{"id":"kartashova-2026-sambucus-pag-d0","source":{"id":"kartashova-2026","citation":"Kartashova, N.P., Sheshnitsan, S.S., Tsaregorodtsev, A.V. (2026). Allometric models of biomass of understory trees and shrubs in pine stands of Voronezh Oblast. Forestry Engineering Journal (Lesotekhnicheskii zhurnal), 16(3), 6–19.","title":"Allometric models of biomass of understory trees and shrubs in pine stands of Voronezh Oblast (Аллометрические модели фитомассы деревьев и кустарников подлеска в сосновых насаждениях Воронежской области)","authors":["Kartashova, N.P.","Sheshnitsan, S.S.","Tsaregorodtsev, A.V."],"year":2026,"venue":"Lesotekhnicheskii zhurnal","doi":"10.34220/issn.2222-7962/2026.3/1","url":"https://doi.org/10.34220/issn.2222-7962/2026.3/1","read_url":"http://lestehjournal.ru/sites/default/files/journal_pdf/1._6-19_ltzh_2026_tom_16_no_3_63.pdf","access":"open","checked_at":"2026-11-01","status":"current"},"name":"Sambucus racemosa, aboveground dry mass vs base diameter (Model 1)","output":{"quantity":"agb"},"expression":"1.62 * exp(-2.559 + 4.186 * ln(DRC))","published":{"expression":"1.62 * exp(-2.559 + 4.186 * ln(D0))","units":{"D0":"cm"},"variables":{"D0":"DRC"},"output_unit":"kg"},"taxon":{"level":"species","name":"Sambucus racemosa","family":"Sambucaceae","group":"shrub"},"region":{"scope":"site","countries":["RU"],"place":"Prigorodnoye Forestry, Levoberezhnoe District Forestry, Voronezh Oblast (pine stands, forest-steppe)","biomes":["temperate"]},"stand":"natural","fit":{"n_trees":7,"r2":0.903,"cf":1.62,"method":"log-log regression (OLS on natural logs), Baskerville correction factor"},"evidence":[{"field":"expression","quote":"lnPag = a0 + a1lnD0; Sambucus racemosa: a0 = -2,559, a1 = 4,186, BaskCF = 1,62","locator":"Eq. (1)/(2) and Table 2 (p. 10-11)"},{"field":"fit.n_trees","quote":"Sambucus racemosa n = 7","locator":"Table 1, p. 9"}],"check":[{"inputs":{"DRC":0.5},"expected":0.00688722,"origin":"computed","note":"hand-computed from the published form (Table 2 coefficients, Baskerville factor BaskCF applied)"},{"inputs":{"DRC":1},"expected":0.125359,"origin":"computed","note":"hand-computed from the published form (Table 2 coefficients, Baskerville factor BaskCF applied)"},{"inputs":{"DRC":1.5},"expected":0.684342,"origin":"computed","note":"hand-computed from the published form (Table 2 coefficients, Baskerville factor BaskCF applied)"}],"verification":"original_read","checked_at":"2026-11-01","notes":"Understory plant (small tree/shrub) under Scots pine. Output in kg: the text states kg for P; Table 1 headings say g, but the kg reading matches the ranges in Table 1 (e.g. Sambucus Pag max 943 g = 0.943 kg). Predictor is base diameter D0 (root collar), mapped to canonical DRC. n=7 (<10): authors treat as preliminary. Best-supported species in the paper (Q2CV 0.53-0.86)."}