{"id":"gomez-2021-cei-group","source":{"id":"gomez-2021","citation":"Gómez, J.D., Etchevers, J.D., Campo, J., Monterroso, A.I., Paustian, K., Asensio, C. (2021). Allometric relationships to estimate aboveground biomass of species in a tropical dry forest of Central Mexico. Madera y Bosques, 27(4), e2742441.","title":"Allometric relationships to estimate aboveground biomass of species in a tropical dry forest of Central Mexico","authors":["Gómez, J.D.","Etchevers, J.D.","Campo, J."],"year":2021,"venue":"Madera y Bosques","doi":"10.21829/myb.2021.2742441","url":"https://doi.org/10.21829/myb.2021.2742441","read_url":"https://myb.ojs.inecol.mx/index.php/myb/article/download/2441/2274","access":"open","license":"CC BY-NC-SA 4.0","checked_at":"2026-11-02","status":"current","notes":"Only the dbh-only power models (Tables 3 and 4) are captured. The multiple regressions on basal area, wood density and height (Tables 5 and 6) are not added."},"name":"Lower wood density subgroup (CEI) AGB from dbh (Table 4)","output":{"quantity":"agb"},"expression":"exp(-3.515 + 2.652 * ln(D))","published":{"expression":"exp(-3.515 + 2.652 * ln(DBH))","units":{"DBH":"cm"},"variables":{"DBH":"D"},"output_unit":"kg"},"taxon":{"level":"mixed","name":"Conzattia multiflora, Euphorbia schlechtendalii and Ipomoea arborescens (CEI subgroup, lower wood density)","group":"broadleaf","members":["Conzattia multiflora","Euphorbia schlechtendalii","Ipomoea arborescens"],"members_complete":true},"region":{"scope":"site","countries":["MX"],"place":"Sierra de Huautla Biosphere Reserve (Ejido El Limón), Morelos","biomes":["tropical","dryland"]},"stand":"natural","fit":{"r2":0.908,"method":"Linear regression of ln(biomass) on ln(dbh)"},"evidence":[{"field":"expression","quote":"ln(Y) = ln(a) + b ln(X)","locator":"Eq. 2, p. 4"},{"field":"expression","quote":"CEI: n 26; β0 -3.515; β1 2.652; R2 0.908","locator":"Table 4, p. 9"},{"field":"fit.r2","quote":"R2 0.908","locator":"Table 4, p. 9"},{"field":"output","quote":"Y is aboveground biomass (kg), X is dbh (cm)","locator":"p. 4"}],"check":[{"inputs":{"D":10},"expected":13.3492,"origin":"computed","note":"computed from the printed coefficients"},{"inputs":{"D":20},"expected":83.9047,"origin":"computed","note":"computed from the printed coefficients"}],"rejected_by_source":{"quote":"Thus, it is only possible to use a single equation for the species of the first subgroup, but not for those of the second or all species together (Table 4).","locator":"Results, p. 8"},"verification":"original_read","checked_at":"2026-11-02","notes":"ln(Y) = b0 + b1 ln(DBH), natural log, no correction factor stated in the paper. Aboveground biomass includes foliage and small branches (trunk and crown sections were summed). The paper found the CEI parameters heterogeneous across species. n 26 counts branch units, so n_trees is left out."}