{"id":"pathibang-2026-stem-exponential","source":{"id":"pathibang-2026","citation":"Pathibang, M.R., Ora, Y.A.N.R., Almuqu, A.A., et al. (2026). Allometric Biomass Equation Model of Sonneratia alba in Tanah Merah Mangrove Forest, Kupang, East Nusa Tenggara, Indonesia. Jurnal Penelitian Pendidikan IPA, 12(5), 906-915.","title":"Allometric Biomass Equation Model of Sonneratia alba in Tanah Merah Mangrove Forest, Kupang, East Nusa Tenggara, Indonesia","authors":["Pathibang, M.R.","Ora, Y.A.N.R.","Almuqu, A.A."],"year":2026,"venue":"Jurnal Penelitian Pendidikan IPA","doi":"10.29303/jppipa.v12i5.15100","url":"https://doi.org/10.29303/jppipa.v12i5.15100","read_url":"https://jppipa.unram.ac.id/index.php/jppipa/article/download/15100/10027","access":"open","checked_at":"2026-11-02","status":"current"},"name":"Sonneratia alba stem biomass, exponential model (D)","output":{"quantity":"stem_biomass"},"expression":"4.884 * exp(0.127 * D)","published":{"expression":"4.884 * exp(0.127 * D)","units":{"D":"cm"},"output_unit":"kg"},"taxon":{"level":"species","name":"Sonneratia alba","group":"mangrove"},"region":{"scope":"site","countries":["ID"],"place":"Tanah Merah Mangrove Forest, Kupang, East Nusa Tenggara","biomes":["tropical","mangrove"]},"stand":"natural","fit":{"n_trees":8,"r2":0.931,"method":"exponential model B = a e^(bD)"},"evidence":[{"field":"expression","quote":"Exponential B = 4.884e^(0.127D) 93.1% 0.193","locator":"Table 3, Exponential row"},{"field":"fit.n_trees","quote":"A total of 14 trees were felled to serve as measurement samples: 8 for model development and 6 for model validation.","locator":"Results and Discussion, p. 908"},{"field":"fit.r2","quote":"93.1%","locator":"Table 3, Exponential row"}],"check":[{"inputs":{"D":12},"expected":22.42,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":18},"expected":48.037,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":26},"expected":132.68,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Stand origin is not stated in the paper; classified natural from its reference to natural forest stands. Fitted on 8 of the 14 felled trees (the other 6 were held out for validation); the paper prints no DBH range for the fitting trees."}