{"id":"ruiz-peinado-2012-populus-euramericana-stem","source":{"id":"ruiz-peinado-2012","citation":"Ruiz-Peinado, R., Montero, G., & del Rio, M. (2012). Biomass models to estimate carbon stocks for hardwood tree species. Forest Systems, 21(1), 42-52.","title":"Biomass models to estimate carbon stocks for hardwood tree species","authors":["Ruiz-Peinado, R.","Montero, G.","del Rio, M."],"year":2012,"venue":"Forest Systems","doi":"10.5424/fs/2112211-02193","url":"https://doi.org/10.5424/fs/2112211-02193","read_url":"https://fs.revistas.csic.es/index.php/fs/article/download/2193/1635","access":"open","checked_at":"2026-11-02","status":"current"},"name":"Populus x euramericana stem with bark biomass (Table 2)","output":{"quantity":"stem_biomass"},"expression":"0.0130 * D^2 * H","published":{"expression":"0.0130 * d^2 * h","units":{"d":"cm","h":"m"},"variables":{"d":"D","h":"H"},"output_unit":"kg"},"taxon":{"level":"species","name":"Populus x euramericana","family":"Salicaceae","group":"broadleaf"},"region":{"scope":"national","countries":["ES"],"place":"Spain (sample zones per species, Figure 1)","biomes":["temperate"]},"stand":"mixed","fit":{"n_trees":32,"dbh_min_cm":11.4,"dbh_max_cm":50.7,"h_min_m":9.6,"h_max_m":31.1,"method":"seemingly unrelated regression with weighting"},"evidence":[{"field":"expression","quote":"Ws = 0.0130 · d² · h","locator":"Table 2, Populus x euramericana, Stem row"},{"field":"fit.n_trees","quote":"Populus x euramericana ... 32","locator":"Table 1, Populus x euramericana row, aboveground biomass n column"},{"field":"fit.dbh_min_cm","quote":"Populus x euramericana 11.4 50.7","locator":"Table 1, diameter min/max (all sample trees of the species)"}],"check":[{"inputs":{"D":20,"H":10},"expected":52,"origin":"computed","note":"computed from the Table 2 coefficients"},{"inputs":{"D":35,"H":15},"expected":238.875,"origin":"computed","note":"computed from the Table 2 coefficients"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Stem with bark (commercial volume, up to a top diameter of 7 cm); fitted jointly with the branch equations by SUR to keep components additive. Stand type is not stated per species in the paper. Branch equations for this species are not added."}