{"id":"huy-2016-m3-d-rho","source":{"id":"huy-2016","citation":"Huy, B., Poudel, K. P., Kralicek, K., Hung, N. D., Khoa, P. V., Phuong, V. T., & Temesgen, H. (2016). Allometric Equations for Estimating Tree Aboveground Biomass in Tropical Dipterocarp Forests of Vietnam. Forests, 7(8), 180.","title":"Allometric Equations for Estimating Tree Aboveground Biomass in Tropical Dipterocarp Forests of Vietnam","authors":["Huy, B.","Poudel, K. P.","Kralicek, K."],"year":2016,"venue":"Forests","doi":"10.3390/f7080180","url":"https://doi.org/10.3390/f7080180","read_url":"https://www.mdpi.com/1999-4907/7/8/180/htm","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current"},"name":"Dipterocarp forests Vietnam, mixed-species AGB from D and wood density (M3)","output":{"quantity":"agb"},"expression":"0.07126 * D^2.6094 * rho^0.59275","published":{"expression":"0.07126 * DBH^2.60940 * WD^0.59275","units":{"DBH":"cm","WD":"g/cm3"},"variables":{"DBH":"D","WD":"rho"},"output_unit":"kg"},"taxon":{"level":"mixed","name":"Mixed species, dipterocarp forest (26 species)","group":"broadleaf"},"region":{"scope":"regional","countries":["VN"],"place":"Dipterocarp forests, Central Highlands and Southeast ecoregions, Vietnam","biomes":["tropical"]},"stand":"natural","fit":{"n_trees":222,"dbh_min_cm":3.4,"dbh_max_cm":48.8,"h_min_m":2.5,"h_max_m":23.5,"method":"nonlinear weighted least squares (power variance function)"},"evidence":[{"field":"expression","quote":"M3 DBH, WD AGB = a × DBHb × WDc; a 0.07126, b 2.60940, c 0.59275","locator":"Table 4"},{"field":"fit.n_trees","quote":"A total of 222 trees were destructively sampled","locator":"Section 2.2"},{"field":"fit.dbh_min_cm","quote":"Min 3.4 / Max 48.8 (DBH, Mixed-Species)","locator":"Table 2"}],"check":[{"inputs":{"D":10,"rho":0.55},"expected":20.34,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":20,"rho":0.65},"expected":137.04,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":40,"rho":0.75},"expected":910.34,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"AGB is the sum of stem, branch and foliage dry mass. Fitted on the whole dataset with the fixed-effects model; the random ecoregion effect was not retained. No correction factor is stated. The standard error printed for c in Table 4 equals the estimate itself and looks like a typo; it is not used."}