{"id":"huynh-2022-eq3-d","source":{"id":"huynh-2022","citation":"Huynh, T., Lewis, T., Applegate, G., Pachas, A. N. A., & Lee, D. J. (2022). Allometric Equations to Estimate Aboveground Biomass in Spotted Gum (Corymbia citriodora Subspecies variegata) Plantations in Queensland. Forests, 13(3), 486.","title":"Allometric Equations to Estimate Aboveground Biomass in Spotted Gum (Corymbia citriodora Subspecies variegata) Plantations in Queensland","authors":["Huynh, T.","Lewis, T.","Applegate, G."],"year":2022,"venue":"Forests","doi":"10.3390/f13030486","url":"https://doi.org/10.3390/f13030486","read_url":"https://www.mdpi.com/1999-4907/13/3/486/htm","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current"},"name":"Spotted gum AGB from DBH (Eq. 3)","output":{"quantity":"agb"},"expression":"0.0822 * D^2.64134","published":{"expression":"0.0822 * D^2.64134","units":{"D":"cm"},"output_unit":"kg"},"taxon":{"level":"species","name":"Corymbia citriodora subsp. variegata","family":"Myrtaceae","group":"broadleaf"},"region":{"scope":"regional","countries":["AU"],"place":"Three plantation trials (451D, 451G, 13PHY), southeast Queensland","biomes":["subtropical"]},"stand":"plantation","fit":{"n_trees":52,"dbh_min_cm":11.8,"dbh_max_cm":42,"h_min_m":12.6,"h_max_m":32,"method":"weighted nonlinear regression (nlme)"},"evidence":[{"field":"expression","quote":"(3) 0.08220 2.64134 (α, β) for AGB = α × Dβ","locator":"Table 4, Eq. (3); form in Table 2"},{"field":"fit.n_trees","quote":"We destructively sampled and weighed 52 sample trees, ranging from 11.8 to 42.0 cm in diameter at breast height","locator":"Abstract"}],"check":[{"inputs":{"D":15},"expected":105.0337,"origin":"computed","note":"computed from the Table 4 parameter estimates"},{"inputs":{"D":30},"expected":655.3168,"origin":"computed","note":"computed from the Table 4 parameter estimates"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Weighted nonlinear power model, so no back-transform correction applies. AGB is the total of stem, bark, large branches, small branches and leaves (Table 3), so foliage is included. Adjusted R² is printed in Table 4 but is not stored. The authors recommend this model (lowest cross-validated AIC, bias and MAPE)."}