{"id":"abdul-hamid-2022-stem-d2h","source":{"id":"abdul-hamid-2022","citation":"Abdul-Hamid, H., Mohamad-Ismail, F.-N., Mohamed, J., et al. (2022). Allometric Equation for Aboveground Biomass Estimation of Mixed Mature Mangrove Forest. Forests, 13(2), 325.","title":"Allometric Equation for Aboveground Biomass Estimation of Mixed Mature Mangrove Forest","authors":["Abdul-Hamid, H.","Mohamad-Ismail, F.-N.","Mohamed, J."],"year":2022,"venue":"Forests","doi":"10.3390/f13020325","url":"https://doi.org/10.3390/f13020325","read_url":"https://www.mdpi.com/1999-4907/13/2/325","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current"},"name":"Mixed mangrove stem biomass, power model (D^2 H)","output":{"quantity":"stem_biomass"},"expression":"0.0355 * (D^2 * H)^0.9778","published":{"expression":"0.0355 * (D^2 * H)^0.9778","units":{"D":"cm","H":"m"},"output_unit":"kg"},"taxon":{"level":"mixed","name":"Seven mangrove species (Bruguiera cylindrica, B. parviflora, B. sexangula, Ceriops tagal, Rhizophora apiculata, R. mucronata, Xylocarpus granatum)","group":"mangrove","members":["Bruguiera cylindrica","Bruguiera parviflora","Bruguiera sexangula","Ceriops tagal","Rhizophora apiculata","Rhizophora mucronata","Xylocarpus granatum"],"members_complete":true},"region":{"scope":"site","countries":["MY"],"place":"Sungai Pulai Forest Reserve, Johor","biomes":["tropical","mangrove"]},"stand":"natural","fit":{"n_trees":15,"dbh_min_cm":9,"dbh_max_cm":33,"r2":0.9579,"method":"power function (intrinsically linear), SPSS general linear model"},"evidence":[{"field":"expression","quote":"(a) M of stem 0.0355D2H0.9778 0.9579","locator":"Table 2"},{"field":"fit.n_trees","quote":"Destructive sampling was conducted using the selective random sampling method on 15 standing trees.","locator":"Abstract"},{"field":"fit.dbh_min_cm","quote":"in the range of DBH from 9.0 cm to 33.0 cm","locator":"Section 3.1"},{"field":"fit.r2","quote":"0.9579","locator":"Table 2"}],"check":[{"inputs":{"D":10,"H":12},"expected":36.396,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":20,"H":19.5},"expected":226.94,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":30,"H":22},"expected":564.3,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Equation form a(D^2 H)^b read from Table 2 (printed 'D2H' with exponent; the paper's equation images were not in the text copy read). Output in kg dry mass. D was measured at about 1.37 m above ground, above the highest stilt root for Rhizophora (Section 2.2). H in the paper is \"stem height\" (Table 2 note; Section 2.3), not total tree height; it is mapped to canonical H here. The paper's best model, Eq. 3 with wood density (0.00475 ρ^0.6309 D^2.28787, R2 0.9697), is not added."}