{"id":"deltell-2024-u-parviflorus-total","source":{"id":"deltell-2024","citation":"Deltell, L., Santana, V.M., Baeza, M.J. (2024). Allometric equations to calculate living and dead fuel loads in Mediterranean species. European Journal of Forest Research, 143, 739-749.","title":"Allometric equations to calculate living and dead fuel loads in Mediterranean species","authors":["Deltell, L.","Santana, V.M.","Baeza, M.J."],"year":2024,"venue":"European Journal of Forest Research","doi":"10.1007/s10342-023-01652-y","url":"https://doi.org/10.1007/s10342-023-01652-y","read_url":"https://link.springer.com/article/10.1007/s10342-023-01652-y","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current"},"name":"Ulex parviflorus total aboveground fuel (biomass) from basal diameter, all development states","output":{"quantity":"agb"},"expression":"exp(4.335) * DRC^2.157 * 1.083 / 1000","published":{"expression":"exp(4.335) * X^2.157 * 1.083","units":{"X":"cm"},"variables":{"X":"DRC"},"output_unit":"g"},"taxon":{"level":"species","name":"Ulex parviflorus","family":"Fabaceae","group":"shrub"},"region":{"scope":"site","countries":["ES"],"place":"Ayora, Valencia Province, eastern Spain (post-fire stands 5-26 years old)","biomes":["temperate","dryland"]},"stand":"natural","fit":{"r2":0.95,"cf":1.083,"method":"log-log regression with Sprugel (1983) correction factor"},"evidence":[{"field":"expression","quote":"Y=((exp(a))×(X^b))×CF","locator":"Table 2 caption"},{"field":"expression","quote":"U. parviflorus | Total fuel | Diameter | 4.335 | 2.157 | 0.950 | 0.399 | 1.083","locator":"Table 2 (columns: species, dependent variable Y, independent variable X, a, b, r2, SEE, CF)"},{"field":"published.units","quote":"we measured four structural variables ... basal stem diameter, height, maximum crown diameter","locator":"Methods, Sampling of species-specific structural variables (measurements in cm)"},{"field":"published.output_unit","quote":"The weight of fuel fractions was measured in grams.","locator":"Methods, Sampling of species-specific structural variables"}],"check":[{"inputs":{"DRC":10},"expected":11.8657,"origin":"computed","note":"hand-computed from the published form"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Total fuel here is all plant biomass of the individual (living plus dead, all size classes), pooled over four post-fire development states (5, 9, 14 and 26 years). X is basal stem diameter in cm (the paper says measured in cm; Table 2 does not repeat the unit) and Y is in grams. Individuals sampled are 10-12 per species per state; per-species n and diameter range are not stated, so left out. Equation is a species-level shrub or small-tree fuel model. The paper writes the fit as 'log Y = log a + b log X' without naming the base, but prints the back-transform as Y = exp(a) × X^b × CF (Table 2 caption), so a is taken as a natural-log intercept as the paper itself does."}