{"id":"goodman-2013-palm-family-d","source":{"id":"goodman-2013","citation":"Goodman, R. C., Phillips, O. L., del Castillo Torres, D., Freitas, L., Cortese, S. T., Monteagudo, A., & Baker, T. R. (2013). Amazon palm biomass and allometry. Forest Ecology and Management, 310, 994–1004.","title":"Amazon palm biomass and allometry","authors":["Goodman, R. C.","Phillips, O. L.","del Castillo Torres, D."],"year":2013,"venue":"Forest Ecology and Management","doi":"10.1016/j.foreco.2013.09.045","url":"https://doi.org/10.1016/j.foreco.2013.09.045","read_url":"http://eprints.whiterose.ac.uk/77906/7/Amazon%20Palm%20Biomass_Goodman_with_coversheet.pdf","access":"paywalled","checked_at":"2026-11-01","status":"current"},"name":"Amazon arborescent palms, family-level AGB from diameter only","output":{"quantity":"agb"},"expression":"1.1887 * exp(-3.3488 + 2.7483 * ln(D))","published":{"expression":"1.1887 * exp(-3.3488 + 2.7483 * ln(D))","units":{"D":"cm"},"output_unit":"kg"},"taxon":{"level":"family","name":"Arecaceae","family":"Arecaceae","group":"palm"},"region":{"scope":"regional","countries":["PE"],"place":"Western Amazonia: Madre de Dios (terra firme) and Loreto (wetland), Peru","biomes":["tropical"]},"stand":"natural","fit":{"n_trees":97,"dbh_min_cm":6,"dbh_max_cm":40,"r2":0.802,"rse":0.588,"cf":1.1887,"method":"OLS on ln(AGB) vs ln(D), 9 species pooled; Baskerville correction exp(RSE²/2)"},"evidence":[{"field":"expression","quote":"Family-level ln(AGB) ln(D) -3.3488 2.7483 0.802 97 0.588","locator":"Table 3 (y, x1, a, b, R2, n, RSE)"},{"field":"fit.dbh_min_cm","quote":"the family-level models without a height term are only valid for individuals with Hstem > 3 m and 6 ≤ D < 40 cm","locator":"Table 3 caption"},{"field":"fit.cf","quote":"A correction factor, exp(RSE2/2), was applied to biomass estimates from logarithmically transformed models (Baskerville, 1972).","locator":"Section 2.4, lines 220–221 (author post-print)"}],"check":[{"inputs":{"D":20},"expected":157.1548,"origin":"computed","note":"computed from the Table 3 coefficients times exp(RSE²/2)"}],"verification":"original_read","checked_at":"2026-11-01","notes":"D measured at 1.3 m or above the highest stilt root. The correction factor exp(0.588²/2) is multiplied in, as the authors direct; Table 3 prints the log-scale coefficients without it. The authors recommend height-based species models (Hstem) where possible; D-only palm models are weak because many palms stop thickening."}