{"id":"darcha-2025-m2-d30","source":{"id":"darcha-2025","citation":"Darcha, G., Birhane, E., Kassa, H., Gebrewahid, Y. (2025). Allometric equations to predict aboveground biomass and carbon stock of Faidherbia albida in parkland agroforestry. Forest Science and Technology, 21(3), 221–232.","title":"Allometric equations to predict aboveground biomass and carbon stock of Faidherbia albida in parkland agroforestry","authors":["Darcha, G.","Birhane, E.","Kassa, H."],"year":2025,"venue":"Forest Science and Technology","doi":"10.1080/21580103.2025.2497246","url":"https://doi.org/10.1080/21580103.2025.2497246","access":"open","license":"CC BY","checked_at":"2026-11-01","status":"current"},"name":"Faidherbia albida in parklands, stump-height diameter (M2)","output":{"quantity":"agb"},"expression":"1.06 * exp(-2.79 + 2.22 * ln(D30))","published":{"expression":"1.06 * exp(-2.79 + 2.22 * ln(DSH))","units":{"DSH":"cm"},"variables":{"DSH":"D30"},"output_unit":"kg"},"taxon":{"level":"species","name":"Faidherbia albida","family":"Fabaceae","group":"broadleaf"},"region":{"scope":"site","countries":["ET"],"place":"Parklands of Kilte Awlaelo, Hawzen and Ganta-Afeshum districts, eastern Tigray, Ethiopia (about 1850-2610 m)","biomes":["tropical","montane","dryland"]},"stand":"agroforestry","fit":{"n_trees":35,"r2":0.86,"cf":1.06,"method":"OLS on ln-transformed data, adjusted R2"},"evidence":[{"field":"expression","quote":"Ln (TAGB) = a0 + a1 ln (DSH) ... −2.79 2.22 ... CF 1.06 ... 0.86","locator":"Table 4, M2"},{"field":"fit","quote":"DSH 8.7–38.8","locator":"Table 3"}],"check":[{"inputs":{"D30":20},"expected":50.34,"origin":"computed","note":"hand-computed from the published form"},{"inputs":{"D30":35},"expected":174.36,"origin":"computed","note":"hand-computed from the published form"}],"verification":"original_read","checked_at":"2026-11-01","notes":"DSH is diameter at stump height, 0.30 m, mapped to D30 (range 8.7-38.8 cm, Table 3)."}