{"id":"poudel-2016-df-agb","source":{"id":"poudel-2016","citation":"Poudel, K. P., & Temesgen, H. (2016). Methods for estimating aboveground biomass and its components for Douglas-fir and lodgepole pine trees. Canadian Journal of Forest Research, 46(1), 77-87.","title":"Methods for estimating aboveground biomass and its components for Douglas-fir and lodgepole pine trees","authors":["Poudel, K. P.","Temesgen, H."],"year":2016,"venue":"Canadian Journal of Forest Research","doi":"10.1139/cjfr-2015-0256","url":"https://doi.org/10.1139/cjfr-2015-0256","read_url":"https://utoronto.scholaris.ca/bitstreams/36d392bb-40cc-4598-b73c-6745768b0acf/download","access":"open","license":"Author accepted manuscript (open access copy read; license not stated)","checked_at":"2026-11-02","status":"current"},"name":"Douglas-fir total aboveground biomass, simple SUR (D only)","output":{"quantity":"agb"},"expression":"exp(-0.349 + 1.925 * ln(D)) + exp(-3.247 + 1.919 * ln(D)) + exp(-2.604 + 1.942 * ln(D)) + exp(-3.242 + 1.758 * ln(D))","published":{"expression":"exp(-0.349 + 1.925 * ln(D)) + exp(-3.247 + 1.919 * ln(D)) + exp(-2.604 + 1.942 * ln(D)) + exp(-3.242 + 1.758 * ln(D))","units":{"D":"cm"},"output_unit":"kg"},"taxon":{"level":"species","name":"Pseudotsuga menziesii","family":"Pinaceae","group":"conifer"},"region":{"scope":"regional","countries":["US"],"place":"Oregon, USA (several forests)","biomes":["temperate"]},"stand":"mixed","fit":{"n_trees":22,"dbh_min_cm":19.3,"dbh_max_cm":114,"method":"seemingly unrelated regression (simple SUR), component equations constrained to sum to total, fitted in original scale"},"evidence":[{"field":"expression","quote":"Total = Σ exp(aij + aij*X1 ...) over bole, bark, branch and foliage; simple SUR uses X1 = ln(DBH) only","locator":"Eq. 6 and Table 3, Simple SUR, Douglas-fir"},{"field":"fit.n_trees","quote":"22 Douglas-fir (Pseudotsuga menziesii (Mirbel) Franco) and 33 lodgepole pine (Pinus contorta) trees","locator":"Materials and Methods, Data and Study Area"}],"check":[{"inputs":{"D":20},"expected":270.0274,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":50},"expected":1571.2054,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":100},"expected":5956.2268,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Read from the author's accepted manuscript (draft, manuscript ID cjfr-2015-0256.R1), not the typeset article; values may differ from the final print. Total is the sum of the four component equations (bole, bark, branch, foliage) from the constrained SUR system, so it includes foliage and bark. Fitted in original scale, no correction factor. Extended SUR models (height, crown length) not included."}