stump was included in the weighed biomass. Perimeters were converted to diameters assuming a circular shape; for branching below measuring height, branch areas were summed into one equivalent diameter. DGL is stem diameter at ground level, mapped to DRC. "}