{"id":"bohm-2011-eq6","source":{"id":"bohm-2011","citation":"Böhm, Ch., Quinkenstein, A., & Freese, D. (2011). Yield prediction of young black locust (Robinia pseudoacacia L.) plantations for woody biomass production using allometric relations. Annals of Forest Research, 54(2), 215-227.","title":"Yield prediction of young black locust (Robinia pseudoacacia L.) plantations for woody biomass production using allometric relations","authors":["Böhm, Ch.","Quinkenstein, A.","Freese, D."],"year":2011,"venue":"Annals of Forest Research","doi":"10.15287/afr.2011.91","url":"https://doi.org/10.15287/afr.2011.91","read_url":"https://www.afrjournal.org/index.php/afr/article/download/91/137","access":"open","checked_at":"2026-11-02","status":"current"},"name":"Young black locust woody AGB from shoot basal diameter (Eq. 6)","output":{"quantity":"agb","excludes":["foliage"]},"expression":"exp(-3.7933 + 2.8407 * ln(DRC)) * 1.099","published":{"expression":"exp(-3.7933 + 2.8407 * ln(SBD)) * 1.099","units":{"SBD":"cm"},"variables":{"SBD":"DRC"},"output_unit":"kg"},"taxon":{"level":"species","name":"Robinia pseudoacacia","family":"Fabaceae","group":"broadleaf"},"region":{"scope":"site","countries":["DE"],"place":"Welzow-Sued post-mining area, Lower Lusatia, Brandenburg","biomes":["temperate"]},"stand":"plantation","fit":{"n_trees":1242,"r2":0.91,"rse":0.43,"cf":1.099,"method":"OLS regression of ln-transformed data, back-transformed with correction factor CF"},"evidence":[{"field":"expression","quote":"ln(M [kg]) = - 3.7933 + 2.8407 . ln(SBD [cm])","locator":"Table 2, equation 6"},{"field":"fit.cf","quote":"CF = 1.099","locator":"Table 2, equation 6"},{"field":"fit.n_trees","quote":"n = 1242","locator":"Table 2 caption"}],"check":[{"inputs":{"DRC":8},"expected":9.1,"origin":"published","note":"Table 3, SBD column, eq. 6 (rounded to 0.1 kg in the paper)"},{"inputs":{"DRC":9},"expected":12.7,"origin":"published","note":"Table 3, SBD column, eq. 6 (rounded to 0.1 kg in the paper)"},{"inputs":{"DRC":10},"expected":17.2,"origin":"published","note":"Table 3, SBD column, eq. 6 (rounded to 0.1 kg in the paper)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Output is total aboveground woody dry biomass of a single tree (kg); the trees were cut about 10 cm above the soil, so the lowest 10 cm of stem is not in the biomass. Foliage listed as excluded because the paper models woody biomass only. SBD (shoot basal diameter, measured with a caliper about 10 cm above the soil) is mapped to canonical DRC. Natural log, as printed in Table 2; M = CF * exp(ln(M)) per Eq. 3. Trees from 2, 3, 4 and 14 year old short-rotation plantations. The paper states 1243 trees in the text and n = 1242 in the Table 2 caption; the table value is used. The paper gives no diameter or height range for the fit, so none is set."}