{"id":"mugasha-2016-agb-general-m10","source":{"id":"mugasha-2016","citation":"Mugasha, W.A., Mwakalukwa, E.E., Luoga, E., et al. (2016). Allometric Models for Estimating Tree Volume and Aboveground Biomass in Lowland Forests of Tanzania. International Journal of Forestry Research, 2016, 8076271.","title":"Allometric Models for Estimating Tree Volume and Aboveground Biomass in Lowland Forests of Tanzania","authors":["Mugasha, W.A.","Mwakalukwa, E.E.","Luoga, E."],"year":2016,"venue":"International Journal of Forestry Research","doi":"10.1155/2016/8076271","url":"https://doi.org/10.1155/2016/8076271","read_url":"https://onlinelibrary.wiley.com/doi/10.1155/2016/8076271","access":"open","checked_at":"2026-11-02","status":"current"},"name":"Tanzania lowland forest, Dindili and Rondo combined, D, H and wood density (model 10)","output":{"quantity":"agb"},"expression":"0.0873 * (rho * D^2 * H)^0.9458","published":{"expression":"0.0873 * (WD * DBH^2 * HT)^0.9458","units":{"WD":"g/cm3","DBH":"cm","HT":"m"},"variables":{"WD":"rho","DBH":"D","HT":"H"},"output_unit":"kg"},"taxon":{"level":"mixed","name":"Mixed lowland forest tree species","group":"broadleaf"},"region":{"scope":"regional","countries":["TZ"],"place":"Dindili (Morogoro) and Rondo (Lindi) lowland forests, Tanzania","biomes":["tropical"]},"stand":"natural","fit":{"n_trees":60,"r2":0.87,"method":"maximum-likelihood non-linear regression with variance function"},"evidence":[{"field":"expression","quote":"General 10 0.0873 0.9458 0.559 × dbh1.673 567.9 0.87 840.94","locator":"Table 5 (columns: a, b, c, error, RMSE, R2, AIC)"},{"field":"published.units","quote":"where Y is the volume (m3 tree−1) or biomass (kg tree−1); WD is wood basic density (g cm−3); a, b, and c are model parameters to be estimated.","locator":"Section 2.6.2"},{"field":"fit.n_trees","quote":"A total of 30 trees were selected from each site","locator":"Section 2.3"}],"check":[{"inputs":{"rho":0.6,"D":20,"H":15},"expected":201.63,"origin":"computed","note":"hand-computed from the published form"},{"inputs":{"rho":0.8,"D":50,"H":25},"expected":2428.3,"origin":"computed","note":"hand-computed from the published form"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Fitted by maximum-likelihood non-linear regression with a variance function, no back-transformation. Table 5 column \"R2\" is stored as r2. Total AGB is the sum of stump, stem, branches, twigs and leaves, so foliage is included. Wood density WD is the tree's sample-disc basic density (g/cm³). The rendered equation (10) shows \"Y^1 = a × (WD × dbh² × ht)^b\"; the superscript 1 on Y is read as a typesetting artefact."}