{"id":"meng-2021-branch-dcw","source":{"id":"meng-2021","citation":"Meng, S., Yang, F., Hu, S., et al. (2021). Generic Additive Allometric Models and Biomass Allocation for Two Natural Oak Species in Northeastern China. Forests, 12(6), 715.","title":"Generic Additive Allometric Models and Biomass Allocation for Two Natural Oak Species in Northeastern China","authors":["Meng, S.","Yang, F.","Hu, S."],"year":2021,"venue":"Forests","doi":"10.3390/f12060715","url":"https://doi.org/10.3390/f12060715","read_url":"https://www.mdpi.com/1999-4907/12/6/715/htm","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current"},"name":"Oak branch biomass from D and crown width, additive system 2 (Table 4)","output":{"quantity":"branch_biomass"},"expression":"0.017 * D^2.156 * CD^0.870","published":{"expression":"0.017 * D^2.156 * CW^0.870","units":{"D":"cm","CW":"m"},"variables":{"CW":"CD"},"output_unit":"kg"},"taxon":{"level":"genus","name":"Quercus (Q. mongolica and Q. wutaishanica)","family":"Fagaceae","group":"broadleaf"},"region":{"scope":"regional","countries":["CN"],"place":"Daxing'anling, Xiaoxing'anling and Changbai mountains, NE China","biomes":["temperate","boreal","montane"]},"stand":"natural","fit":{"n_trees":159,"dbh_min_cm":1.5,"dbh_max_cm":33,"h_min_m":1.4,"h_max_m":20.5,"method":"weighted nonlinear seemingly unrelated regression (NSUR), additive system"},"evidence":[{"field":"expression","quote":"Branch Wbr = 0.017D2.156CW0.870","locator":"Table 4, System 2"},{"field":"fit.n_trees","quote":"A total of 159 sample trees","locator":"Abstract"}],"check":[{"inputs":{"D":5,"CD":1.5},"expected":0.7774,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":15,"CD":3.5},"expected":17.3556,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":28,"CD":6},"expected":106.5401,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Fitted on 120 Mongolian oak and 39 Liaodong oak trees (Table 1; D 1.5-33.0 cm). Exponents are printed flattened in the HTML text; read as D^exponent. No R2 recorded (adjusted R2 only). CW is crown width (twice the mean crown radius); mapped to canonical CD (crown diameter). Crown width range 0.45-9.70 m (Table 1)."}