{"id":"cienciala-2008-agb-l3","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 aboveground biomass without foliage or dead branches, Level 3","output":{"quantity":"agb","excludes":["foliage"]},"expression":"0.994 * exp(-2.944 + 1.935 * ln(D) + 0.738 * ln(H) + 0.193 * ln(CD))","published":{"expression":"0.994 * exp(-2.944 + 1.935 * ln(D) + 0.738 * ln(H) + 0.193 * ln(CW))","units":{"D":"cm","H":"m","CW":"m"},"variables":{"CW":"CD"},"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":0.994,"method":"Stepwise linearized regression"},"evidence":[{"field":"expression","quote":"Biomass component = λ × exp(p₀ + p₁ × lnD + p₂ × lnH + p₄ × lnCW); p₀ = −2.944, p₁ = 1.935, p₂ = 0.738, p₄ = 0.193, λ = 0.994","locator":"Table 3, model below table and Aboveground biomass, Level 3 row, p. 115"},{"field":"expression","quote":"–2.944      1.935       0.738                  0.193","locator":"Table 3, aboveground biomass, Level 3, 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":"sum of stem-wood over bark and living branches.","locator":"Methods, p. 111"},{"field":"output.excludes","quote":"no leaf biomass","locator":"Methods, p. 111"},{"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":"Crown width (m)","locator":"Fig. 4, p. 114 (rendered page)"},{"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":"0.997      0.076       0.994        6.0","locator":"Table 3, aboveground biomass, Level 3, p. 115"},{"field":"fit.method","quote":"step-wise regression procedure","locator":"Methods, p. 112"}],"check":[{"inputs":{"D":30,"H":20,"CD":6},"expected":486.851358,"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 Lanžhot trees than Table 1 lists. Confirm the height limits before treating them as firm applicability bounds. Crown width is in metres, but its measurement protocol is unspecified; check that your crown-diameter measurements are comparable.","checked_at":"2026-11-05","notes":"The paper's crown width CW is mapped to canonical crown diameter CD. The printed correction factor multiplies the back-transformed prediction. Aboveground biomass comprises stem over bark and living branches; it excludes foliage and dead branches. Level 3 is the authors' best combination of the available predictors; they recommend a single aboveground equation over summing components. Adjusted R² is not stored as unadjusted R²."}