{"id":"cienciala-2008-stem-over-bark-l2","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 stem biomass over bark, Level 2","output":{"quantity":"stem_biomass"},"expression":"0.999 * exp(-3.731 + 1.933 * ln(D) + 1.036 * ln(H))","published":{"expression":"0.999 * exp(-3.731 + 1.933 * ln(D) + 1.036 * ln(H))","units":{"D":"cm","H":"m"},"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,"h_min_m":6,"h_max_m":32,"cf":0.999,"method":"Linearized regression"},"evidence":[{"field":"expression","quote":"Biomass component = λ × exp(p₀ + p₁ × lnD + p₂ × lnH); p₀ = −3.731, p₁ = 1.933, p₂ = 1.036, λ = 0.999","locator":"Table 3, model below table and Stem biomass over bark, Level 2 row, p. 115"},{"field":"expression","quote":"–3.731      1.933       1.036","locator":"Table 3, stem biomass over bark, Level 2, p. 115"},{"field":"expression","quote":"Biomass component = λ × exp(p0 + p1 × lnD","locator":"Table 3 formula, p. 115"},{"field":"expression","quote":"correction factor (λ)","locator":"Table 3 caption, p. 115"},{"field":"output","quote":"Stem biomass over bark","locator":"Table 3, p. 115"},{"field":"published.units","quote":"D (cm)","locator":"Fig. 2, p. 111"},{"field":"published.units","quote":"Tree height (m)","locator":"Fig. 2, p. 111"},{"field":"published.units","quote":"AB (kg/tree)","locator":"Fig. 4, p. 114"},{"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.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.h_min_m","quote":"tree height (H) from 6 to 32 m","locator":"Abstract, p. 109"},{"field":"fit.h_max_m","quote":"tree height (H) from 6 to 32 m","locator":"Abstract, p. 109"},{"field":"fit.cf","quote":"0.998      0.063       0.999        5.3","locator":"Table 3, stem biomass over bark, Level 2, p. 115"},{"field":"fit.method","quote":"linearized model (Eq. 3)","locator":"Methods, p. 112"},{"field":"published.output_unit","quote":"conventional density of 580 kg/m³ for stem wood and 300 kg/m³ for bark, respectively","locator":"Methods, p. 111"}],"check":[{"inputs":{"D":30,"H":20},"expected":382.256815,"origin":"computed","note":"Computed from the printed coefficients and correction factor."}],"verification":"original_read","doubt":"The stored height range follows the abstract's 6–32 m, but Table 1 reports conflicting site height ranges. Fig. 2 supports taller trees than Table 1 lists for Lanžhot. Confirm the fitted height limits before treating them as firm applicability bounds.","checked_at":"2026-11-05","notes":"Stem biomass includes bark. The printed correction factor multiplies the back-transformed prediction. Stem wood and bark biomass were estimated using conventional densities. Adjusted R² is not stored as unadjusted R²."}