{"id":"poudel-2019-tsuga-heterophylla","source":{"id":"poudel-2019","citation":"Poudel, K. P., Temesgen, H., Radtke, P. J., & Gray, A. N. (2019). Estimating individual-tree aboveground biomass of tree species in the western U.S.A. Canadian Journal of Forest Research, 49(6), 701-714.","title":"Estimating individual-tree aboveground biomass of tree species in the western U.S.A.","authors":["Poudel, K. P.","Temesgen, H.","Radtke, P. J."],"year":2019,"venue":"Canadian Journal of Forest Research","doi":"10.1139/cjfr-2018-0361","url":"https://doi.org/10.1139/cjfr-2018-0361","read_url":"https://vtechworks.lib.vt.edu/bitstreams/13666b54-8fb3-444c-8f8f-f54bc602a4b9/download","access":"open","checked_at":"2026-11-02","status":"current"},"name":"Western hemlock total aboveground biomass from DBH and height (Table 4)","output":{"quantity":"agb"},"expression":"1.0209 * exp(-2.7552 + 1.8521 * ln(D) + 0.7642 * ln(H))","published":{"expression":"1.0209 * exp(-2.7552 + 1.8521 * ln(DBH) + 0.7642 * ln(HT))","units":{"DBH":"cm","HT":"m"},"variables":{"DBH":"D","HT":"H"},"output_unit":"kg"},"taxon":{"level":"species","name":"Tsuga heterophylla","family":"Pinaceae","group":"conifer"},"region":{"scope":"regional","countries":["US"],"place":"Western U.S.A., legacy destructive-sampling biomass collection (Radtke et al. 2015)","biomes":["temperate"]},"stand":"mixed","fit":{"n_trees":115,"dbh_min_cm":3.1,"dbh_max_cm":77.8,"h_min_m":3.5,"h_max_m":53,"cf":1.0209,"method":"regression on ln(AGB) with Baskerville log-bias correction factor"},"evidence":[{"field":"expression","quote":"Western hemlock  a, b, c, d, CF: −2.7552  1.8521  0.7642  CF 1.0209; model form exp(a + bX1 + cX2)","locator":"Table 4, species row and table note"},{"field":"fit.n_trees","quote":"Western hemlock ... n 115","locator":"Table 1"},{"field":"fit.dbh_min_cm","quote":"Western hemlock DBH min 3.1 max 77.8; HT min 3.5 max 53.0","locator":"Table 1"}],"check":[{"inputs":{"D":20,"H":15},"expected":132.0753,"origin":"computed","note":"computed from the Table 4 coefficients"},{"inputs":{"D":40,"H":25},"expected":704.5245,"origin":"computed","note":"computed from the Table 4 coefficients"}],"verification":"original_read","checked_at":"2026-11-02","notes":"AGB is total aboveground live-tree biomass (stem, bark, branches, foliage). X1 = ln(DBH), X2 = ln(HT), DBH in cm and HT in m. Species identified from the common name in Table 4 (scientific name added from the standard species symbol). Stand type is not stated. Observed ranges in Table 1 cover all trees of the species used."}