{"id":"qirom-2020-all-species-d","source":{"id":"qirom-2020","citation":"Qirom, M. A., & Akbar, A. (2020). Model Volume Kelompok Jenis Pohon pada Hutan Rawa Gambut di IUPHHK PT. Tingang Karya Mandiri, Kalimantan Tengah [The Volume Model of Tree Species Group in Peat Swamp Forest at Logging Concession Area of Tingang Karya Mandiri, Central Kalimantan]. Jurnal WASIAN, 7(1), 1-14.","title":"Model Volume Kelompok Jenis Pohon pada Hutan Rawa Gambut di IUPHHK PT. Tingang Karya Mandiri, Kalimantan Tengah","authors":["Qirom, M. A.","Akbar, A."],"year":2020,"venue":"Jurnal WASIAN","doi":"10.20886/jwas.v7i1.5538","url":"https://doi.org/10.20886/jwas.v7i1.5538","read_url":"https://pub.kehutanan.unismuh.ac.id/index.php/wasian/article/download/97/88","access":"open","checked_at":"2026-11-02","status":"current"},"name":"Peat swamp forest, all species, volume from D (model 3)","output":{"quantity":"stem_volume"},"expression":"0.00042 * D^2.2254","published":{"expression":"0.00042 * DBH^2.2254","units":{"DBH":"cm"},"variables":{"DBH":"D"},"output_unit":"m3"},"taxon":{"level":"mixed","name":"Mixed peat swamp forest species (6 species, Dipterocarpaceae and others)","group":"broadleaf"},"region":{"scope":"site","countries":["ID"],"place":"IUPHHK PT Tingang Karya Mandiri peat swamp forest, Central Kalimantan","biomes":["tropical"]},"stand":"natural","fit":{"n_trees":84,"dbh_min_cm":5.6,"dbh_max_cm":29.2,"h_min_m":6,"h_max_m":24,"r2":0.955,"method":"ordinary least squares, non-linear power form V = a0 D^a1"},"evidence":[{"field":"expression","quote":"V = 0.00042 D2.22540 dengan R2 95,5 %","locator":"Best model, all species, p. 10 (Tabel 3 model 3)"},{"field":"fit.n_trees","quote":"Keseluruhan jenis Diameter 13,4 5,6 29,2 5,3 84","locator":"Tabel 1, Penyusunan Model"}],"check":[{"inputs":{"D":8},"expected":0.042952,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":15},"expected":0.17399,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":25},"expected":0.54228,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Volume to a 5 cm top diameter by Smalian's formula on 2 m sections (stem volume, no branches). Diameter was taken at 1.3 m or 20 cm above ground (as printed: 'setinggi dada (1,3 m) atau 20 cm di atas permukaan tanah'); the paper does not say which trees used which. Natural-log form as printed, with no correction factor stated. Fit ranges are those of the model-development subset (70% of the trees, Table 1)."}