{"id":"shen-2025-branch-d","source":{"id":"shen-2025","citation":"Shen, H., You, H., Yu, X., Zhang, T., Zhao, Y., & Liu, X. (2025). Biomass Allocation and Allometric Equations in an Age Sequence of Chinese Pine (Pinus tabuliformis) Plantations. Forests, 16(12), 1760.","title":"Biomass Allocation and Allometric Equations in an Age Sequence of Chinese Pine (Pinus tabuliformis) Plantations","authors":["Shen, H.","You, H.","Yu, X."],"year":2025,"venue":"Forests","doi":"10.3390/f16121760","url":"https://doi.org/10.3390/f16121760","read_url":"https://www.mdpi.com/1999-4907/16/12/1760/pdf?version=1763741259","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current"},"name":"Chinese pine branch biomass from DBH (age-sequence plantations)","output":{"quantity":"branch_biomass"},"expression":"0.0583 * D^2.0492","published":{"expression":"0.0583 * D^2.0492","units":{"D":"cm"},"output_unit":"kg"},"taxon":{"level":"species","name":"Pinus tabuliformis","family":"Pinaceae","group":"conifer"},"region":{"scope":"site","countries":["CN"],"place":"Lahailing forestry station, Chengde, northern Hebei Province","biomes":["temperate"]},"stand":"plantation","fit":{"n_trees":60,"r2":0.931,"method":"non-linear least squares"},"evidence":[{"field":"expression","quote":"M = aD^b","locator":"Section 2.3, Eq. 1"},{"field":"expression","quote":"Branch (1) 0.0583 2.0492 0.931 287 <0.001","locator":"Table 3"},{"field":"fit.r2","quote":"Branch (1) 0.0583 2.0492 0.931 287 <0.001","locator":"Table 3"},{"field":"fit.n_trees","quote":"In total, 60 sample trees were selected for the destructive measurement.","locator":"Section 2.2"}],"check":[{"inputs":{"D":10},"expected":6.5293,"origin":"computed","note":"hand-computed from the published form"},{"inputs":{"D":25},"expected":42.69,"origin":"computed","note":"hand-computed from the published form"}],"verification":"original_read","checked_at":"2026-11-02","notes":"M = aD^b. Power model M = aD^b (or a(D²H)^b) fitted by non-linear least squares (no log back-transform). Sample trees were 60 destructively harvested trees from stands aged 8, 18, 32 and 46 years; the paper does not give the DBH or height range of the sample trees (Table 1 gives stand means only), so none is given. Roots are coarse roots (>5 mm), so the root and total-tree equations leave out fine roots. The third form in Table 3, M = aD^b A^c, needs stand age (not a canonical variable) and is not added."}