{"id":"nam-2016-eq10","source":{"id":"nam-2016","citation":"Nam, V.T., van Kuijk, M., Anten, N.P.R. (2016). Allometric Equations for Aboveground and Belowground Biomass Estimations in an Evergreen Forest in Vietnam. PLoS ONE, 11(6), e0156827.","title":"Allometric Equations for Aboveground and Belowground Biomass Estimations in an Evergreen Forest in Vietnam","authors":["Nam, V.T.","van Kuijk, M.","Anten, N.P.R."],"year":2016,"venue":"PLoS ONE","doi":"10.1371/journal.pone.0156827","url":"https://doi.org/10.1371/journal.pone.0156827","access":"open","license":"CC BY 4.0","checked_at":"2026-11-01","status":"current"},"name":"Vietnam evergreen forest AGB with DBH, height and wood density (Eq. 10)","output":{"quantity":"agb"},"expression":"1.030 * exp(-3.081 + 0.966 * ln(D^2 * H) + 0.305 * ln(rho))","published":{"expression":"1.030 * exp(-3.081 + 0.966 * ln(DBH^2 * H) + 0.305 * ln(WD))","units":{"DBH":"cm","H":"m","WD":"g/cm3"},"variables":{"DBH":"D","WD":"rho"},"output_unit":"kg"},"taxon":{"level":"mixed","name":"Mixed species of tropical evergreen forest (45 species)","group":"broadleaf"},"region":{"scope":"site","countries":["VN"],"place":"K'Bang district, Gia Lai province, Central Highlands, Vietnam","biomes":["tropical"]},"stand":"natural","fit":{"n_trees":300,"dbh_min_cm":1.8,"dbh_max_cm":115,"r2":0.986,"rse":0.245,"cf":1.03,"method":"OLS on ln-transformed data, adjusted R2 (Table 2 model 8)"},"evidence":[{"field":"expression","quote":"ln(AGB) = −3.081 + 0.966 ln(DBH²H) + 0.305 ln(WD)","locator":"Eq. 10"},{"field":"fit","quote":"8 ln(AGB) = a + hln(DBH2H) + cln(WD) 0.986 0.245 -841.2 19.8 1.030","locator":"Table 2, model 8"},{"field":"fit.n_trees","quote":"a total of 300 trees pertaining to 45 species","locator":"Methods"},{"field":"fit.dbh","quote":"AGB = exp(-3.051+0.966ln(DBH2H) +0.305ln(WD)) ... 300 ... 1.8–115.0 ... Vietnam","locator":"Table 5"}],"check":[{"inputs":{"D":30,"H":20,"rho":0.63},"expected":529.87,"origin":"computed","note":"hand-computed from the published form"},{"inputs":{"D":60,"H":30,"rho":0.63},"expected":2991.31,"origin":"computed","note":"hand-computed from the published form"}],"verification":"original_read","checked_at":"2026-11-01","notes":"Eq. 10 times the CF 1.030 from Table 2. The paper's Eq. 11 back-transformed form prints 'exp(3,051 + ... + 3.05 ln(WD))', a typo; Table 5 prints exp(-3.051 + 0.966 ln(DBH2H) + 0.305 ln(WD)), i.e. the CF folded into the intercept (ln 1.030 = 0.030). H is the felled stem length. Functional-group models (Eq. 12-15) have no printed CF and are not included."}