{"id":"qirom-2020-dipterocarpaceae-d2h","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, Dipterocarpaceae group, volume from D and H (model 7)","output":{"quantity":"stem_volume"},"expression":"0.000074 * (D^2 * H)^0.954143","published":{"expression":"0.000074 * (DBH^2 * H)^0.954143","units":{"DBH":"cm","H":"m"},"variables":{"DBH":"D","H":"H"},"output_unit":"m3"},"taxon":{"level":"family","name":"Dipterocarpaceae","family":"Dipterocarpaceae","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":42,"dbh_min_cm":6.3,"dbh_max_cm":29.2,"h_min_m":8.2,"h_max_m":20.2,"r2":0.989,"method":"ordinary least squares, non-linear power form V = a0 (D2H)^a1"},"evidence":[{"field":"expression","quote":"V = 0,000074(D2H)0,954143 R2 = 98,9 %","locator":"Best model, Dipterocarpaceae group, p. 10 (Tabel 3 model 7)"},{"field":"fit.n_trees","quote":"Kelompok dipterocarpaceae Diameter 13,0 6,3 29,2 4,5 42","locator":"Tabel 1, Penyusunan Model"}],"check":[{"inputs":{"D":10,"H":12},"expected":0.064152,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":20,"H":16},"expected":0.31686,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":28,"H":20},"expected":0.74506,"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)."}