{"id":"jung-2014-total","source":{"id":"jung-2014","citation":"Jung, S.C., Lumbres, R.I.C., Won, H.K., Seo, Y.O. (2014). Allometric equations, stem density and biomass expansion factors for Cryptomeria japonica in Mount Halla, Jeju Island, Korea. Journal of Ecology and Environment, 37(4), 177-184.","title":"Allometric equations, stem density and biomass expansion factors for Cryptomeria japonica in Mount Halla, Jeju Island, Korea","authors":["Jung, S.C.","Lumbres, R.I.C.","Won, H.K."],"year":2014,"venue":"Journal of Ecology and Environment","doi":"10.5141/ecoenv.2014.021","url":"https://doi.org/10.5141/ecoenv.2014.021","read_url":"https://koreascience.or.kr/article/JAKO201435648478256.pdf","access":"open","license":"CC BY-NC 3.0","checked_at":"2026-11-02","status":"current"},"name":"Cryptomeria japonica Total (above + below) from DBH (Table 3)","output":{"quantity":"total_biomass"},"expression":"1.0 * exp(-1.777 + 2.169 * ln(D))","published":{"expression":"1.0 * exp(-1.777 + 2.169 * ln(DBH))","units":{"DBH":"cm"},"variables":{"DBH":"D"},"output_unit":"kg"},"taxon":{"level":"species","name":"Cryptomeria japonica","family":"Cupressaceae","group":"conifer"},"region":{"scope":"site","countries":["KR"],"place":"Hannam experimental forest, Mount Halla, Jeju Island, South Korea","biomes":["temperate","subtropical"]},"stand":"plantation","fit":{"n_trees":18,"dbh_min_cm":13,"dbh_max_cm":28,"h_min_m":9,"h_max_m":14,"r2":0.953,"cf":1,"method":"log-log regression with Sprugel correction factor (SAS 9.1)"},"evidence":[{"field":"expression","quote":"Y = exp [a + b*ln(X)]","locator":"Materials and Methods, Data analysis"},{"field":"expression","quote":"Total -1.777 2.169 0.116 0.953 1.000","locator":"Table 3 (columns a, b, RMSE, R2, CF)"},{"field":"fit.n_trees","quote":"A total of 18 representative sample trees were selected based on their DBH class.","locator":"Data collection"},{"field":"fit.dbh_min_cm","quote":"DBH (cm) 20 (13-28)","locator":"Table 1"}],"check":[{"inputs":{"D":15},"expected":60.1452,"origin":"computed","note":"computed from the Table 3 coefficients and CF"},{"inputs":{"D":25},"expected":182.1338,"origin":"computed","note":"computed from the Table 3 coefficients and CF"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Y = CF * exp[a + b*ln(X)], Y in kg, X = DBH in cm; the Sprugel correction factor CF = exp(SEE^2/2) from Table 3 is applied (text: Sprugel correction factors were used to correct the bias). Includes root. Table 3 prints no n per equation; n = 18 harvested sample trees (roots of all 18 reported in Table 2). Single 40-year-old stand."}