{"id":"karaban-2023-bgb-d-agb","source":{"id":"karaban-2023","citation":"Karaban, A. A., Usoltsev, V. A., Tretyakov, S. V., Koptev, S. V., Paramonov, A. A., Tsvetkov, I. V., Davydov, A. V., & Tsepordey, I. S. (2023). Biomass of gray alder trees and its allometric models in the conditions of the Arkhangelsk region. Forests of Russia and economy in them, 2(85), 42–50.","title":"Biomass of gray alder trees and its allometric models in the conditions of the Arkhangelsk region","authors":["Karaban, A. A.","Usoltsev, V. A.","Tretyakov, S. V."],"year":2023,"venue":"Forests of Russia and economy in them (Леса России и хозяйство в них)","doi":"10.51318/fret.2023.36.20.005","url":"https://doi.org/10.51318/fret.2023.36.20.005","read_url":"https://usfeu.ru/media/filer_public/31/1c/311c8894-375c-49bb-9c23-860c9d9a5c51/5_karaban_usoltsev_dr_biomassa_derevev_olkhi.pdf","access":"open","checked_at":"2026-11-02","status":"current"},"name":"Gray alder, southern taiga and mixed-forest data (Kazimirov 1978, Miezīte 2011): root biomass from D and aboveground biomass (Table 2)","output":{"quantity":"bgb"},"expression":"exp(2.1294 + -3.5935 * ln(D) + 2.4672 * ln(AGB))","published":{"expression":"exp(2.1294 + -3.5935 * ln(D) + 2.4672 * ln(Pa))","units":{"D":"cm","Pa":"kg"},"variables":{"Pa":"AGB"},"output_unit":"kg"},"taxon":{"level":"species","name":"Alnus incana","family":"Betulaceae","group":"broadleaf"},"region":{"scope":"regional","countries":["RU","LV"],"place":"Southern taiga and coniferous-broadleaved subzones of European Russia and Latvia (root data of Kazimirov et al. 1978 and Miezīte et al. 2011), not the Arkhangelsk sample","biomes":["boreal","temperate"]},"stand":"mixed","fit":{"n_trees":17,"rse":0.265,"method":"OLS regression on natural logarithms; free term corrected for log transformation (Baskerville 1972)"},"evidence":[{"field":"expression","quote":"ln Pr (3) 2,1294 –3,5935 2,4672 – 0,945 0,265 17 (ln Pr = a0 + a1 ln D + a3 ln Pa)","locator":"Table 2, ln Pr row, eq. (3)"},{"field":"fit.n_trees","quote":"17 определений","locator":"Results, p. 46 (root data from Kazimirov et al. 1978 and Miezite et al. 2011, southern taiga and mixed forest subzones)"}],"check":[{"inputs":{"D":5,"AGB":5},"expected":1.3726,"origin":"computed","note":"computed from the published form (coefficients as printed; free term already includes the Baskerville log correction per the Table 2 note)"},{"inputs":{"D":10,"AGB":20},"expected":3.4769,"origin":"computed","note":"computed from the published form (coefficients as printed; free term already includes the Baskerville log correction per the Table 2 note)"},{"inputs":{"D":15,"AGB":45},"expected":5.9884,"origin":"computed","note":"computed from the published form (coefficients as printed; free term already includes the Baskerville log correction per the Table 2 note)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Root biomass was not measured by the authors: fitted on 17 observations for gray alder from the southern taiga and coniferous-broadleaved subzones (Kazimirov et al. 1978; Miezite et al. 2011), not on the Arkhangelsk trees. Inputs: D in cm and aboveground biomass Pa in kg (Pa = AGB). adjR2 = 0.945. Natural log as printed; Baskerville correction already in the free term."}