{"id":"delcourt-2022-ustyansky-stem","source":{"id":"delcourt-2022","citation":"Delcourt, C. J. F., & Veraverbeke, S. (2022). Allometric equations and wood density parameters for estimating aboveground and woody debris biomass in Cajander larch (Larix cajanderi) forests of northeast Siberia. Biogeosciences, 19, 4499–4520.","title":"Allometric equations and wood density parameters for estimating aboveground and woody debris biomass in Cajander larch (Larix cajanderi) forests of northeast Siberia","authors":["Delcourt, C. J. F.","Veraverbeke, S."],"year":2022,"venue":"Biogeosciences","doi":"10.5194/bg-19-4499-2022","url":"https://doi.org/10.5194/bg-19-4499-2022","read_url":"https://bg.copernicus.org/articles/19/4499/2022/","access":"open","checked_at":"2026-11-02","status":"current"},"name":"Larix cajanderi, Ust-Yansky district, stem (wood plus bark) biomass from DBH (Table 5)","output":{"quantity":"stem_biomass"},"expression":"0.128 * D^2.227","published":{"expression":"0.128 * DBH^2.227","units":{"DBH":"cm"},"variables":{"DBH":"D"},"output_unit":"kg"},"taxon":{"level":"species","name":"Larix cajanderi","family":"Pinaceae","group":"conifer"},"region":{"scope":"site","countries":["RU"],"place":"Ust-Yansky district, Republic of Sakha, Russia (site-specific, Larix cajanderi stands)","biomes":["boreal"]},"stand":"natural","fit":{"n_trees":20,"dbh_min_cm":1.8,"dbh_max_cm":18.9,"method":"weighted nonlinear least squares power function, weights DBH^(-2c)"},"evidence":[{"field":"expression","quote":"Ust-Yansky district Stem 1.8–18.9 20 0.128 0.013 2.227 0.059 5.568; Y = a × DBH^b, Y in kg dry weight, DBH in cm","locator":"Table 5"},{"field":"fit.n_trees","quote":"20 trees, DBH range 1.8–18.9 cm","locator":"Table 5, Number of trees and DBH range columns"}],"check":[{"inputs":{"D":3},"expected":1.4783,"origin":"computed","note":"hand-computed from the published form"},{"inputs":{"D":8},"expected":13.134,"origin":"computed","note":"hand-computed from the published form"},{"inputs":{"D":15},"expected":53.256,"origin":"computed","note":"hand-computed from the published form"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Coefficients as printed in Table 5 (3 decimals); no log back-transform because fitted by weighted nonlinear regression. 'Stem' is the stem row (the table also lists stem wood and stem bark separately; the contract has no output for those)."}