{"id":"ter-mikaelian-2001-unmanaged","source":{"id":"ter-mikaelian-2001","citation":"Ter-Mikaelian, M., & Lautenschlager, R. A. (2001). Predictive equations for leaf area and biomass for sugar bushes in eastern Ontario. The Forestry Chronicle, 77(4), 643-649.","title":"Predictive equations for leaf area and biomass for sugar bushes in eastern Ontario","authors":["Ter-Mikaelian, M.","Lautenschlager, R. A."],"year":2001,"venue":"The Forestry Chronicle","doi":"10.5558/tfc77643-4","url":"https://doi.org/10.5558/tfc77643-4","read_url":"https://pubs.cif-ifc.org/doi/pdf/10.5558/tfc77643-4","access":"open","checked_at":"2026-11-02","status":"current"},"name":"Sugar maple leaf biomass from DBH, unmanaged stand","output":{"quantity":"foliage_biomass"},"expression":"0.00157 * D^2.447","published":{"expression":"0.00157 * DBH^2.447","units":{"DBH":"cm"},"variables":{"DBH":"D"},"output_unit":"kg"},"taxon":{"level":"species","name":"Acer saccharum","family":"Sapindaceae","group":"broadleaf"},"region":{"scope":"site","countries":["CA"],"place":"unmanaged stand north of Madoc, eastern Ontario","biomes":["temperate"]},"stand":"natural","fit":{"n_trees":12,"dbh_min_cm":21.3,"dbh_max_cm":58.5,"h_min_m":18,"h_max_m":27.4,"r2":0.923,"method":"log-linear regression, back-transformed by adding half the squared SEE to the intercept (Baskerville 1972)"},"evidence":[{"field":"expression","quote":"ln(LT) = -6.487 + 2.447*ln(DBH)","locator":"Fig. 2 caption (log form)"},{"field":"expression","quote":"LT = 0.00157*DBH^2.447","locator":"Table 3, back-transformed equation, DBH only (text layer of the PDF is garbled; coefficients cross-checked against the Fig. 2 caption)"},{"field":"fit.n_trees","quote":"Twelve trees were sampled from an unmanaged stand north of Madoc and 10 from a managed stand near Newburg","locator":"Data sampling"}],"check":[{"inputs":{"D":25},"expected":4.1367,"origin":"computed","note":"hand-computed from the published form"},{"inputs":{"D":40},"expected":13.0659,"origin":"computed","note":"hand-computed from the published form"},{"inputs":{"D":60},"expected":35.24,"origin":"computed","note":"hand-computed from the published form"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Output is total leaf biomass only (oven-dried leaves, kg), not petioles or seeds. Table 3 coefficients are the back-transformed form with the bias correction already in the intercept. Hosts: sugar bushes slightly ice-damaged (<5%) in 2000. The 'managed' stand is a sap-production sugar bush, set as natural stand type (not planted); the paper does not give stand origin. R2 is the log-scale value printed in Table 3 and the Fig. 2 caption."}