{"id":"bartelink-1997-iii-leaves","source":{"id":"bartelink-1997","citation":"Bartelink, H. H. (1997). Allometric relationships for biomass and leaf area of beech (Fagus sylvatica L). Annales des Sciences Forestières, 54(1), 39–50.","title":"Allometric relationships for biomass and leaf area of beech (Fagus sylvatica L)","authors":["Bartelink, H. H."],"year":1997,"type":"journal-article","venue":"Annales des Sciences Forestières","doi":"10.1051/forest:19970104","url":"https://doi.org/10.1051/forest:19970104","read_url":"https://hal.science/hal-00883130/document","access":"open","checked_at":"2026-11-05","status":"current","notes":"The candidate identifies a publisher-hosted open URL, but the publisher returned HTTP 403 during this check. The publisher's access status and Crossref's type could not be independently confirmed."},"name":"Leaf biomass from diameter and height (Table III)","output":{"quantity":"foliage_biomass"},"expression":"0.0167 * D^2.951 * H^(-1.101)","published":{"expression":"0.0167 * dbh^2.951 * h^(-1.101)","units":{"dbh":"cm","h":"m"},"variables":{"dbh":"D","h":"H"},"output_unit":"kg"},"taxon":{"level":"species","name":"Fagus sylvatica","group":"broadleaf"},"region":{"scope":"site","countries":["NL"],"place":"Forest area in the centre of the Netherlands","biomes":[]},"fit":{"n_trees":38,"r2":0.923,"method":"nonlinear least squares"},"evidence":[{"field":"expression","quote":"Y = c₁*dbh^c₂*h^c₃; c₁ = 0.0167, c₂ = 2.951, c₃ = −1.101","locator":"Table III, model below table and Leaves row, p. 43 (rendered page-06)."},{"field":"expression","quote":"Leaves 0.0167 0.0097 2.951 0.283 −1.101 0.375 0.923","locator":"Table III, p. 43 (rendered page)"},{"field":"expression","quote":"The models are of the form Y = c₁*dbhᶜ²*hᶜ³.","locator":"Table III, p. 43 (rendered page)"},{"field":"output","quote":"leaf biomass","locator":"Results, p. 43"},{"field":"published.units","quote":"Nonlinear models between tree biomass amounts or leaf area (Y: in kg or m²) and dbh (in cm) and tree height (h: in m).","locator":"Table III, p. 43 (rendered page)"},{"field":"fit.n_trees","quote":"The number of observations is 38.","locator":"Table III, p. 43 (rendered page)"},{"field":"fit.r2","quote":"Leaves 0.0167 0.0097 2.951 0.283 −1.101 0.375 0.923","locator":"Table III, p. 43 (rendered page)"},{"field":"fit.method","quote":"In the case of nonlinear regression analysis the model was fitted directly by nonlinear least squares.","locator":"Data analysis, p. 42"},{"field":"taxon","quote":"beech (Fagus sylvatica L)","locator":"Title, p. 39"},{"field":"region","quote":"centre of the Netherlands.","locator":"Data collection, p. 40"}],"check":[{"inputs":{"D":15,"H":14},"expected":2.700690454,"origin":"computed","note":"Computed from Table III."}],"verification":"original_read","checked_at":"2026-11-05","notes":"DBH is measured at 1.30 m; h is measured tree height. The author reports that adding height increased R² and cautions against extrapolation, particularly for leaf and branch fits. R² is adjusted for degrees of freedom."}