{"id":"basuki-2009-mixed-d-rho","source":{"id":"basuki-2009","citation":"Basuki, T.M., van Laake, P.E., Skidmore, A.K., Hussin, Y.A. (2009). Allometric equations for estimating the above-ground biomass in tropical lowland Dipterocarp forests. Forest Ecology and Management, 257(8), 1684–1694.","title":"Allometric equations for estimating the above-ground biomass in tropical lowland Dipterocarp forests","authors":["Basuki, T.M.","van Laake, P.E.","Skidmore, A.K."],"year":2009,"venue":"Forest Ecology and Management","doi":"10.1016/j.foreco.2009.01.027","url":"https://doi.org/10.1016/j.foreco.2009.01.027","read_url":"https://ris.utwente.nl/ws/files/305501505/1_s2.0_S0378112709000516_main.pdf","access":"open","checked_at":"2026-11-01","status":"current"},"name":"Lowland Dipterocarp forest, mixed species, DBH and wood density","output":{"quantity":"agb"},"expression":"1.047 * exp(-0.744 + 2.188 * ln(D) + 0.832 * ln(rho))","published":{"expression":"1.047 * exp(-0.744 + 2.188 * ln(DBH) + 0.832 * ln(WD))","units":{"DBH":"cm","WD":"g/cm3"},"variables":{"DBH":"D","WD":"rho"},"output_unit":"kg"},"taxon":{"level":"mixed","name":"Mixed species of lowland Dipterocarp forest","group":"broadleaf"},"region":{"scope":"site","countries":["ID"],"place":"Lowland mixed Dipterocarp forest, East Kalimantan, Indonesia","biomes":["tropical"]},"stand":"natural","fit":{"n_trees":122,"dbh_min_cm":6,"dbh_max_cm":200,"r2":0.97,"rse":0.303,"cf":1.047,"method":"OLS on ln-transformed data, adjusted r2"},"evidence":[{"field":"expression","quote":"ln(TAGB) = c + αln(DBH) + βln(WD) c −0.744 ... α 2.188 ... β 0.832 ... 0.970 0.303 26.51 1.047","locator":"Table 1"},{"field":"region","quote":"The data were collected in lowland mixed Dipterocarp forests in East Kalimantan, Indonesia.","locator":"Abstract"},{"field":"published.units","quote":"TAGB; total above-ground biomass based on dry weight (kg/tree), DBH: diameter at breast height (cm)","locator":"Table 1 note"}],"check":[{"inputs":{"D":30,"rho":0.6},"expected":554.87,"origin":"computed","note":"hand-computed from the published form"},{"inputs":{"D":80,"rho":0.6},"expected":4744.76,"origin":"computed","note":"hand-computed from the published form"}],"verification":"original_read","checked_at":"2026-11-01","notes":"ln-ln OLS; the authors back-transform with the correction factor (CF) listed in Table 1, which is applied here. Intercepts are negative in the printed table (checked on the rendered page; text extraction drops the sign). DBH measured at 1.30 m or above buttresses."}