{"id":"tungalag-2020-branch-d","source":{"id":"tungalag-2020","citation":"Tungalag, M., Altanzagas, B., Gerelbaatar, S., & Dorjsuren, Ch. (2020). Tree-level above-ground biomass equations for Pinus sylvestris L. in Mongolia. Mongolian Journal of Biological Sciences, 18(1), 13-21.","title":"Tree-Level Above-Ground Biomass Equations for Pinus sylvestris L. in Mongolia","authors":["Tungalag, M.","Altanzagas, B.","Gerelbaatar, S."],"year":2020,"venue":"Mongolian Journal of Biological Sciences","doi":"10.22353/mjbs.2020.18.02","url":"https://doi.org/10.22353/mjbs.2020.18.02","read_url":"https://www.biotaxa.org/mjbs/article/download/59351/59360 (Wayback Machine copy)","access":"open","license":"CC BY-NC-ND (per OpenAlex)","checked_at":"2026-11-02","status":"current"},"name":"Scots pine branch biomass, ln-ln OLS (D only)","output":{"quantity":"branch_biomass"},"expression":"1.181 * exp(-5.918 + 2.882 * ln(D))","published":{"expression":"1.181 * exp(-5.918 + 2.882 * ln(D))","units":{"D":"cm"},"output_unit":"kg"},"taxon":{"level":"species","name":"Pinus sylvestris","family":"Pinaceae","group":"conifer"},"region":{"scope":"regional","countries":["MN"],"place":"Northeastern Khangai and western Khentii forest regions, northern Mongolia","biomes":["boreal","montane"]},"stand":"natural","fit":{"n_trees":35,"dbh_min_cm":4.7,"dbh_max_cm":55,"h_min_m":4.6,"h_max_m":23,"cf":1.181,"method":"ordinary least squares on ln-transformed data (type N), with correction factor CF = exp(RMSE²/2)"},"evidence":[{"field":"expression","quote":"lnŶ=lna+blnD; N: lna = -5.918, b = 2.882, CF = 1.181","locator":"Table 4, branch section, Eq. 4, type N, p. 17"},{"field":"fit.n_trees","quote":"A total of 35 sample trees were destructively sampled","locator":"Materials and Methods, Data collection, p. 14"}],"check":[{"inputs":{"D":10},"expected":2.4216,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":25},"expected":33.9593,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":45},"expected":184.7794,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Ordinary least squares (type N) rows of Table 4 with the printed CF applied; the weighted (type W) rows are not included because their printed RMSE/CF are on a weighted scale. The paper does not say whether the printed lna values for type N are rounded further. Table 4 decimal commas read as decimal points. The abstract names the D and H form (Eq. 6) as the best-fitting; the D-only form is also given. Total AGB = stem + branches + needles; the paper also describes a one-step proportional weighting for additivity, not applied here. Biomass in kg (Eq. 1 text)."}