{"id":"mwakalukwa-2014-b-spiciformis-dh","source":{"id":"mwakalukwa-2014","citation":"Mwakalukwa, E.E., Meilby, H., Treue, T. (2014). Volume and Aboveground Biomass Models for Dry Miombo Woodland in Tanzania. International Journal of Forestry Research, 2014, 531256.","title":"Volume and Aboveground Biomass Models for Dry Miombo Woodland in Tanzania","authors":["Mwakalukwa, E.E.","Meilby, H.","Treue, T."],"year":2014,"venue":"International Journal of Forestry Research","doi":"10.1155/2014/531256","url":"https://doi.org/10.1155/2014/531256","read_url":"https://onlinelibrary.wiley.com/doi/10.1155/2014/531256","access":"open","checked_at":"2026-11-02","status":"current"},"name":"Dry miombo, total AGB, Brachystegia spiciformis, D and H","output":{"quantity":"agb"},"expression":"1.0081 * exp(-2.6071 + 2.0638 * ln(D) + 0.7847 * ln(H))","published":{"expression":"1.0081 * exp(-2.6071 + 2.0638 * ln(DBH) + 0.7847 * ln(HT))","units":{"DBH":"cm","HT":"m"},"variables":{"DBH":"D","HT":"H"},"output_unit":"kg"},"taxon":{"level":"species","name":"Brachystegia spiciformis","group":"broadleaf"},"region":{"scope":"site","countries":["TZ"],"place":"Gangalamtumba Village Land Forest Reserve, Iringa, Tanzania (dry miombo woodland)","biomes":["tropical","dryland"]},"stand":"natural","fit":{"n_trees":40,"dbh_min_cm":1.2,"dbh_max_cm":54.3,"h_min_m":2,"h_max_m":17.2,"r2":0.998,"cf":1.0081,"method":"OLS on ln-transformed data"},"evidence":[{"field":"expression","quote":"Brachystegia spiciformis (N = 40) ... Total biomass (df = 37) 3 −2.6071 (0.149) 2.0638 (0.078) 0.7847 (0.155) 1.2–54.3 0.998 0.127 1.60","locator":"Table 1, total biomass, model 3"},{"field":"fit.cf","quote":"CF = exp⁡(RMSE2/2), which was applied to the predicted values of volume and biomass","locator":"Section 2.5 (Sprugel correction)"},{"field":"published.units","quote":"Y is volume (m3) or biomass (kg); Dbh is diameter at breast height (cm); ht is total height (m); and wd is wood density (kg m−3).","locator":"Table 1 note"},{"field":"fit.dbh_max_cm","quote":"The minimum and maximum sizes of sample trees/shrubs were 1.4 cm and 62.0 cm in diameter at breast height","locator":"Section 2.2 (study-wide)"}],"check":[{"inputs":{"D":20,"H":10},"expected":219.29,"origin":"computed","note":"hand-computed from the published form"},{"inputs":{"D":40,"H":14},"expected":1193.9,"origin":"computed","note":"hand-computed from the published form"}],"verification":"original_read","checked_at":"2026-11-02","notes":"ln-ln OLS (species models) or linear mixed model with species random effect (group models); total aboveground biomass is stump + stem and branches + twigs and leaves, so foliage is included. The paper states CF = exp(RMSE²/2) and that it was applied to predictions; the CF value (1.0081) is not printed and is computed here from the printed RMSE (0.127) by that stated formula, and applied in both forms. The R² shown for group models is the likelihood-ratio R² named in the Table 2 note; for species models it is adjusted R²."}