{"id":"monda-2015-agb-m4","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":"AGB Model 4 (DBH, WD and [ln(DBH)]²), peat swamp forest Sarawak","output":{"quantity":"agb"},"expression":"1.0452 * exp(-3.1574 + 3.7215 * ln(D) + 0.4931 * ln(rho) - 0.2618 * ln(D)^2)","published":{"expression":"1.0452 * exp(-3.1574 + 3.7215 * ln(DBH) + 0.4931 * ln(WD) - 0.2618 * ln(DBH)^2)","units":{"DBH":"cm","WD":"g/cm3"},"variables":{"DBH":"D","WD":"rho"},"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":41,"dbh_min_cm":5.2,"dbh_max_cm":97,"cf":1.0452,"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 4: ln(DW)＝a＋b ln(DBH)＋d ln(WD)−e [ln(DBH)]2","locator":"Models section, p. 15"},{"field":"expression","quote":"Model 4 −3.1574 3.7215 *** 0.4931 ns 0.2618 ** 0.9699 1.0452 22.74 0.00303","locator":"Table 5, Aboveground biomass, p. 19 (columns a, b, c, d, e, adjusted R2, CF, AIC, FI)"},{"field":"fit.n_trees","quote":"Aboveground biomass (n＝41)","locator":"Table 5"},{"field":"fit.dbh_max_cm","quote":"AGB data were obtained for trees ranging in DBH from 5.2 to 97.0 cm","locator":"Discussion, p. 20"}],"check":[{"inputs":{"D":10,"rho":0.5},"expected":41.5148,"origin":"computed","note":"computed from the published form (coefficients and CF as printed)"},{"inputs":{"D":30,"rho":0.6},"expected":525.2825,"origin":"computed","note":"computed from the published form (coefficients and CF as printed)"},{"inputs":{"D":60,"rho":0.55},"expected":1703.4189,"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 0.9699 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."}