{"id":"bartelink-1997-eq1a-height","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":"Tree height from diameter (Eq. 1a)","output":{"quantity":"height"},"expression":"exp(0.549 + 0.769 * ln(D))","published":{"expression":"exp(0.549 + 0.769 * ln(dbh))","units":{"dbh":"cm"},"variables":{"dbh":"D"},"output_unit":"m"},"taxon":{"level":"species","name":"Fagus sylvatica","group":"broadleaf"},"region":{"scope":"site","countries":["NL"],"place":"Forest area in the centre of the Netherlands","biomes":[]},"fit":{"r2":0.934,"method":"log-log linear regression"},"evidence":[{"field":"expression","quote":"ln(h) = 0.549 + 0.769*ln (dbh)","locator":"Equation [1a], p. 43 (rendered page-06)."},{"field":"expression","quote":"0.549 + 0.769*ln (dbh)","locator":"Eq. 1a, p. 43"},{"field":"expression","quote":"h = 1.732 * dbh⁰·⁷⁶⁹","locator":"Eq. 1b, p. 43 (rendered page)"},{"field":"output","quote":"tree height (m)","locator":"Below Eq. 1b, p. 43"},{"field":"published.units","quote":"dbh (in cm)","locator":"Table II, p. 43 (rendered page)"},{"field":"fit.r2","quote":"0.934 [1a]","locator":"Eq. 1a, p. 43"},{"field":"fit.method","quote":"tree height was best described after a log-log","locator":"Results, p. 43"},{"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},"expected":13.894465629,"origin":"computed","note":"Computed by exponentiating Eq. 1a; diameter is within the plotted sample."}],"verification":"original_read","checked_at":"2026-11-05","notes":"DBH is measured at 1.30 m. Eq. 1a is exponentiated using its printed coefficients. The paper gives no back-transformation correction and none is applied. Its Eq. 1b uses the rounded multiplier 1.732, producing a small rounding difference. R² is adjusted for degrees of freedom."}