{"id":"miyakuni-2004-branch-b-all-ages","source":{"id":"miyakuni-2004","citation":"Miyakuni, K., Heriansyah, I., Heriyanto, N. M., & Kiyono, Y. (2004). Allometric Biomass Equations, Biomass Expansion Factors and Root-to-shoot Ratios of Planted Acacia mangium Willd. Forests in West Java, Indonesia. Journal of Forest Planning, 10(2), 69-76.","title":"Allometric Biomass Equations, Biomass Expansion Factors and Root-to-shoot Ratios of Planted Acacia mangium Willd. Forests in West Java, Indonesia","authors":["Miyakuni, K.","Heriansyah, I.","Heriyanto, N. M."],"year":2004,"venue":"Journal of Forest Planning","doi":"10.20659/jfp.10.2_69","url":"https://doi.org/10.20659/jfp.10.2_69","read_url":"https://www.jstage.jst.go.jp/article/jfp/10/2/10_KJ00007911299/_pdf","access":"open","checked_at":"2026-11-02","status":"current"},"name":"Planted Acacia mangium, West Java, branch biomass from D, all ages (model B)","output":{"quantity":"branch_biomass"},"expression":"0.0046 * D^2.8669","published":{"expression":"0.0046 * dbh^2.8669","units":{"dbh":"cm"},"variables":{"dbh":"D"},"output_unit":"kg"},"taxon":{"level":"species","name":"Acacia mangium","family":"Fabaceae","group":"broadleaf"},"region":{"scope":"regional","countries":["ID"],"place":"Maribaya and Tenjo ranger districts (Parungpanjang), Perhutani, West Java","biomes":["tropical"]},"stand":"plantation","fit":{"n_trees":59,"r2":0.9359,"method":"log-linear least squares of Y = a·dbh^b"},"evidence":[{"field":"expression","quote":"Y = a·dbh^b; a = 0.0046, b = 2.8669, r2 = 0.9359","locator":"Table 3, model B, stand age 3-10"},{"field":"fit.n_trees","quote":"We selected 15 trees from the 3-year-old stand, 12 trees from the 5-year-old stand, 16 trees from the 8-year-old stand, and 16 trees from the 10-year-old stand","locator":"Destructive Sampling to Measure the Biomass of Individual Trees, p. 72"}],"check":[{"inputs":{"D":5},"expected":0.46412,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":10},"expected":3.3858,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":20},"expected":24.699,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Model B (the authors' recommended general equation): all four stand ages combined (3-10 yr). Fitted in log space (log-linear) and printed as a power law; the paper states no back-transformation correction factor and none is applied. The paper does not print the sampled dbh range. Branch biomass (Yb) includes dead branches still attached to the tree, as defined by the authors (p. 72)."}