{"id":"mugasha-2019-h-pines","source":{"id":"mugasha-2019","citation":"Mugasha, W.A., Mauya, E.W., Njana, A.M., et al. (2019). Height-Diameter Allometry for Tree Species in Tanzania Mainland. International Journal of Forestry Research, 2019, 4832849.","title":"Height-Diameter Allometry for Tree Species in Tanzania Mainland","authors":["Mugasha, W.A.","Mauya, E.W.","Njana, A.M."],"year":2019,"venue":"International Journal of Forestry Research","doi":"10.1155/2019/4832849","url":"https://doi.org/10.1155/2019/4832849","read_url":"https://onlinelibrary.wiley.com/doi/10.1155/2019/4832849","access":"open","license":"CC BY 4.0","checked_at":"2026-11-02","status":"current"},"name":"Tanzania Pine species, height from D (base model, Table 4)","output":{"quantity":"height"},"expression":"1.3 + 28.5979 * (1 - exp(-0.0064 * D^1.6174))","published":{"expression":"1.3 + 28.5979 * (1 - exp(-0.0064 * DBH^1.6174))","units":{"DBH":"cm"},"variables":{"DBH":"D"},"output_unit":"m"},"taxon":{"level":"mixed","name":"Mixed tree species, Pine species","group":"conifer"},"region":{"scope":"national","countries":["TZ"],"place":"Tanzania Mainland, NAFORMA inventory (Pine species)","biomes":["tropical"]},"stand":"plantation","fit":{"n_trees":340,"dbh_min_cm":1.8,"dbh_max_cm":54.2,"h_min_m":3,"h_max_m":35,"method":"nonlinear mixed-effects regression (random effect on cluster), Weibull form"},"evidence":[{"field":"expression","quote":"1.3 + 28.5979 × (1 − exp(−0.0064 × D1.6174))","locator":"Table 4, Pine species row"},{"field":"fit.n_trees","quote":"Number of trees 340","locator":"Table 1, H, Pines column"}],"check":[{"inputs":{"D":5},"expected":3.6681,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":20},"expected":17.223,"origin":"computed","note":"computed from the published form (coefficients as printed)"},{"inputs":{"D":50},"expected":29.102,"origin":"computed","note":"computed from the published form (coefficients as printed)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Base model (D only) fitted on NAFORMA data. n_trees and ranges are the Table 1 descriptive statistics for this forest type (the data the model was fitted on). Generalized models with basal area/climate are not captured. Exponent printed flattened in the HTML text (D followed by the exponent); read as D^exponent."}