{"id":"kang-2016-agb-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 Above ground W = aD + bD^2 (Table 10)","output":{"quantity":"agb"},"expression":"-3.49 * D + 0.486 * D^2","published":{"expression":"-3.49 * DBH + 0.486 * 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":0.957,"method":"regression in SPSS 19.0"},"evidence":[{"field":"expression","quote":"Above ground -3.490 0.486 0.957","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":57,"origin":"computed","note":"computed from the Table 10 coefficients"},{"inputs":{"D":30},"expected":332.7,"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. Above ground = stem + branch + foliage (Table 7). 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)."}