{"id":"gaui-2024-general-model3","source":{"id":"gaui-2024","citation":"Gaui, T. D., Cysneiros, V. C., de Souza, F. C., et al. (2024). Biomass Equations and Carbon Stock Estimates for the Southeastern Brazilian Atlantic Forest. Forests, 15(9), 1568.","title":"Biomass Equations and Carbon Stock Estimates for the Southeastern Brazilian Atlantic Forest","authors":["Gaui, T. D.","Cysneiros, V. C.","de Souza, F. C."],"year":2024,"venue":"Forests","doi":"10.3390/f15091568","url":"https://doi.org/10.3390/f15091568","read_url":"https://www.mdpi.com/1999-4907/15/9/1568/htm","access":"open","checked_at":"2026-11-02","status":"current"},"name":"All three forest types, Rio de Janeiro (local-generic), DBH and height (Schumacher and Hall, Model 3)","output":{"quantity":"agb","excludes":["foliage"]},"expression":"1000 * 0.0002 * D^1.519 * H^0.8251","published":{"expression":"0.0002 * DBH^1.519 * Ht^0.8251","units":{"DBH":"cm","Ht":"m"},"variables":{"DBH":"D","Ht":"H"},"output_unit":"Mg"},"taxon":{"level":"mixed","name":"Mixed Atlantic Forest trees (rainforest, semideciduous, restinga)","group":"broadleaf"},"region":{"scope":"regional","countries":["BR"],"place":"Rio de Janeiro state, Atlantic Forest Domain","biomes":["tropical","subtropical"]},"stand":"natural","fit":{"n_trees":172,"r2":0.92,"method":"non-linear regression, generalised least squares with varPower variance"},"evidence":[{"field":"expression","quote":"Model 3 (Schumacher and Hall) General: B0 2 × 10−4, B1 1.519, B2 0.8251","locator":"Table 2 (model forms in Table 1)"},{"field":"fit.n_trees","quote":"172 trees","locator":"Section 2.3"}],"check":[{"inputs":{"D":15,"H":12},"expected":95.0485,"origin":"computed","note":"hand-computed from the published form (Mg x 1000 = kg)"},{"inputs":{"D":40,"H":22},"expected":695.332,"origin":"computed","note":"hand-computed from the published form (Mg x 1000 = kg)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Table 2 gives coefficients only; the model forms are from Table 1 (Husch y = B0 d^B1; Spurr y = B0 + B1 (d2 h); Schumacher and Hall y = B0 d^B1 h^B2), fitted by non-linear GLS with a varPower variance function. Output unit Mg is from the Figure 2 caption (AGB, Mg); the table itself does not state it, and 1000 x converts to kg. AGB was built from non-destructively measured wood volume (stem and branches) times basic wood density, so foliage is excluded. Coefficients are rounded as printed. Fit r2 is the printed Ryy (correlation of real and estimated values). DBH range of the 172 sample trees not stated. Authors judged Model 3 best for this data set."}