{"id":"flade-2020-trees-d30-nls","source":{"id":"flade-2020","citation":"Flade, L., Hopkinson, C., & Chasmer, L. (2020). Allometric Equations for Shrub and Short-Stature Tree Aboveground Biomass within Boreal Ecosystems of Northwestern Canada. Forests, 11(11), 1207.","title":"Allometric Equations for Shrub and Short-Stature Tree Aboveground Biomass within Boreal Ecosystems of Northwestern Canada","authors":["Flade, L.","Hopkinson, C.","Chasmer, L."],"year":2020,"venue":"Forests","doi":"10.3390/f11111207","url":"https://doi.org/10.3390/f11111207","read_url":"https://www.mdpi.com/1999-4907/11/11/1207/htm","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current"},"name":"Short-stature boreal trees (<=4.5 m), AGB from stem diameter at 0.3 m (NLS)","output":{"quantity":"agb"},"expression":"59.072 * D30^2.479 / 1000","published":{"expression":"59.072 * D30^2.479","units":{"D30":"cm"},"output_unit":"g"},"taxon":{"level":"mixed","name":"Multispecies short-stature trees (Betula papyrifera, Picea spp., Populus balsamifera, Populus tremuloides)","group":"mixed","members":["Betula papyrifera","Populus balsamifera","Populus tremuloides"],"members_complete":false},"region":{"scope":"regional","countries":["CA"],"place":"Fort Liard area, Taiga Plains, Northwest Territories","biomes":["boreal"]},"stand":"natural","fit":{"h_max_m":4.5,"r2":0.988,"method":"nonlinear least squares power function, y = beta * x^alpha (unweighted)"},"evidence":[{"field":"expression","quote":"Multispecies trees, Diameter at 0.3 m: NLS β 59.072, NLS α 2.479; y = β x^α","locator":"Table 5 and Eq. 7"},{"field":"fit.r2","quote":"NLS, Diameter at 0.3 m, R2 0.988","locator":"Table 4"},{"field":"fit.h_max_m","quote":"Live trees were chosen from the understory and open areas across different height ranges determined in intervals of 0.5 m up to ≤4.5 m","locator":"Section 2.3"}],"check":[{"inputs":{"D30":2},"expected":0.3293,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D30":5},"expected":3.1925,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D30":10},"expected":17.7985,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Total aboveground dry biomass (stem, branches, leaves) in grams; canonical form divides by 1000 for kg. Stem diameter measured 0.3 m along the stem from the ground. Paper gives the NLS and LLRC forms; the LLRC correction factor (epsilon = e^(MSE/2)) value is in Supplementary Table S4, which was not read, so LLRC is not added. n_trees omitted: text says 106 trees, Table 1 says 105 tree samples. Shrub volume/basal-diameter models and the cross-sectional-area models, the stem-length model and species-specific models not added (no canonical variable, or coefficients only in the supplement)."}