{"id":"bocko-2023-m4-height","source":{"id":"bocko-2023","citation":"Bocko, Y.E., Panzou, G.J.L., Dargie, G.C., Mampouya, Y.E.W., Mbemba, M., Loumeto, J.J., Lewis, S.L. (2023). Allometric equation for Raphia laurentii De Wild, the commonest palm in the central Congo peatlands. PLoS ONE, 18(4), e0273591.","title":"Allometric equation for Raphia laurentii De Wild, the commonest palm in the central Congo peatlands","authors":["Bocko, Y.E.","Panzou, G.J.L.","Dargie, G.C."],"year":2023,"venue":"PLoS ONE","doi":"10.1371/journal.pone.0273591","url":"https://doi.org/10.1371/journal.pone.0273591","read_url":"https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0273591&type=printable","access":"open","license":"CC BY 4.0 (Creative Commons Attribution License)","checked_at":"2026-11-02","status":"current","notes":"Read the full open PDF. Four of the 22 models in Table 2 are captured: the single-predictor models on stem base diameter (m2, m13) and total palm height (m4, m15), the only ones using canonical variables. The paper's best models use the sum of petiole diameters (SDp, m1, m7, m11, m12, m18) and tissue density, which are not canonical variables and are not captured. Destructive sampling of 90 palms."},"name":"Raphia laurentii AGB from total palm height (m4, all sizes)","output":{"quantity":"agb"},"expression":"1.13 * exp(-5.262 + 3.404 * ln(H))","published":{"expression":"1.13 * exp(-5.262 + 3.404 * ln(H))","units":{"H":"m"},"output_unit":"kg"},"taxon":{"level":"species","name":"Raphia laurentii","group":"palm"},"region":{"scope":"site","countries":["CG"],"place":"Peat swamp forest near Bolembe, Likouala Department, Republic of the Congo","biomes":["tropical"]},"stand":"natural","fit":{"n_trees":90,"h_min_m":5.13,"h_max_m":21.2,"cf":1.13,"method":"ln-ln linear regression times correction factor CF = exp(RSE²/2)"},"evidence":[{"field":"expression","quote":"m4 ln(AGB) = a + b × ln(H) -5.262 3.404 0.82 0.50 136.13 38.51 -5.55 1.13","locator":"Table 2, m4 row (AGB in kg dry mass); CF defined in Methods, p. 5"},{"field":"notes","quote":"The aboveground biomass estimated from each logarithmic linear model was multiplied by the following correction factor","locator":"Development of allometric equations, p. 5"},{"field":"fit.n_trees","quote":"Table 2 range (n): 2–15 cm (90)","locator":"Table 2, mean petiole diameter range (n) column"},{"field":"fit.h_min_m","quote":"Total palm height (H; m) 13.30±3.88 5.13–21.20","locator":"Table 1 (all 90 palms)"}],"check":[{"inputs":{"H":8},"expected":6.9493,"origin":"computed","note":"computed from the published form (coefficients and CF as printed)"},{"inputs":{"H":13},"expected":36.281,"origin":"computed","note":"computed from the published form (coefficients and CF as printed)"},{"inputs":{"H":18},"expected":109.84,"origin":"computed","note":"computed from the published form (coefficients and CF as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Whole-palm aboveground dry biomass (stem, sheaths, petioles, rachis and leaflets, so foliage is included). Total height is base of the stem to the highest point of the fronds. Fitted on 90 palms of mean petiole diameter 2–15 cm. CF is the printed correction factor (rounded to 2 decimals) and is applied in the expression. Single-predictor model: the paper's better models use the sum of petiole diameters (not a canonical variable; not captured), so this is a fallback for when only diameter or height is measured. R² adj printed: 0.82; RSE 0.50 (Table 2)."}