Allometric Models for Estimating Tree Volume and Aboveground Biomass in Lowland Forests of Tanzania

Table 4

Evaluation of the selected general and site specific models for tree total, branches, and stem volume.

Type	Tree section	Selected model	Prediction error%		All	Model efficiency		All
			Dindili	Rondo		Dindili	Rondo
General	Total	7	−2.09	12.78	8.84	0.87	0.96	0.94
		8	−0.50	13.27	6.38	0.90	0.87	0.87
	Branches	7	−17.73	20.95	1.75	0.35	0.65	0.56
		8	−0.26	56.12	27.93	0.66	0.68	0.68
	Stem	7	13.72	15.61	14.66	0.88	0.89	0.88
		8	15.43	14.53	14.98	0.90	0.86	0.86
Selected site specific (Regional)	Total	7	4.08	6.97	—	0.87	0.96	—
		8	6.68	3.28	—	0.90	0.96	—
	Branches	7	15.79	17.46	—	0.58	0.66	—
		8	14.28	18.90	—	0.73	0.86	—
	Stem	7	11.75	15.50	—	0.78	0.90	—
		8	10.28	17.95	—	0.74	0.87	—

The best selected models are in bold and italic.  Significantly different from zero ().