{"id":"djomo-2010-pan-d-d2h-rho","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":"Pan moist tropical AGB from DBH, height and wood density (Table 4, model 5)","output":{"quantity":"agb"},"expression":"exp(-2.4733 + 0.2893 * ln(D)^2 - 0.0372 * ln(D)^3 + 0.7415 * ln(D^2 * H) + 0.2843 * ln(rho))","published":{"expression":"exp(-2.4733 + 0.2893 * ln(D)^2 - 0.0372 * ln(D)^3 + 0.7415 * ln(D^2 * H) + 0.2843 * ln(WD))","units":{"D":"cm","H":"m","WD":"g/cm3"},"variables":{"WD":"rho"},"output_unit":"kg"},"taxon":{"level":"mixed","name":"Mixed species, pan moist tropical forests (Campo-Ma'an plus data from Asia and South America)","group":"broadleaf"},"region":{"scope":"pantropical","countries":[],"place":"Moist tropical forests; Campo-Ma'an Cameroon, Brazil (Pará, Central Amazon), Indonesia","biomes":["tropical"]},"stand":"natural","fit":{"n_trees":274,"dbh_min_cm":1,"dbh_max_cm":138,"r2":0.9717,"rse":0.437,"method":"log-log regression"},"evidence":[{"field":"expression","quote":"ln(M) = −2.4733 + 0.2893(ln D)2 − 0.0372(ln D)3 + 0.7415 ln(D2 H) + 0.2843 ln(ρ)","locator":"Section 3.2, model 14 / Table 4, model 5"},{"field":"fit.n_trees","quote":"N 274, RSE 0.437, Adj. R2 0.9717, D range 1–138","locator":"Table 4, model 5"}],"check":[{"inputs":{"D":30,"H":25,"rho":0.64},"expected":823.53,"origin":"computed","note":"hand-computed from the published form"}],"verification":"original_read","checked_at":"2026-11-01","notes":"Best pan moist tropical equation in the paper. Table 4 gives the ln(ρ) coefficient in the footnote (0.2843). 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. Equation chosen from the paper's recommended set (7 of its equations captured)."}