{"id":"adam-2018-mangium-power","source":{"id":"adam-2018","citation":"Adam, N. S., & Jusoh, I. (2018). Allometric model for predicting aboveground biomass and carbon stock of Acacia plantations in Sarawak, Malaysia. BioResources, 13(4), 7381-7394.","title":"Allometric Model for Predicting Aboveground Biomass and Carbon Stock of Acacia Plantations in Sarawak, Malaysia","authors":["Adam, N. S.","Jusoh, I."],"year":2018,"venue":"BioResources","doi":"10.15376/biores.13.4.7381-7394","url":"https://doi.org/10.15376/biores.13.4.7381-7394","read_url":"https://bioresources.cnr.ncsu.edu/wp-content/uploads/2018/08/BioRes_13_4_7381_Adam_Jusoh_Allometric_Model_Biomass_Aboveground_Carbon_Stock_Acacia_14078.pdf","access":"open","checked_at":"2026-11-02","status":"current"},"name":"Acacia mangium (2nd generation) plantation, Sarawak, AGB from D (power)","output":{"quantity":"agb"},"expression":"0.1173 * D^2.454","published":{"expression":"0.1173 * DBH^2.454","units":{"DBH":"cm"},"variables":{"DBH":"D"},"output_unit":"kg"},"taxon":{"level":"species","name":"Acacia mangium","family":"Fabaceae","group":"broadleaf"},"region":{"scope":"site","countries":["MY"],"place":"Daiken Sarawak plantation, Bintulu district, Sarawak","biomes":["tropical"]},"stand":"plantation","fit":{"n_trees":35,"dbh_min_cm":11.6,"dbh_max_cm":41.5,"r2":0.94,"method":"power regression of dry AGB on DBH"},"evidence":[{"field":"expression","quote":"y = 0.1173D2.454","locator":"Table 2, model 2"},{"field":"fit.n_trees","quote":"Thirty five trees of second generation A. mangium","locator":"Field Sampling"},{"field":"fit.dbh_min_cm","quote":"The DBH of felled Acacia hybrid and second generation A. mangium ranged from 12.8 to 40.9 cm and 11.6 to 41.5 cm, respectively","locator":"Results and Discussion, Aboveground Biomass Models"}],"check":[{"inputs":{"D":15},"expected":90.246,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":25},"expected":316.11,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":40},"expected":1001.7,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"About 10-year-old stand. AGB is the sum of stem, branch and leaf dry mass. The paper also prints linear, exponential and logarithmic fits (Table 2) but rejects them (negative predictions for small trees); only the power model, which the authors select, is included."}