{"id":"komiyama-2005-eq9-agb","source":{"id":"komiyama-2005","citation":"Komiyama, A., Poungparn, S., Kato, S. (2005). Common allometric equations for estimating the tree weight of mangroves. Journal of Tropical Ecology, 21(4), 471–477.","title":"Common allometric equations for estimating the tree weight of mangroves","authors":["Komiyama, A.","Poungparn, S.","Kato, S."],"year":2005,"venue":"Journal of Tropical Ecology","doi":"10.1017/S0266467405002476","url":"https://doi.org/10.1017/S0266467405002476","read_url":"http://web.archive.org/web/20240413003651id_/https://core.ac.uk/download/pdf/59148776.pdf","access":"paywalled","checked_at":"2026-11-01","status":"current","notes":"Read the Gifu University repository postprint (hdl.handle.net/20.500.12099/29819) via its archived CORE copy."},"name":"Common mangrove above-ground weight (Eq. 9)","output":{"quantity":"agb"},"expression":"0.251 * rho * D^2.46","published":{"expression":"0.251 * rho * D^2.46","units":{"rho":"g/cm3","D":"cm"},"output_unit":"kg"},"taxon":{"level":"mixed","name":"Mangroves (10 species: Rhizophora, Bruguiera, Ceriops, Avicennia, Sonneratia, Xylocarpus)","group":"mangrove"},"region":{"scope":"regional","countries":["TH","ID"],"place":"Mangrove forests of Thailand and Indonesia","biomes":["tropical","mangrove"]},"stand":"natural","fit":{"n_trees":104,"dbh_min_cm":5,"dbh_max_cm":48.9,"r2":0.979,"rse":0.085,"cf":1.017,"method":"log-log regression, CF applied (Table 4)"},"evidence":[{"field":"expression","quote":"Wtop = 0.251ρ D^2.46","locator":"Eq. 9, p. 475"},{"field":"fit","quote":"Wtop = 0.247ρ (D²)^1.23 0.979 0.085 1.017","locator":"Table 4 (equation before CF)"},{"field":"fit.n_trees","quote":"The tree samples were 104 individuals including 10 species.","locator":"Fig. 3 caption"}],"check":[{"inputs":{"D":20,"rho":0.8},"expected":318.64,"origin":"computed","note":"hand-computed from the published form"},{"inputs":{"D":40,"rho":0.7},"expected":1534.05,"origin":"computed","note":"hand-computed from the published form"}],"verification":"original_read","checked_at":"2026-11-01","notes":"Eq. 9 is Table 4's 0.247ρ(D²)^1.23 multiplied by CF 1.017. D = DR0.3 (diameter 30 cm above the highest prop root) for Rhizophoraceae and dbh for other species; Wtop excludes Rhizophora prop roots. ρ is wood density in t/m3 (= g/cm3). Trees with D > 5 cm."}