{"id":"kang-2016-stem-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 Stem W = aD + bD^2 (Table 10)","output":{"quantity":"stem_biomass"},"expression":"-3.058 * D + 0.423 * D^2","published":{"expression":"-3.058 * DBH + 0.423 * 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":{"n_trees":40,"dbh_min_cm":5.9,"dbh_max_cm":38.7,"r2":0.964,"method":"regression in SPSS 19.0"},"evidence":[{"field":"expression","quote":"Stem -3.058 0.423 0.964","locator":"Table 10 (W=aD+bD^2)"},{"field":"fit.n_trees","quote":"조사한 백합나무 표준목은 40본이나 뿌리까지 굴취한 것은 21본이다.","locator":"결과 및 고찰 1 (Results 1)"}],"check":[{"inputs":{"D":15},"expected":49.305,"origin":"computed","note":"computed from the Table 10 coefficients"},{"inputs":{"D":30},"expected":288.96,"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. Predicts negative biomass below about 12 cm DBH (authors' remark), so the authors prefer the power form. DBH 5.9-38.7 cm and height 6.6-26.6 m are the min and max of the per-site ranges in Table 6 (Suwon, Jangseong, Gangjin; ages 8-34 years)."}