{"id":"altanzagas-2022-vol-gmelinii-d2h-n","source":{"id":"altanzagas-2022","citation":"Altanzagas, B., Altansukh, B., Ariunbaatar, T., & Dorjsuren, C. (2022). Allometric equations for the above-ground biomass of Gmelin larch (Larix gmelinii Rupr.), Chekanovsky larch (Larix czekanowskii Szaf) in the Ereen Forest-Vegetation Province of Mongolia. Mongolian Journal of Botany, 4(30), 115-131.","title":"Allometric equations for the above-ground biomass of Gmelin larch (Larix gmelinii Rupr.), Chekanovsky larch (Larix czekanowskii Szaf) in the Ereen Forest-Vegetation Province of Mongolia","authors":["Altanzagas, B.","Altansukh, B.","Ariunbaatar, T."],"year":2022,"venue":"Mongolian Journal of Botany","doi":"10.5564/mjb.v4i30.2588","url":"https://doi.org/10.5564/mjb.v4i30.2588","read_url":"https://www.mongoliajol.info/index.php/MJB/article/download/2588/2814","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current"},"name":"Gmelin larch stem volume from D²H, unweighted (Table 2, selected)","output":{"quantity":"stem_volume"},"expression":"1.031 * exp(-7.829 + 0.748 * ln(D^2 * H))","published":{"expression":"1.031 * exp(-7.829 + 0.748 * ln(D^2 * H))","units":{"D":"cm","H":"m"},"output_unit":"m3"},"taxon":{"level":"species","name":"Larix gmelinii","family":"Pinaceae","group":"conifer"},"region":{"scope":"site","countries":["MN"],"place":"Khaichiin Am, Eree Nuruu (Ereen mountains), Bayan-Uul sum, Dornod aimag, Mongolia","biomes":["boreal","montane"]},"stand":"natural","fit":{"n_trees":15,"dbh_min_cm":8.7,"dbh_max_cm":42.6,"h_min_m":8.2,"h_max_m":23.3,"cf":1.031,"method":"log-log regression, unweighted"},"evidence":[{"field":"expression","quote":"N lnŶ = lna + b × ln(D² × H)  -7.829  0.748  CF 1.031","locator":"Хүснэгт 2 (Table 2), Larix gmelinii, p. 122"},{"field":"fit.cf","quote":"ŷ = exp(lnŷ)CF; CF=exp(S²/2)","locator":"Eqs. 7-8, Methods p. 119"},{"field":"fit.n_trees","quote":"Гмелиний шинэсэн ойгоос авсан 15 шинэс модны ... диаметр 21.6 (8.7-42.6) см, өндөр 13.5 (8.2-23.3) м","locator":"Results p. 120"}],"check":[{"inputs":{"D":20,"H":13},"expected":0.247,"origin":"computed","note":"computed from the Table 2 coefficients and the printed back-transform y = exp(lny) x CF (eq. 8)"},{"inputs":{"D":35,"H":19},"expected":0.7579,"origin":"computed","note":"computed from the Table 2 coefficients and the printed back-transform y = exp(lny) x CF (eq. 8)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Paper is in Mongolian; table values quoted as printed. Unweighted (N) regression row; the printed CF is applied as exp(lnŷ) x CF per eq. 8. Adjusted R² and RMSE are in the table but are not stored (adjusted R², and RMSE on the log or weighted scale). Stem volume (m3) from Smalian sections. Natural log assumed from the paper's ln notation."}