{"id":"paramonov-2022-stem","source":{"id":"paramonov-2022","citation":"Paramonov, A. A., Usoltsev, V. A., Tretyakov, S. V., et al. (2022). Willow tree biomass and its allometric models in the conditions of the Arkhangelsk region. Forests of Russia and economy in them, 4(83), 10–19.","title":"Willow tree biomass and its allometric models in the conditions of the Arkhangelsk region","authors":["Paramonov, A. A.","Usoltsev, V. A.","Tretyakov, S. V."],"year":2022,"venue":"Леса России и хозяйство в них (Forests of Russia and economy in them)","doi":"10.51318/fret.2022.27.41.002","url":"https://doi.org/10.51318/fret.2022.27.41.002","access":"open","checked_at":"2026-11-02","status":"current","notes":"Russian-language article with English abstract and translated table captions. Root model (ln Pr, n = 8) and the generalised European-Russia model (Eq. 4) rely on data from Smirnov (1971), not this study, so they are not added."},"name":"Willow (Salix spp.) stem biomass with bark, northern taiga, Arkhangelsk","output":{"quantity":"stem_biomass"},"expression":"exp(-2.3671 + 2.2861 * ln(D))","published":{"expression":"exp(-2.3671 + 2.2861 * ln(D))","units":{"D":"cm"},"output_unit":"kg"},"taxon":{"level":"genus","name":"Salix","family":"Salicaceae","group":"broadleaf"},"region":{"scope":"regional","countries":["RU"],"place":"Arkhangelsk region, northern taiga, Russia","biomes":["boreal"]},"stand":"natural","fit":{"n_trees":52,"rse":0.233,"method":"static allometry ln Pi = a0 + a1 ln D, regression fitted in Statgraphics-19"},"evidence":[{"field":"expression","quote":"ln Pi = a0 + a1ln D (1); ln Ps –2,3671 2,2861 0,891 0,233 (coefficients a0, a1, adjR2, SE)","locator":"Eq. 1 and Table 2"},{"field":"fit.n_trees","quote":"Характеристика модельных деревьев ивы, взятых на 52 пробных площадях Архангельской области","locator":"Table 1 caption"}],"check":[{"inputs":{"D":5},"expected":3.7145,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":8},"expected":10.8777,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":12},"expected":27.4851,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Model ln Pi = a0 + a1 ln D with natural log (stated as ln); biomass Pi in kg oven-dry, D at breast height in cm. The paper states no back-transformation correction factor, so none is applied. The SE printed in Table 2 is used as rse. The paper reports adjusted R2 only, so r2 is omitted. n = 52 sample trees taken from the 52 plots in Table 1. Stem biomass is stem with bark ('Ps')."}