{"id":"meng-2021-root-d","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 root biomass from D (Table 3)","output":{"quantity":"bgb"},"expression":"0.086 * D^2.072","published":{"expression":"0.086 * D^2.072","units":{"D":"cm"},"output_unit":"kg"},"taxon":{"level":"genus","name":"Quercus (Q. mongolica and Q. wutaishanica)","family":"Fagaceae","group":"broadleaf","members":["Quercus mongolica","Quercus wutaishanica"],"members_complete":true},"region":{"scope":"regional","countries":["CN"],"place":"Daxing'anling, Xiaoxing'anling and Changbai mountains, NE China","biomes":["temperate","boreal","montane"]},"stand":"natural","fit":{"n_trees":53,"dbh_min_cm":1.5,"dbh_max_cm":32.8,"method":"weighted nonlinear regression (root equations fitted separately)"},"evidence":[{"field":"expression","quote":"Root D 0.086*** 2.072***","locator":"Table 3, Root, predictor D (selected: \"The equation with D as the only predictor was therefore most suitable for root biomass\")"},{"field":"fit.n_trees","quote":"53 trees with a D spanning 1.5-32.8 cm were selected for root biomass collection","locator":"Section 2.2"}],"check":[{"inputs":{"D":5},"expected":2.4142,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":15},"expected":23.5158,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":30},"expected":98.8766,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Root coefficients as listed in Table 3 for model W = b0*D^b1 (Table 3 coefficients; Table 3 caption: regression coefficients with weighting function). Root biomass is root plus stump dry biomass (Section 2.2). 53 excavated trees."}