{"id":"tretyakov-2022-wood","source":{"id":"tretyakov-2022","citation":"Tretyakov, S., Koptev, S., Tsvetkov, I., et al. (2022). The equations of the relation of the weight of absolutely dry phytomass fractions of Alnus incana (L.) Moench trees with the taxation diameter in the taiga zone of the Arkhangelsk region. Forestry Engineering Journal (Lesotekhnicheskii zhurnal), 12(3), 62-78.","title":"The equations of the relation of the weight of absolutely dry phytomass fractions of Alnus incana (L.) Moench trees with the taxation diameter in the taiga zone of the Arkhangelsk region","authors":["Tretyakov, S.","Koptev, S.","Tsvetkov, I."],"year":2022,"venue":"Forestry Engineering Journal","doi":"10.34220/issn.2222-7962/2022.3/6","url":"https://doi.org/10.34220/issn.2222-7962/2022.3/6","read_url":"http://lestehjournal.ru/sites/default/files/journal_pdf/62-78_0.pdf","access":"open","checked_at":"2026-11-02","status":"current"},"name":"Grey alder trunk wood (bark excluded) dry mass from DBH (general equation)","output":{"quantity":"stem_biomass"},"expression":"0.0485 * D^2.5138","published":{"expression":"0.0485 * D^2.5138","units":{"D":"cm"},"output_unit":"kg"},"taxon":{"level":"species","name":"Alnus incana","family":"Betulaceae","group":"broadleaf"},"region":{"scope":"regional","countries":["RU"],"place":"Arkhangelsk forestry, North-taiga region, Arkhangelsk oblast","biomes":["boreal"]},"stand":"natural","fit":{"n_trees":21,"dbh_min_cm":4,"dbh_max_cm":17,"r2":0.9196,"method":"power regression on 21 model trees pooled over 4 stands"},"evidence":[{"field":"expression","quote":"M_wood a.d. = 0.0485 · D^2.5138, R² = 0.9196","locator":"Eq. 18, p. 68"},{"field":"fit.n_trees","quote":"A total of 21 model trees were studied","locator":"Abstract"},{"field":"fit.dbh","quote":"которые работают при таксационных диаметрах от 4 до 17 см","locator":"Results, p. 68"}],"check":[{"inputs":{"D":4},"expected":1.582,"origin":"published","note":"Table 5, p. 73"},{"inputs":{"D":10},"expected":15.832,"origin":"published","note":"Table 5, p. 73"},{"inputs":{"D":16},"expected":51.601,"origin":"published","note":"Table 5, p. 73"}],"verification":"original_read","checked_at":"2026-11-02","notes":"General equation fitted on all 21 model trees from four grey alder stands. D is trunk diameter at 1.3 m (cm); output is absolutely dry mass in kg. The last digit of the exponent is clipped in the printed Eq. 20 and 21 (2.3413 and 2.0522 read from the PDF); Table 5 values reproduce within 1% across D = 4 to 16 cm. Per-stand equations in Table 1 are not included. Trunk bark (Eq. 19: 0.0144*D^2.1832, R2 0.7892) has no separate output quantity and is not included. Wood fraction excludes bark."}