{"id":"monda-2015-bgb-m6","source":{"id":"monda-2015","citation":"Monda, Y., Kiyono, Y., Melling, L., Damian, C., & Chaddy, A. (2015). Allometric equations considering the influence of hollow trees: A case study for tropical peat swamp forest in Sarawak. TROPICS, 24(1), 11-22.","title":"Allometric equations considering the influence of hollow trees: A case study for tropical peat swamp forest in Sarawak","authors":["Monda, Y.","Kiyono, Y.","Melling, L."],"year":2015,"venue":"TROPICS","doi":"10.3759/tropics.24.11","url":"https://doi.org/10.3759/tropics.24.11","read_url":"https://www.jstage.jst.go.jp/article/tropics/24/1/24_11/_pdf","access":"open","checked_at":"2026-11-02","status":"current"},"name":"BGB Model 6 (DBH and [ln(DBH)]²), peat swamp forest Sarawak","output":{"quantity":"bgb"},"expression":"1.1267 * exp(-6.1049 + 3.9957 * ln(D) - 0.2322 * ln(D)^2)","published":{"expression":"1.1267 * exp(-6.1049 + 3.9957 * ln(DBH) - 0.2322 * ln(DBH)^2)","units":{"DBH":"cm"},"variables":{"DBH":"D"},"output_unit":"kg"},"taxon":{"level":"mixed","name":"Mixed tree species, tropical peat swamp forest","group":"broadleaf"},"region":{"scope":"site","countries":["MY"],"place":"Logged-over peat swamp forest, Sarawak (Alan Batu and other sites, PC1-PC3)","biomes":["tropical"]},"stand":"natural","fit":{"n_trees":32,"dbh_min_cm":5.2,"dbh_max_cm":110.8,"cf":1.1267,"method":"log-log regression of dry weight on ln-transformed predictors, back-transformed and multiplied by the correction factor CF = exp(RSE²/2)"},"evidence":[{"field":"expression","quote":"Model 6: ln(DW)＝a＋b ln(DBH)−e [ln(DBH)]2","locator":"Models section, p. 15"},{"field":"expression","quote":"Model 6 −6.1049 3.9957 *** 0.2322 ns 0.9544 1.1267 49.81 0.02378","locator":"Table 5, Belowground biomass, p. 19 (columns a, b, c, d, e, adjusted R2, CF, AIC, FI)"},{"field":"fit.n_trees","quote":"Belowground biomass (n＝32)","locator":"Table 5"},{"field":"fit.dbh_max_cm","quote":"BGB data for trees ranging in DBH from 5.2 to 110.8 cm","locator":"Discussion, p. 20"}],"check":[{"inputs":{"D":10},"expected":7.2698,"origin":"computed","note":"computed from the published form (coefficients and CF as printed)"},{"inputs":{"D":30},"expected":136.7883,"origin":"computed","note":"computed from the published form (coefficients and CF as printed)"},{"inputs":{"D":60},"expected":653.0439,"origin":"computed","note":"computed from the published form (coefficients and CF as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Coefficients a-e as printed in Table 5; the e term enters with a minus sign per the model definitions. WD is wood density in Mg m-3, numerically equal to g/cm3. Back-transformed result multiplied by the printed CF. Adjusted R2 0.9544 is not entered as r2. DW is dry mass (kg) of the whole above- or belowground part; hollow cavity volume was measured separately and the models are fitted to the measured biomass of hollow trees."}