{"id":"poudel-2019-tsuga-mertensiana","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":"Mountain hemlock total aboveground biomass from DBH (Table 4)","output":{"quantity":"agb"},"expression":"exp(-0.9861 + 2.0975 * ln(D))","published":{"expression":"exp(-0.9861 + 2.0975 * ln(DBH))","units":{"DBH":"cm"},"variables":{"DBH":"D"},"output_unit":"kg"},"taxon":{"level":"species","name":"Tsuga mertensiana","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":9,"dbh_min_cm":13.5,"dbh_max_cm":76.2,"h_min_m":6.1,"h_max_m":37.2,"method":"nonlinear regression, response not log-transformed (CF = 1.0000)"},"evidence":[{"field":"expression","quote":"Mountain hemlock  a, b, c, d, CF: −0.9861  2.0975  CF 1.0000; model form exp(a + bX1)","locator":"Table 4, species row and table note"},{"field":"fit.n_trees","quote":"Mountain hemlock ... n 9","locator":"Table 1"},{"field":"fit.dbh_min_cm","quote":"Mountain hemlock DBH min 13.5 max 76.2; HT min 6.1 max 37.2","locator":"Table 1"}],"check":[{"inputs":{"D":15},"expected":109.2933,"origin":"computed","note":"computed from the Table 4 coefficients"},{"inputs":{"D":35},"expected":646.2863,"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."}