{"id":"dong-2018-birch-ms3-stem","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":"White birch stem biomass from D and H (MS-3) (Table 6)","output":{"quantity":"stem_biomass"},"expression":"exp(-3.4046 + 2.0371 * ln(D) + 0.7708 * ln(H))","published":{"expression":"exp(-3.4046) * D^2.0371 * H^0.7708","units":{"D":"cm","H":"m"},"output_unit":"kg"},"taxon":{"level":"species","name":"Betula platyphylla","family":"Betulaceae","group":"broadleaf"},"region":{"scope":"regional","countries":["CN"],"place":"Eastern Daxing'an Mountains, Heilongjiang, northeast China","biomes":["boreal","montane"]},"stand":"natural","fit":{"n_trees":108,"dbh_min_cm":1.4,"dbh_max_cm":20.5,"h_min_m":3.1,"h_max_m":21,"method":"seemingly unrelated regression (SUR), additive system, W = exp(b0) D^b1 H^b2"},"evidence":[{"field":"expression","quote":"Ws = e^β20 · D^β21 · H^β22; White birch | Stem | -3.4046 | 2.0371 | 0.7708","locator":"Table 6 (MS-3), White birch, stem row; model form Eq. (14) structure"},{"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},"expected":1.9347,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":10,"H":11},"expected":22.9724,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":18,"H":17},"expected":106.4012,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"White birch, additive system MS-3 (Table 6); W = exp(b0) * D^b1 * H^b2 (Eqs. 17 form per Table caption). Ranges and n from Table 2. The b0 column is the exponent of e (W = e^b0 ...), as in Eq. (14). Stem includes bark. Root excludes fine roots <5 mm. No R2 recorded (adjusted R2 only)."}