{"id":"chalupova-2026-agb-exp","source":{"id":"chalupova-2026","citation":"Chalupová, K., Šrámek, M., Kostka, M., Neubauer, Š., Patočka, Z., & Ehrenbergerová, L. (2026). Allometric models to estimate aboveground biomass of Pinus tecunumanii shade trees growing in agroforestry coffee systems. Agroforestry Systems, 100(8), 276.","title":"Allometric models to estimate aboveground biomass of Pinus tecunumanii shade trees growing in agroforestry coffee systems","authors":["Chalupová, K.","Šrámek, M.","Kostka, M."],"year":2026,"venue":"Agroforestry Systems","doi":"10.1007/s10457-026-01648-8","url":"https://doi.org/10.1007/s10457-026-01648-8","read_url":"https://link.springer.com/article/10.1007/s10457-026-01648-8","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current"},"name":"Total aboveground biomass, Pinus tecunumanii shade trees, exponential DBH+H","output":{"quantity":"agb"},"expression":"41.459422 * exp(0.059304 * D + 0.024294 * H)","published":{"expression":"41.459422 * exp(0.059304 * DBH + 0.024294 * H)","units":{"DBH":"cm","H":"m"},"variables":{"DBH":"D"},"output_unit":"kg"},"taxon":{"level":"species","name":"Pinus tecunumanii","family":"Pinaceae","group":"conifer"},"region":{"scope":"site","countries":["PE"],"place":"San Alberto coffee plantation, Oxapampa, Pasco (1,900 m a.s.l.)","biomes":["tropical","montane"]},"stand":"agroforestry","fit":{"n_trees":22,"dbh_min_cm":9.9,"dbh_max_cm":43.8,"h_min_m":6.3,"h_max_m":38,"method":"non-linear least squares"},"evidence":[{"field":"expression","quote":"B = a·exp(b·DBH + c·H); a, b, c = 41.459422, 0.059304, 0.024294","locator":"Table 1 (form) and Table 4 (parameters)"},{"field":"fit.n_trees","quote":"A total of 22 shade trees were sampled, with diameters at breast height (DBH) ranging from 9.9 to 43.8 cm and total heights (H) from 6.3 to 38 m.","locator":"Abstract"}],"check":[{"inputs":{"D":15,"H":12},"expected":135.0714,"origin":"computed","note":"hand-computed from the published form"},{"inputs":{"D":30,"H":20},"expected":399.3009,"origin":"computed","note":"hand-computed from the published form"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Parameters read from the HTML table pages (Table 4 gives the three parameters of each total model run together in one cell; split at six decimals, which reproduces a sensible biomass). Fitted by NLS directly on biomass, so no back-transform correction. B is dry biomass (kg). The paper reports pseudo-R2 and RMSE per model; not copied as r2. Models valid only within the calibration ranges. Table 4 pseudo-R2 0.76, RMSE 135.1 kg for the power-law; 0.75 and 137.2 kg for the exponential."}