{"id":"dong-2018-larch-ms4-root-dhcw","source":{"id":"dong-2018","citation":"Dong, L., Zhang, L., & Li, F. (2018). Additive Biomass Equations Based on Different Dendrometric Variables for Two Dominant Species (Larix gmelini Rupr. and Betula platyphylla Suk.) in Natural Forests in the Eastern Daxing'an Mountains, Northeast China. Forests, 9(5), 261.","title":"Additive Biomass Equations Based on Different Dendrometric Variables for Two Dominant Species (Larix gmelini Rupr. and Betula platyphylla Suk.) in Natural Forests in the Eastern Daxing'an Mountains, Northeast China","authors":["Dong, L.","Zhang, L.","Li, F."],"year":2018,"venue":"Forests","doi":"10.3390/f9050261","url":"https://doi.org/10.3390/f9050261","read_url":"https://www.mdpi.com/1999-4907/9/5/261/htm","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current"},"name":"Dahurian larch root biomass from D, H and crown width, system MS-4 (Table 7)","output":{"quantity":"bgb"},"expression":"exp(-3.3151 + 2.4283 * ln(D) - 0.0932 * ln(H) + 0.4675 * ln(CD))","published":{"expression":"exp(-3.3151) * D^2.4283 * H^(-0.0932) * CW^0.4675","units":{"D":"cm","H":"m","CW":"m"},"variables":{"CW":"CD"},"output_unit":"kg"},"taxon":{"level":"species","name":"Larix gmelinii","family":"Pinaceae","group":"conifer"},"region":{"scope":"regional","countries":["CN"],"place":"Eastern Daxing'an Mountains, Heilongjiang, northeast China","biomes":["boreal","montane"]},"stand":"natural","fit":{"n_trees":138,"dbh_min_cm":1.7,"dbh_max_cm":28.4,"h_min_m":2.4,"h_max_m":21.9,"method":"seemingly unrelated regression (SUR), additive system, W = exp(b0) D^b1 H^b2 CW^b3"},"evidence":[{"field":"expression","quote":"Wr = e^β10 · D^β11 · H^β12 · CW^β13; Dahurian larch | Root | -3.3151 | 2.4283 | -0.0932 | 0.4675","locator":"Table 7, Dahurian larch, root row; model form Eq. (18)"},{"field":"fit.n_trees","quote":"138 Dahurian larch trees and 108 white birch trees were destructively sampled","locator":"Section 2.2"}],"check":[{"inputs":{"D":4,"H":5,"CD":0.6},"expected":0.7135,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":10,"H":11,"CD":1.2},"expected":8.4826,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":20,"H":17,"CD":2.2},"expected":58.2058,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Dahurian larch, MS-4 (Table 7): W = exp(b0) * D^b1 * H^b2 * CW^b3 where CW is crown width (m), mapped to canonical CD. Crown width range 0.3-2.9 m (Table 2). Stem includes bark; roots exclude fine roots <5 mm. No R2 recorded (adjusted R2 only)."}