{"id":"rufini-2010-sh-r23-fvol-nobark","source":{"id":"rufini-2010","citation":"Rufini, A.L., Scolforo, J.R.S., Oliveira, A.D. de, Mello, J.M. de (2010). Equações volumétricas para o cerrado sensu stricto, em Minas Gerais. CERNE, 16(1), 1-11.","title":"Equações volumétricas para o cerrado sensu stricto, em Minas Gerais","authors":["Rufini, A.L.","Scolforo, J.R.S.","Oliveira, A.D. de"],"year":2010,"venue":"CERNE","doi":"10.1590/s0104-77602010000100001","url":"https://doi.org/10.1590/s0104-77602010000100001","read_url":"https://www.scielo.br/j/cerne/a/n7hz4jCWRWRnMgBGSCpD8Vp/?lang=pt&format=pdf","access":"open","checked_at":"2026-11-02","status":"current"},"name":"Cerrado s.s. MG, Stem volume without bark, Schumacher-Hall log, regions 2 and 3 pooled","output":{"quantity":"stem_volume"},"expression":"exp(-10.0185310695 + 1.595186012 * ln(D) + 1.256733019 * ln(H))","published":{"expression":"exp(-10.0185310695 + 1.595186012 * ln(Dap) + 1.256733019 * ln(H))","units":{"Dap":"cm","H":"m"},"variables":{"Dap":"D"},"output_unit":"m3"},"taxon":{"level":"mixed","name":"Cerrado sensu stricto tree species (mixed)","group":"mixed"},"region":{"scope":"regional","countries":["BR"],"place":"Minas Gerais, Sao Francisco river basin, SF 5, 6, 10 and SF 7, 8, 9 sub-basins (regions 2 and 3 pooled)","biomes":["tropical","dryland"]},"stand":"natural","fit":{"r2":0.9681,"method":"log-transformed linear regression (Schumacher-Hall log) on pooled Huber rigorous cubing data, regions 2 and 3 (identity test accepted)"},"evidence":[{"field":"expression","quote":"Ln(VFsc) = -10,0185310695 + 1,595186012 * Ln(Dap) + 1,256733019 * Ln(H)","locator":"Table 2, combination 23"},{"field":"fit.r2","quote":"96,81 (R2 %)","locator":"Table 2, combination 23"}],"check":[{"inputs":{"D":5,"H":3},"expected":0.00230998,"origin":"computed","note":"hand-computed from the published form (coefficients as printed)"},{"inputs":{"D":10,"H":5},"expected":0.0132621,"origin":"computed","note":"hand-computed from the published form (coefficients as printed)"},{"inputs":{"D":20,"H":8},"expected":0.0723328,"origin":"computed","note":"hand-computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Pooled fit for regions 2 and 3 after the Graybill identity test found them similar. n for the pooled fit is not printed and is left out. Dap, H and volume units are not spelled out beside the model; read as Dap in cm, H in m, volume in m3 (consistent magnitudes). No back-transformation correction factor is stated, so none is applied. R2 printed as a percentage."}