{"id":"karaban-2023-agb-d-pooled","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, European Russia pooled: aboveground biomass from D (Eq. 5)","output":{"quantity":"agb"},"expression":"exp(-2.5395 + 2.4527 * ln(D))","published":{"expression":"exp(-2.5395 + 2.4527 * ln(D))","units":{"D":"cm"},"output_unit":"kg"},"taxon":{"level":"species","name":"Alnus incana","family":"Betulaceae","group":"broadleaf"},"region":{"scope":"regional","countries":["RU"],"place":"European Russia: northern taiga (Arkhangelsk) plus southern taiga and coniferous-broadleaved subzones","biomes":["boreal","temperate"]},"stand":"mixed","fit":{"rse":0.26,"method":"OLS regression on natural logarithms of the pooled northern and southern data"},"evidence":[{"field":"expression","quote":"ln Pa = –2,5395 + 2,4527 ln D; adjR2 = 0,939, SE = 0,26.","locator":"Eq. (5), p. 46"}],"check":[{"inputs":{"D":5},"expected":4.0876,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":10},"expected":22.3774,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":15},"expected":60.4934,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Generalised model recommended by the authors for aboveground biomass of gray alder in European Russia, combining the new northern taiga data with southern data (Smirnov 1971; Kazimirov et al. 1978; Miezite et al. 2011). Sample size and DBH range of the pooled set are not printed. Natural log; no separate correction factor stated. Reports adjusted R2 = 0.939."}