{"id":"dutca-2020-fir-rim4-dh","source":{"id":"dutca-2020","citation":"Dutcă, I., Zianis, D., Petrițan, I. C., Bragă, C. I., Ștefan, G., Yuste, J. C., & Petrițan, A. M. (2020). Allometric Biomass Models for European Beech and Silver Fir: Testing Approaches to Minimize the Demand for Site-Specific Biomass Observations. Forests, 11(11), 1136.","title":"Allometric Biomass Models for European Beech and Silver Fir: Testing Approaches to Minimize the Demand for Site-Specific Biomass Observations","authors":["Dutcă, I.","Zianis, D.","Petrițan, I. C."],"year":2020,"venue":"Forests","doi":"10.3390/f11111136","url":"https://doi.org/10.3390/f11111136","read_url":"https://bucks.repository.guildhe.ac.uk/id/eprint/18110/1/forests-11-01136.pdf","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current"},"name":"Silver fir AGB, RIM, Dataset #4, D and H","output":{"quantity":"agb"},"expression":"1.0121 * exp(-2.7987 + 1.8076 * ln(D) + 0.804 * ln(H))","published":{"expression":"1.0121 * exp(-2.7987 + 1.8076 * ln(D) + 0.804 * ln(H))","units":{"D":"cm","H":"m"},"output_unit":"kg"},"taxon":{"level":"species","name":"Abies alba","family":"Pinaceae","group":"conifer"},"region":{"scope":"site","countries":["RO"],"place":"Șinca virgin forest, Romania","biomes":["temperate","montane"]},"stand":"natural","fit":{"n_trees":109,"dbh_min_cm":5.1,"dbh_max_cm":64,"h_min_m":3.5,"h_max_m":28.9,"rse":0.1548,"cf":1.0121,"method":"random intercept mixed model on log-log data (generic plus site-specific trees); estimates for the Șinca site"},"evidence":[{"field":"expression","quote":"ln(D),ln(H): β0 = -2.7987, β1 = 1.8076, β2 = 0.804, RSE = 0.1548, CF = 1.0121","locator":"Table 5, silver fir, RIM, Dataset #4, ln(D),ln(H) (Equation 3; back-transformed as Equation 5)"},{"field":"fit.dbh_min_cm","quote":"D range (cm) 5.1–64.0","locator":"Table 4, Dataset #4, silver fir"},{"field":"fit.h_min_m","quote":"H range (m) 3.5–28.9","locator":"Table 4, Dataset #4, silver fir"},{"field":"fit.n_trees","quote":"151 (i.e., 144 + 7) / 109 (i.e., 102 + 7)","locator":"Table 4, sample size"}],"check":[{"inputs":{"D":20,"H":16},"expected":128.7116,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":50,"H":30},"expected":1117.9622,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Fit on Dataset #4 (generic + reduced site sample of 7 trees). Whole-tree dry AGB including foliage (stem and branches with leaves/needles weighed and dried). Equation form AGB = exp(β0)·D^β1·(H^β2)·CF with CF = exp(σ²/2) printed in Table 5 and applied here. D in cm, H in m, output kg (units not restated beside Table 5; stated in Table 1 for D, H, AGB). For RIM models the parameters printed are those retained for the Șinca site. Fit ranges are those of Dataset #4 (Table 4: generic trees plus the 7 smallest site trees)."}