{"id":"cienciala-2008-dead-branch-d","source":{"id":"cienciala-2008","citation":"Cienciala, E., Apltauer, J., Exnerová, Z., and Tatarinov, F. (2008). Biomass functions applicable to oak trees grown in Central-European forestry. Journal of Forest Science, 54(3), 109–120.","title":"Biomass functions applicable to oak trees grown in Central-European forestry","authors":["Cienciala, E.","Apltauer, J.","Exnerová, Z.","Tatarinov, F."],"year":2008,"type":"journal-article","venue":"Journal of Forest Science","doi":"10.17221/2906-jfs","url":"https://doi.org/10.17221/2906-jfs","read_url":"https://www.agriculturejournals.cz/publicFiles/01003.pdf","access":"open","license":"CC BY-NC 4.0","checked_at":"2026-11-05","status":"current"},"name":"Oak dead branch biomass, Eq. 1","output":{"quantity":"branch_biomass"},"expression":"0.4e-5 * D^3.932","published":{"expression":"0.4e-5 * D^3.932","units":{"D":"cm"},"output_unit":"kg"},"taxon":{"level":"genus","name":"Quercus (Q. robur and Q. petraea)","group":"broadleaf","members":["Quercus robur","Quercus petraea"],"members_complete":true},"region":{"scope":"national","countries":["CZ"],"place":"Six sites in the Czech Republic","biomes":["temperate"]},"fit":{"n_trees":51,"dbh_min_cm":6,"dbh_max_cm":59,"method":"Nonlinear regression"},"evidence":[{"field":"expression","quote":"Y = p₀ × D^{p₁}","locator":"Table 4, Eq. 1, p. 116 (rendered page)"},{"field":"expression","quote":"0.4E–5","locator":"Table 4, Eq. 1, p0, p. 116"},{"field":"expression","quote":"3.932","locator":"Table 4, Eq. 1, p1, p. 116"},{"field":"output","quote":"The component of dead branches","locator":"Table 4 caption, p. 116"},{"field":"published.units","quote":"D (cm)","locator":"Fig. 2, p. 111"},{"field":"published.units","quote":"BB (kg/tree)","locator":"Fig. 7, p. 118"},{"field":"taxon.members","quote":"Quercus robur; Quercus petraea","locator":"Keywords, p. 109"},{"field":"region","quote":"different regions of the Czech Republic","locator":"Abstract, p. 109"},{"field":"region","quote":"temperate region","locator":"Keywords, p. 109"},{"field":"fit.n_trees","quote":"51 grown trees sampled from 6 sites","locator":"Abstract, p. 109"},{"field":"fit.n_trees","quote":"The pooled dataset of all trees and their compo-","locator":"Methods, p. 111"},{"field":"fit.dbh_min_cm","quote":"breast height diameter (D) ranging from 6 to 59 cm","locator":"Abstract, p. 109"},{"field":"fit.dbh_max_cm","quote":"breast height diameter (D) ranging from 6 to 59 cm","locator":"Abstract, p. 109"},{"field":"fit.method","quote":"non-linear regression analysis applied to Eqs. (1) and (2)","locator":"Table 4 caption, p. 116"}],"check":[{"inputs":{"D":30},"expected":2.570992,"origin":"computed","note":"Computed from Table 4's printed coefficients."}],"verification":"original_read","doubt":"Table 4 prints the multiplicative coefficient as 0.4E−5, only one significant digit. Predictions from this printed coefficient can differ by more than a few percent from the unrounded fit; obtain more precise coefficients before relying on precise dead-branch estimates.","checked_at":"2026-11-05","notes":"This predicts dead branches only. The authors fitted this model by nonlinear regression, including zero observations; the log-model correction factor is not applied. Their mean prediction error excludes zero observations. Adjusted R² is not stored as unadjusted R²."}