{"id":"kang-2016-total-quad-d","source":{"id":"kang-2016","citation":"Kang, M.S., Jang, K.S., Son, Y.M., et al. (2016). Allometric Equations and Biomass Expansion of Yellow Poplar (Liriodendron tulipifera) in Southern Korea. Journal of Korean Forest Society, 105(4), 463-471.","title":"Allometric Equations and Biomass Expansion of Yellow Poplar (Liriodendron tulipifera) in Southern Korea","authors":["Kang, M.S.","Jang, K.S.","Son, Y.M."],"year":2016,"venue":"Journal of Korean Forest Society","doi":"10.14578/jkfs.2016.105.4.463","url":"https://doi.org/10.14578/jkfs.2016.105.4.463","read_url":"http://e-journal.kfs21.or.kr/journal/view.asp?key=3493107","access":"open","license":"CC BY-NC 3.0","checked_at":"2026-11-02","status":"current"},"name":"Liriodendron tulipifera Total W = aD + bD^2 (Table 10)","output":{"quantity":"total_biomass"},"expression":"-8.758 * D + 0.795 * D^2","published":{"expression":"-8.758 * DBH + 0.795 * DBH^2","units":{"DBH":"cm"},"variables":{"DBH":"D"},"output_unit":"kg"},"taxon":{"level":"species","name":"Liriodendron tulipifera","family":"Magnoliaceae","group":"broadleaf"},"region":{"scope":"regional","countries":["KR"],"place":"Suwon (Gyeonggi), Jangseong and Gangjin (Jeollanam-do), South Korea","biomes":["temperate"]},"stand":"plantation","fit":{"r2":0.978,"method":"regression in SPSS 19.0"},"evidence":[{"field":"expression","quote":"Total -8.758 0.795 0.978","locator":"Table 10 (W=aD+bD^2)"}],"check":[{"inputs":{"D":15},"expected":47.505,"origin":"computed","note":"computed from the Table 10 coefficients"},{"inputs":{"D":30},"expected":452.76,"origin":"computed","note":"computed from the Table 10 coefficients"}],"verification":"original_read","checked_at":"2026-11-02","notes":"W = dry weight in kg (Table 7 in kg), D = DBH in cm. The paper prints no correction factor, so none is applied. Includes root. Predicts negative biomass below about 12 cm DBH (authors' remark), so the authors prefer the power form. Total biomass includes roots (available for 21 trees); n and ranges for this equation are not printed, so they are omitted."}