{"id":"vargas-larreta-2017-a-bicolor-agb","source":{"id":"vargas-larreta-2017","citation":"Vargas-Larreta, B., López-Sánchez, C.A., Corral-Rivas, J.J., et al. (2017). Allometric Equations for Estimating Biomass and Carbon Stocks in the Temperate Forests of North-Western Mexico. Forests, 8(8), 269.","title":"Allometric Equations for Estimating Biomass and Carbon Stocks in the Temperate Forests of North-Western Mexico","authors":["Vargas-Larreta, B.","López-Sánchez, C.A.","Corral-Rivas, J.J."],"year":2017,"venue":"Forests","doi":"10.3390/f8080269","url":"https://doi.org/10.3390/f8080269","read_url":"https://www.mdpi.com/1999-4907/8/8/269","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current","notes":"Stem wood and stem bark component equations are not added (no matching output quantity: stem wood excludes bark). Total AGB is the printed sum of the four component equations."},"name":"Arbutus bicolor total aboveground biomass","output":{"quantity":"agb"},"expression":"(0.06438 * D^1.66448 * H^0.86489) + (0.00328 * D^1.51833 * H^0.95083) + (0.02125 * D^1.81216 * H^0.8198) + (0.00698 * D^1.50325 * H^0.84794)","published":{"expression":"(0.06438 * d^1.66448 * h^0.86489) + (0.00328 * d^1.51833 * h^0.95083) + (0.02125 * d^1.81216 * h^0.8198) + (0.00698 * d^1.50325 * h^0.84794)","units":{"d":"cm","h":"m"},"variables":{"d":"D","h":"H"},"output_unit":"kg"},"taxon":{"level":"species","name":"Arbutus bicolor","family":"Ericaceae","group":"broadleaf"},"region":{"scope":"regional","countries":["MX"],"place":"Durango, Sierra Madre Occidental","biomes":["temperate","montane"]},"stand":"natural","fit":{"n_trees":49,"dbh_min_cm":7.9,"dbh_max_cm":44.8,"r2":0.95,"method":"Power-law component equations fitted simultaneously by generalized method of moments (additive system)"},"evidence":[{"field":"expression","quote":"Wt = ΣWi","locator":"Table 2, p. 12"},{"field":"expression","quote":"0.06438d1.66448h0.86489","locator":"Table 2, p. 12"},{"field":"expression","quote":"0.00328d1.51833h0.95083","locator":"Table 2, p. 12"},{"field":"expression","quote":"0.02125d1.81216h0.8198","locator":"Table 2, p. 12"},{"field":"expression","quote":"0.00698d1.50325h0.84794","locator":"Table 2, p. 12"},{"field":"output","quote":"Wt is the total tree AGB (i.e., the sum of all the tree biomass components)","locator":"Section 2.3.1"},{"field":"fit.r2","quote":"R2 0.95 (cross-validation)","locator":"Table 2, p. 12"},{"field":"fit.n_trees","quote":"(49)","locator":"Table 1"}],"check":[{"inputs":{"D":20,"H":12},"expected":126.455,"origin":"computed","note":"computed from the Table 2 equations (sum of the four components)"},{"inputs":{"D":35,"H":18},"expected":462.415,"origin":"computed","note":"computed from the Table 2 equations (sum of the four components)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Equation as printed in the Table 2 system for this taxon; d is DBH in cm, h total height in m, output in kg dry mass. R² is the 10-fold cross-validation value. Total AGB is printed as Wt = sum of the four components (stem wood, stem bark, branches, foliage); the expression is that sum of the four printed equations. Table 1 prints a maximum height of 2.5 m against a mean of 8.9 m for this species, which is inconsistent, so the height range is left out."}