{"id":"djomo-2010-campo-d","source":{"id":"djomo-2010","citation":"Djomo, A.N., Ibrahima, A., Saborowski, J., Gravenhorst, G. (2010). Allometric equations for biomass estimations in Cameroon and pan moist tropical equations including biomass data from Africa. Forest Ecology and Management, 260(10), 1873–1885.","title":"Allometric equations for biomass estimations in Cameroon and pan moist tropical equations including biomass data from Africa","authors":["Djomo, A.N.","Ibrahima, A.","Saborowski, J."],"year":2010,"venue":"Forest Ecology and Management","doi":"10.1016/j.foreco.2010.08.034","url":"https://doi.org/10.1016/j.foreco.2010.08.034","read_url":"https://uni-goettingen.de/de/document/download/4df40c701547ab5773871feade802dc2.pdf/Djomo_et_al_(2010)_FORECOLMANAG_allometric_equations.pdf","access":"paywalled","checked_at":"2026-11-01","status":"current","notes":"Read from the authors' institutional PDF copy (Georg-August-Universität Göttingen). Seven of the paper's equations are captured: four Campo-Ma'an site equations (Table 3) and three pan moist tropical equations (Table 4). Leaf and branch equations (Table 3), the Table 3/4 variants not listed, and the height-diameter models (Table 6) are not captured."},"name":"Campo-Ma'an AGB from DBH (Table 3, model 2)","output":{"quantity":"agb"},"expression":"exp(-2.1079 + 2.3278 * ln(D))","published":{"expression":"exp(-2.1079 + 2.3278 * ln(D))","units":{"D":"cm"},"output_unit":"kg"},"taxon":{"level":"mixed","name":"Mixed species, Campo-Ma'an lowland moist forest","group":"broadleaf"},"region":{"scope":"site","countries":["CM"],"place":"Campo-Ma'an, southern Cameroon","biomes":["tropical"]},"stand":"natural","fit":{"n_trees":71,"dbh_min_cm":1,"dbh_max_cm":79,"r2":0.9562,"rse":0.33,"method":"log-log regression"},"evidence":[{"field":"expression","quote":"2. ln(M) = a + b ln(D)   a = −2.1079  b = 2.3278","locator":"Table 3, Total biomass, model 2"},{"field":"fit.n_trees","quote":"N 71, RSE 0.330, Adj. R2 0.9562, D (cm) 1–79","locator":"Table 3, model 2"}],"check":[{"inputs":{"D":30},"expected":333.42,"origin":"computed","note":"hand-computed from the published form"},{"inputs":{"D":10},"expected":25.84,"origin":"computed","note":"hand-computed from the published form"}],"verification":"original_read","checked_at":"2026-11-01","notes":"Mixed-species site equation from 71 felled trees; the authors state that model 2 and model 1 are good predictors with DBH only. Coefficients are used as printed; the paper does not state that the log-scale back-transformation correction factor is included, so none is applied. Reported R² is the adjusted R². Table 3 fit on 71 trees (7 of its equations captured). The Discussion (p. 1880) refits on 91 trees and recommends slightly different coefficients, printed without n, RSE or R²; this file keeps the Table 3 fit. The paper notes only three of the 71 trees were above 10 cm."}