{"id":"dong-2016-mongolian-pine-sys2-agb","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":"Mongolian pine (Pinus sylvestris var. mongolica) aboveground biomass from D and H (sum of components, System 2)","output":{"quantity":"agb"},"expression":"exp(-3.7044 + 1.9074 * ln(D) + 0.9412 * ln(H)) + exp(-4.9247 + 2.8783 * ln(D) - 0.3612 * ln(H)) + exp(-3.9908 + 2.5358 * ln(D) - 0.5262 * ln(H))","published":{"expression":"exp(-3.7044 + 1.9074 * ln(D) + 0.9412 * ln(H)) + exp(-4.9247 + 2.8783 * ln(D) - 0.3612 * ln(H)) + exp(-3.9908 + 2.5358 * ln(D) - 0.5262 * ln(H))","units":{"D":"cm","H":"m"},"output_unit":"kg"},"taxon":{"level":"species","name":"Pinus sylvestris var. mongolica","family":"Pinaceae","group":"conifer"},"region":{"scope":"regional","countries":["CN"],"place":"Pure plantations, northeast China","biomes":["temperate"]},"stand":"plantation","fit":{"n_trees":85,"dbh_min_cm":6,"dbh_max_cm":38.7,"h_min_m":3.5,"h_max_m":22.3,"method":"seemingly unrelated regression (SUR) on log-transformed additive system, ln W = a + b ln D + c ln H"},"evidence":[{"field":"expression","quote":"lnWa = ln(Ws + Wb + Wf) + εa; lnWt = ln(Wr + Ws + Wb + Wf) + εt","locator":"Eq. (2), additivity constraints"},{"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":9.3,"H":7.3},"expected":15.2751,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":19.1,"H":12.9},"expected":98.4112,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":32.2,"H":18.5},"expected":370.3021,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Mongolian pine (Pinus sylvestris var. mongolica) plantations, System 2 (D and H) of Table 4: ln W = a* + b* ln D + c* ln H, 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). The paper defines this total as the exact sum of its component equations (additivity constraint); the expression is that sum with the Table 4 component coefficients, not a separately printed coefficient set."}