{"id":"dong-2016-korean-pine-sys1-stem","source":{"id":"dong-2016","citation":"Dong, L., Zhang, L., & Li, F. (2016). Developing Two Additive Biomass Equations for Three Coniferous Plantation Species in Northeast China. Forests, 7(7), 136.","title":"Developing Two Additive Biomass Equations for Three Coniferous Plantation Species in Northeast China","authors":["Dong, L.","Zhang, L.","Li, F."],"year":2016,"venue":"Forests","doi":"10.3390/f7070136","url":"https://doi.org/10.3390/f7070136","read_url":"https://www.mdpi.com/1999-4907/7/7/136/htm","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current"},"name":"Korean pine stem biomass from D only (System 1, Table 4)","output":{"quantity":"stem_biomass"},"expression":"exp(-2.4644 + 2.2884 * ln(D))","published":{"expression":"exp(-2.4644 + 2.2884 * ln(D))","units":{"D":"cm"},"output_unit":"kg"},"taxon":{"level":"species","name":"Pinus koraiensis","family":"Pinaceae","group":"conifer"},"region":{"scope":"regional","countries":["CN"],"place":"Pure plantations, northeast China","biomes":["temperate"]},"stand":"plantation","fit":{"n_trees":114,"dbh_min_cm":5.4,"dbh_max_cm":33.4,"h_min_m":5.4,"h_max_m":16.2,"method":"seemingly unrelated regression (SUR) on log-transformed additive system, ln W = a + b ln D"},"evidence":[{"field":"expression","quote":"lnWs = a* + b* × lnD; Table 4, Korean pine, System 1 (D only): Stem | -2.4644 | 2.2884","locator":"Eqs. (1) and Table 4"},{"field":"fit.n_trees","quote":"a total of 114 Korean pine trees, 90 larch trees, and 85 Mongolian pine trees were destructively sampled","locator":"Section 2.2"}],"check":[{"inputs":{"D":8.2},"expected":10.4929,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":16.6},"expected":52.7011,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":27.8},"expected":171.505,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Korean pine plantations, System 1 (D only) of Table 4: ln W = a* + b* ln D, natural logarithm, coefficients as printed (a*, b*, c*). No correction factor is stated in the paper, none applied. n and D/H ranges from Table 2 (sample statistics of the fitted trees). Stem includes bark; roots exclude fine roots <5 mm. No R2 recorded (adjusted R2 only)."}