{"id":"gomez-2021-a-cochliacantha","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":"Acacia cochliacantha AGB from dbh (Table 3)","output":{"quantity":"agb"},"expression":"exp(-1.291 + 2.178 * ln(D))","published":{"expression":"exp(-1.291 + 2.178 * ln(DBH))","units":{"DBH":"cm"},"variables":{"DBH":"D"},"output_unit":"kg"},"taxon":{"level":"species","name":"Acacia cochliacantha","family":"Fabaceae","group":"broadleaf"},"region":{"scope":"site","countries":["MX"],"place":"Sierra de Huautla Biosphere Reserve (Ejido El Limón), Morelos","biomes":["tropical","dryland"]},"stand":"natural","fit":{"r2":0.89,"method":"Linear regression of ln(biomass) on ln(dbh)"},"evidence":[{"field":"notes","quote":"Species branching out close to the trunk base (A. cochliacantha and E. schlechtendalii), were also cut at ground level, but the main branches (primary and secondary) were separated, and their diameter also measured at breast height. These branches have an architecture like the mother tree, therefore, they were considered as individual units","locator":"Generation of the allometric equations, p. 3"},{"field":"expression","quote":"ln(Y) = ln(a) + b ln(X)","locator":"Eq. 2, p. 4"},{"field":"expression","quote":"Acacia cochliacantha: n 8(26)*; β0 -1.291; β1 2.178; R2 0.89","locator":"Table 3, p. 7"},{"field":"fit.r2","quote":"R2 0.89","locator":"Table 3, p. 7"},{"field":"output","quote":"Y is aboveground biomass (kg), X is dbh (cm)","locator":"p. 4"}],"check":[{"inputs":{"D":10},"expected":41.431,"origin":"computed","note":"computed from the printed coefficients"},{"inputs":{"D":20},"expected":187.486,"origin":"computed","note":"computed from the printed coefficients"}],"verification":"original_read","checked_at":"2026-11-03","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 fitted this species per primary branch, not per tree: each primary branch is one unit, its D is the sum of the dbh of its secondary branches, and its biomass includes a share of the trunk base split by basal area. For a whole tree, predict each primary branch and add the predictions. The paper lists n as 8(26)* (8 trees, the starred figure counting branch units), so n_trees is left out; Table 1 gives the trees' dbh, not the units', so no range is stored."}